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	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 7,130	$ 10,217
Collectively evaluated for impairment	56,290	54,447
Total	63,420	64,664	70,034	70,348
Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	4,763	7,829
Collectively evaluated for impairment	26,707	26,315
Total	31,470	34,144	36,393	37,962
Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	2,248	2,221
Collectively evaluated for impairment	22,913	21,886
Total	25,161	24,107	23,501	20,315
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	119	167
Collectively evaluated for impairment	4,260	4,762
Total	4,379	4,929	4,821	5,224
Total Portfolio Segments [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	7,130	10,217
Collectively evaluated for impairment	53,880	52,963
Total	61,010	63,180	64,715	63,501
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2,410	1,484
Total	$ 2,410	$ 1,484	$ 5,319	$ 6,847