Loans Receivable and Allowance for Loan Losses - Summary of Impaired Loans Receivable by Class (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 102,494	$ 116,056
Recorded Investment	93,839	106,370
Related Allowance	8,521	10,217
Average Recorded Investment	96,462	111,008
Interest Income Recognized	1,221	2,598
Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	30,128	30,581
Recorded Investment	25,741	26,472
Related Allowance	2,293	2,571
Average Recorded Investment	27,227	26,932
Interest Income Recognized	452	856
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	42,878	42,237
Recorded Investment	41,370	40,918
Related Allowance	2,540	2,309
Average Recorded Investment	41,573	41,561
Interest Income Recognized	484	979
Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	9,810
Recorded Investment	0	8,449
Related Allowance	0	2,949
Average Recorded Investment	0	8,659
Interest Income Recognized	0	0
Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	73,006	82,628
Recorded Investment	67,111	75,839
Related Allowance	4,833	7,829
Average Recorded Investment	68,800	77,152
Interest Income Recognized	936	1,835
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	27,051	30,942
Recorded Investment	24,457	28,210
Related Allowance	3,573	2,221
Average Recorded Investment	25,397	31,456
Interest Income Recognized	228	674
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,437	2,486
Recorded Investment	2,271	2,321
Related Allowance	115	167
Average Recorded Investment	2,265	2,400
Interest Income Recognized	57	89
Loans With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	25,295	27,293
Recorded Investment	20,108	21,958
Average Recorded Investment	21,752	24,082
Interest Income Recognized	201	352
Loans With No Related Allowance [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	14,219	13,459
Recorded Investment	10,442	9,999
Average Recorded Investment	11,845	10,322
Interest Income Recognized	172	299
Loans With No Related Allowance [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	5,079	4,917
Recorded Investment	4,847	4,667
Average Recorded Investment	4,851	4,834
Interest Income Recognized	8	3
Loans With No Related Allowance [Member] | Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Loans With No Related Allowance [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Loans With No Related Allowance [Member] | Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	19,298	18,376
Recorded Investment	15,289	14,666
Average Recorded Investment	16,696	15,156
Interest Income Recognized	180	302
Loans With No Related Allowance [Member] | Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	4,994	8,163
Recorded Investment	3,971	6,674
Average Recorded Investment	4,224	8,252
Interest Income Recognized	0	24
Loans With No Related Allowance [Member] | Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,003	754
Recorded Investment	848	618
Average Recorded Investment	832	674
Interest Income Recognized	21	26
Loans With Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	77,199	88,763
Recorded Investment	73,731	84,412
Related Allowance	8,521	10,217
Average Recorded Investment	74,710	86,926
Interest Income Recognized	1,020	2,246
Loans With Allowance Recorded [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	15,909	17,122
Recorded Investment	15,299	16,473
Related Allowance	2,293	2,571
Average Recorded Investment	15,382	16,610
Interest Income Recognized	280	557
Loans With Allowance Recorded [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	37,799	37,320
Recorded Investment	36,523	36,251
Related Allowance	2,540	2,309
Average Recorded Investment	36,722	36,727
Interest Income Recognized	476	976
Loans With Allowance Recorded [Member] | Multi-Family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Loans With Allowance Recorded [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	9,810
Recorded Investment	0	8,449
Related Allowance	0	2,949
Average Recorded Investment	0	8,659
Interest Income Recognized	0	0
Loans With Allowance Recorded [Member] | Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	53,708	64,252
Recorded Investment	51,822	61,173
Related Allowance	4,833	7,829
Average Recorded Investment	52,104	61,996
Interest Income Recognized	756	1,533
Loans With Allowance Recorded [Member] | Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	22,057	22,779
Recorded Investment	20,486	21,536
Related Allowance	3,573	2,221
Average Recorded Investment	21,173	23,204
Interest Income Recognized	228	650
Loans With Allowance Recorded [Member] | Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,434	1,732
Recorded Investment	1,423	1,703
Related Allowance	115	167
Average Recorded Investment	1,433	1,726
Interest Income Recognized	$ 36	$ 63