Loans Receivable and Allowance for Loan Losses (Summary of Impaired Loans Receivable by Class) (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 52,383	$ 57,962
Recorded Investment	45,317	50,867
Average Recorded Investment	45,727	51,225
Interest Income Recognized	582	1,949
Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	26,315	27,141
Recorded Investment	22,631	23,152
Related Allowance	1,977	1,901
Average Recorded Investment	22,772	23,579
Interest Income Recognized	492	956
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	4,150	1,240
Recorded Investment	4,088	1,240
Related Allowance	169	185
Average Recorded Investment	4,121	1,361
Interest Income Recognized	24	63
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	2,553	2,358
Recorded Investment	2,517	2,351
Related Allowance	0	0
Average Recorded Investment	2,511	1,170
Interest Income Recognized	0	16
Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	33,018	30,739
Recorded Investment	29,236	26,743
Related Allowance	2,146	2,086
Average Recorded Investment	29,404	26,110
Interest Income Recognized	516	1,035
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	16,568	24,366
Recorded Investment	13,798	21,756
Related Allowance	81	91
Average Recorded Investment	13,999	22,682
Interest Income Recognized	4	799
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,797	2,857
Recorded Investment	2,283	2,368
Related Allowance	86	94
Average Recorded Investment	2,324	2,433
Interest Income Recognized	62	115
Loans With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	34,211	39,816
Impaired financing receivable with no related allowance	28,280
Average Recorded Investment	28,566	33,245
Interest Income Recognized	245	1,262
Loans With No Related Allowance [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	10,781	12,144
Recorded Investment	8,160	8,799
Average Recorded Investment	8,220	9,079
Interest Income Recognized	215	451
Loans With No Related Allowance [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,051	0
Recorded Investment	2,989	0
Average Recorded Investment	3,016	0
Interest Income Recognized	0	0
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	2,553	2,358
Recorded Investment	2,517	2,351
Average Recorded Investment	2,511	1,170
Interest Income Recognized	0	16
Loans With No Related Allowance [Member] | Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	16,385	14,502
Recorded Investment	13,666	11,150
Average Recorded Investment	13,747	10,249
Interest Income Recognized	215	467
Loans With No Related Allowance [Member] | Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	16,299	23,754
Recorded Investment	13,591	21,144
Average Recorded Investment	13,768	21,875
Interest Income Recognized	0	747
Loans With No Related Allowance [Member] | Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,527	1,560
Recorded Investment	1,023	1,082
Average Recorded Investment	1,051	1,121
Interest Income Recognized	30	48
Loans With Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	18,172	18,146
Recorded Investment	17,037	17,491
Related Allowance	2,313	2,271
Average Recorded Investment	17,161	17,980
Interest Income Recognized	337	687
Loans With Allowance Recorded [Member] | Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	15,534	14,997
Recorded Investment	14,471	14,353
Related Allowance	1,977	1,901
Average Recorded Investment	14,552	14,500
Interest Income Recognized	277	505
Loans With Allowance Recorded [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,099	1,240
Recorded Investment	1,099	1,240
Related Allowance	169	185
Average Recorded Investment	1,105	1,361
Interest Income Recognized	24	63
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	0
Recorded Investment	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Loans With Allowance Recorded [Member] | Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	16,633	16,237
Recorded Investment	15,570	15,593
Related Allowance	2,146	2,086
Average Recorded Investment	15,657	15,861
Interest Income Recognized	301	568
Loans With Allowance Recorded [Member] | Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	269	612
Recorded Investment	207	612
Related Allowance	81	91
Average Recorded Investment	231	807
Interest Income Recognized	4	52
Loans With Allowance Recorded [Member] | Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,270	1,297
Recorded Investment	1,260	1,286
Related Allowance	86	94
Average Recorded Investment	1,273	1,312
Interest Income Recognized	$ 32	$ 67