Loans - Investment in Loans by Portfolio Segment and Based on Impairment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Jan. 11, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning balance	$ 21,116			$ 21,130
Provision	33	2,064
Chargeoffs	(1,164)	(2,160)
Recoveries	569	793
Allowance, Ending balance	20,554	21,827		21,130
Loans individually evaluated for impairment	4,340	3,436	3,325
Loans collectively evaluated for impairment	16,214		17,791
Allowance, Ending balance	20,554		21,116
Loans individually evaluated for impairment	48,084	60,613	48,181
Loans collectively evaluated for impairment	1,032,364		1,000,984
Ending balance	1,080,448	1,080,448	1,049,165
Permanent Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning balance	13,794			13,819
Provision	252	2,029
Chargeoffs	(612)	(1,206)
Recoveries	192	265
Allowance, Ending balance	13,626	14,907		13,819
Loans individually evaluated for impairment	2,520	3,108	1,786
Loans collectively evaluated for impairment	10,869		12,008
Allowance, Ending balance	13,389		13,794
Loans individually evaluated for impairment	27,667		27,224
Loans collectively evaluated for impairment	773,070		753,220
Ending balance	800,737		780,444
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning balance	2,281			1,404
Provision	(175)	(18)
Chargeoffs	(100)	(226)
Recoveries	21	283
Allowance, Ending balance	2,027	1,443		1,404
Loans individually evaluated for impairment	677	318	680
Loans collectively evaluated for impairment	1,515		1,601
Allowance, Ending balance	2,192		2,281
Loans individually evaluated for impairment	2,882		3,092
Loans collectively evaluated for impairment	52,407		50,257
Ending balance	55,289		53,349
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning balance	4,302			4,459
Provision	(174)	238
Chargeoffs	(407)	(600)
Recoveries	174	157
Allowance, Ending balance	3,895	4,254		4,459
Loans individually evaluated for impairment	1,140		859
Loans collectively evaluated for impairment	2,802		3,443
Allowance, Ending balance	3,942		4,302
Loans individually evaluated for impairment	13,500		13,821
Loans collectively evaluated for impairment	170,909		175,410
Ending balance	184,409		189,231
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance, Beginning balance	739			1,448
Provision	130	(185)
Chargeoffs	(45)	(128)
Recoveries	182	88
Allowance, Ending balance	1,006	1,223		1,448
Loans individually evaluated for impairment	3
Loans collectively evaluated for impairment	1,028		739
Allowance, Ending balance	1,031		739
Loans individually evaluated for impairment	4,035		4,044
Loans collectively evaluated for impairment	35,978		22,097
Ending balance	$ 40,013		$ 26,141