Loans Receivable and Allowance for Loan Losses - Summary of Allowance for Loan Losses by Portfolio Segment and Impairment Classification (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 8,521		$ 10,217
Collectively evaluated for impairment	55,354		54,447
Total	63,875	63,420	64,664	67,005	70,034	70,348
Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	4,833		7,829
Collectively evaluated for impairment	26,207		26,315
Total	31,040	31,470	34,144	30,670	36,393	37,962
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	3,573		2,221
Collectively evaluated for impairment	23,506		21,886
Total	27,079	25,161	24,107	23,810	23,501	20,315
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	115		167
Collectively evaluated for impairment	4,266		4,762
Total	4,381	4,379	4,929	4,473	4,821	5,224
Total Portfolio Segments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	8,521		10,217
Collectively evaluated for impairment	53,979		52,963
Total	62,500	61,010	63,180	58,953	64,715	63,501
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	1,375		1,484
Total	$ 1,375	$ 2,410	$ 1,484	$ 8,052	$ 5,319	$ 6,847