Quarterly report pursuant to Section 13 or 15(d)

Notes Payable - Narrative (Details)

Notes Payable - Narrative (Details) - USD ($)								1 Months Ended		3 Months Ended		12 Months Ended
Notes Payable - Narrative (Details) - USD ($)	Mar. 06, 2019	Dec. 24, 2018	Aug. 09, 2018	Jun. 22, 2018	May 22, 2018	Dec. 12, 2017	Nov. 21, 2017	Jun. 30, 2018	Feb. 28, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Feb. 06, 2019	Nov. 15, 2018	Nov. 01, 2018	Aug. 31, 2018
Line of Credit Facility [Line Items]
Notes payable, debt issuance costs										$ 6,801,000		$ 7,086,000
Commissions										166,929,000	$ 163,286,000
Long-term debt										$ 261,237,000		254,072,000
6.5% Senior notes \| Senior Notes
Line of Credit Facility [Line Items]
Face amount of debt						$ 76,569,000	$ 72,500,000
Interest rate							6.50%			6.50%
Redemption percentage							100.00%
Option to exercise amount						4,069,000
Notes payable, debt issuance costs						3,313,000
Commissions						$ 1,187,000
Debt sold									$ 25,000,000			$ 6,240,000
Commissions receivable, percentage									2.00%
7% Senior Notes \| Senior Notes
Line of Credit Facility [Line Items]
Face amount of debt				$ 41,412,000	$ 40,000,000
Interest rate					7.00%					7.00%		7.00%
Redemption percentage					100.00%
Option to exercise amount				1,412,000
Notes payable, debt issuance costs				2,020,000
Commissions				$ 464,000
Debt sold								$ 25,000,000				$ 2,729,000
Commissions receivable, percentage					2.00%
Long-term debt												1,622,000
7.25% Senior Notes \| Senior Notes
Line of Credit Facility [Line Items]
Face amount of debt			$ 60,000,000
Interest rate			7.25%							7.25%
Redemption percentage			100.00%
Notes payable, debt issuance costs			$ 2,135,000
Commissions			120,000
Proceeds from issuance of debt			$ 60,000,000
Notes payable to Kestler Financial Group's former shareholders \| Notes Payable \| Kestler Financial Group
Line of Credit Facility [Line Items]
Face amount of debt																$ 5,450,000
Interest rate																4.00%
Notes payable to Four Seasons Financial Group's former shareholders \| Notes Payable \| Four Seasons Financial Group
Line of Credit Facility [Line Items]
Face amount of debt															$ 372,000
Interest rate														4.75%	3.99%
Bank Term Loan \| Securities America \| Term Loan
Line of Credit Facility [Line Items]
Face amount of debt													$ 7,000,000
Interest rate													5.52%
Interest expense on note										$ 35,000
Long-term debt										6,823,000
Monthly payments	$ 212,000
Management and board of directors \| 6.5% Senior notes \| Senior Notes
Line of Credit Facility [Line Items]
Notes purchased by directors							$ 10,400,000
Fair Value \| Level 2
Line of Credit Facility [Line Items]
Notes payable, net										$ 276,465,000		$ 266,844,000
Repurchase Agreement \| 7.25% Senior Notes \| Senior Notes
Line of Credit Facility [Line Items]
Face amount of debt		$ 76,350,000
Interest rate		7.25%
Repurchase Agreement \| Notes Payable to Frost former shareholders \| Notes Payable
Line of Credit Facility [Line Items]
Interest rate												7.25%
Redemption percentage										100.00%
Shares authorized for repurchase (in shares) (up to)		50,900,000
Share price (in USD per share)		$ 2.50
Cash used in transaction		$ 50,900,000
Shares of common stock canceled (in shares)		3,610,000
Cash exchanged for cancellation		$ 3,000,000