Loans - Investment in Loans by Portfolio Segment and Based on Impairment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning balance	$ 21,130	$ 42,271	$ 50,883
Provision	4,116	39,325	24,658
Charge-offs	(8,627)	(24,268)	(35,739)
Recoveries	4,497	1,960	2,469
Net (charge-offs) recovery from asset sale		(38,158)
Allowance, Ending balance	21,116	21,130	42,271
Loans individually evaluated for impairment	3,325	3,024	11,823
Loans collectively evaluated for impairment	17,791	18,106	30,448
Allowance, Ending balance	21,116	21,130	42,271
Loans individually evaluated for impairment	48,181	61,017	153,567
Loans collectively evaluated for impairment	1,000,984	1,025,139	1,266,629
Ending balance	1,049,165	1,086,156	1,420,196
Permanent Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning balance	13,819	31,323	28,066
Provision	4,977	34,260	17,073
Charge-offs	(5,937)	(16,790)	(14,734)
Recoveries	935	770	918
Net (charge-offs) recovery from asset sale		(35,744)
Allowance, Ending balance	13,794	13,819	31,323
Loans individually evaluated for impairment	1,786	2,380	8,275
Loans collectively evaluated for impairment	12,008	11,439	23,048
Allowance, Ending balance	13,794	13,819	31,323
Loans individually evaluated for impairment	27,224	43,013	115,290
Loans collectively evaluated for impairment	753,220	769,155	972,496
Ending balance	780,444	812,168	1,087,786
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning balance	1,404	4,493	8,533
Provision	(783)	2,310	8,126
Charge-offs	(641)	(3,480)	(12,504)
Recoveries	2,301	215	338
Net (charge-offs) recovery from asset sale		(2,134)
Allowance, Ending balance	2,281	1,404	4,493
Loans individually evaluated for impairment	680	478	3,102
Loans collectively evaluated for impairment	1,601	926	1,391
Allowance, Ending balance	2,281	1,404	4,493
Loans individually evaluated for impairment	3,092	7,547	30,587
Loans collectively evaluated for impairment	50,257	25,305	33,280
Ending balance	53,349	32,852	63,867
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning balance	4,459	4,576	5,260
Provision	1,009	2,721	2,171
Charge-offs	(1,883)	(2,740)	(3,446)
Recoveries	717	724	591
Net (charge-offs) recovery from asset sale		(822)
Allowance, Ending balance	4,302	4,459	4,576
Loans individually evaluated for impairment	859		236
Loans collectively evaluated for impairment	3,443	4,459	4,340
Allowance, Ending balance	4,302	4,459	4,576
Loans individually evaluated for impairment	13,821	8,784	3,734
Loans collectively evaluated for impairment	175,410	205,809	234,663
Ending balance	189,231	214,593	238,397
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning balance	1,448	1,879	9,024
Provision	(1,087)	34	(2,712)
Charge-offs	(166)	(1,258)	(5,055)
Recoveries	544	251	622
Net (charge-offs) recovery from asset sale		542
Allowance, Ending balance	739	1,448	1,879
Loans individually evaluated for impairment		166	210
Loans collectively evaluated for impairment	739	1,282	1,669
Allowance, Ending balance	739	1,448	1,879
Loans individually evaluated for impairment	4,044	1,673	3,956
Loans collectively evaluated for impairment	22,097	24,870	26,190
Ending balance	$ 26,141	$ 26,543	$ 30,146