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Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		9 Months Ended						9 Months Ended
	Sep. 30, 2014	Mar. 31, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 FHLB Chicago	Sep. 30, 2014 Residential Loans Held For Investment at Fair Value FHLB Chicago	Sep. 30, 2014 Senior Notes due 2018	Sep. 30, 2014 Long-term Debt Maximum	Dec. 31, 2013 Long-term Debt Maximum	Sep. 30, 2014 Commercial Secured Borrowings	Sep. 30, 2014 Trust Preferred Securities	Sep. 30, 2013 Trust Preferred Securities	Sep. 30, 2014 Subordinated Notes	Sep. 30, 2013 Subordinated Notes
Debt Instrument [Line Items]
Federal home loan bank advances					$ 204,000,000
Weighted average interest rate					0.2524%
Weighted average maturity					8 years 10 months 24 days
Federal home loan bank advances, Maturity period, Rate					91 days
Amount on advances secured by residential mortgage loans						238,326,000
Federal home loan bank stock	4,846,000		4,846,000		4,846,000
Commercial mortgage loans										66,000,000
Convertible notes		287,500,000
Debt Instrument interest rate		4.625%
Debt instrument maturity year		2018
Debt instrument redemption date		Apr. 15, 2018
Interest expense yield	5.49%		5.44%								2.58%	2.65%	2.58%	2.65%
Accrued interest payable	1,610,000		1,610,000	1,000,000			6,000,000
Convertible senior notes conversion rate			41.1320
Debt instrument convertible base principal amount of conversion	1,000		1,000
Convertible senior notes conversion per share	$ 24.31		$ 24.31
Debt instrument face amount											100,000,000		40,000,000
Percentage of yield of debt securities											6.88%	6.90%	6.88%	6.90%
Accrued interest payable balance on long-term debt	$ 10,480,000		$ 10,480,000	$ 6,366,000				$ 1,000,000	$ 1,000,000

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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