Loans Receivable and Allowance for Loan Losses - Summary of Impaired Loans Receivable by Class (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	$ 39,054	$ 38,123
Loans with no related allowance, Recorded Investment	31,410	31,809
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	32,152	26,971
Loans with no related allowance, Interest Income Recognized	955	842
Loans with an allowance recorded, Unpaid Principal Balance	22,542	20,930
Loans with an allowance recorded, Recorded Investment	20,631	20,210
Loans with an allowance recorded, Related Allowance	2,690	2,334
Loans with an allowance recorded, Average Recorded Investment	21,893	25,031
Loans with an allowance recorded, Interest Income Recognized	801	644
Total, Unpaid Principal Balance	61,596	59,053
Total, Recorded Investment	52,041	52,019
Total, Related Allowance	2,690	2,334
Total, Average Recorded Investment	54,045	52,002
Total, Interest Income Recognized	1,756	1,486	$ 1,900
Mortgage Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	18,276	14,800
Loans with no related allowance, Recorded Investment	15,385	11,954
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	15,574	12,127
Loans with no related allowance, Interest Income Recognized	491	524
Loans with an allowance recorded, Unpaid Principal Balance	14,116	18,307
Loans with an allowance recorded, Recorded Investment	13,074	17,597
Loans with an allowance recorded, Related Allowance	1,486	1,986
Loans with an allowance recorded, Average Recorded Investment	13,226	17,816
Loans with an allowance recorded, Interest Income Recognized	529	574
Total, Unpaid Principal Balance	32,392	33,107
Total, Recorded Investment	28,459	29,551
Total, Related Allowance	1,486	1,986
Total, Average Recorded Investment	28,800	29,943
Total, Interest Income Recognized	1,020	1,098
Mortgage Portfolio Segment [Member] \| Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	13,239	10,691
Loans with no related allowance, Recorded Investment	10,477	7,881
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	10,552	8,027
Loans with no related allowance, Interest Income Recognized	479	484
Loans with an allowance recorded, Unpaid Principal Balance	13,052	14,169
Loans with an allowance recorded, Recorded Investment	12,010	13,520
Loans with an allowance recorded, Related Allowance	1,351	1,716
Loans with an allowance recorded, Average Recorded Investment	12,150	13,705
Loans with an allowance recorded, Interest Income Recognized	475	519
Total, Unpaid Principal Balance	26,291	24,860
Total, Recorded Investment	22,487	21,401
Total, Related Allowance	1,351	1,716
Total, Average Recorded Investment	22,702	21,732
Total, Interest Income Recognized	954	1,003
Mortgage Portfolio Segment [Member] \| Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	5,037	1,556
Loans with no related allowance, Recorded Investment	4,908	1,556
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	5,022	1,586
Loans with no related allowance, Interest Income Recognized	12	40
Loans with an allowance recorded, Unpaid Principal Balance	1,064	4,138
Loans with an allowance recorded, Recorded Investment	1,064	4,077
Loans with an allowance recorded, Related Allowance	135	270
Loans with an allowance recorded, Average Recorded Investment	1,076	4,111
Loans with an allowance recorded, Interest Income Recognized	54	55
Total, Unpaid Principal Balance	6,101	5,694
Total, Recorded Investment	5,972	5,633
Total, Related Allowance	135	270
Total, Average Recorded Investment	6,098	5,697
Total, Interest Income Recognized	66	95
Mortgage Portfolio Segment [Member] \| Multifamily [Member]
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	0	0
Loans with no related allowance, Recorded Investment	0	0
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	0	0
Loans with no related allowance, Interest Income Recognized	0	0
Loans with an allowance recorded, Unpaid Principal Balance	0	0
Loans with an allowance recorded, Recorded Investment	0	0
Loans with an allowance recorded, Related Allowance	0	0
Loans with an allowance recorded, Average Recorded Investment	0	0
Loans with an allowance recorded, Interest Income Recognized	0	0
Total, Unpaid Principal Balance	0	0
Total, Recorded Investment	0	0
Total, Related Allowance	0	0
Total, Average Recorded Investment	0	0
Total, Interest Income Recognized	0	0
Mortgage Portfolio Segment [Member] \| Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	0	2,553
Loans with no related allowance, Recorded Investment	0	2,517
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	0	2,514
Loans with no related allowance, Interest Income Recognized	0	0
Loans with an allowance recorded, Unpaid Principal Balance	0	0
Loans with an allowance recorded, Recorded Investment	0	0
Loans with an allowance recorded, Related Allowance	0	0
Loans with an allowance recorded, Average Recorded Investment	0	0
Loans with an allowance recorded, Interest Income Recognized	0	0
Total, Unpaid Principal Balance	0	2,553
Total, Recorded Investment	0	2,517
Total, Related Allowance	0	0
Total, Average Recorded Investment	0	2,514
Total, Interest Income Recognized	0	0
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	19,196	21,830
Loans with no related allowance, Recorded Investment	14,984	18,874
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	15,428	13,818
Loans with no related allowance, Interest Income Recognized	395	259
Loans with an allowance recorded, Unpaid Principal Balance	7,097	1,381
Loans with an allowance recorded, Recorded Investment	6,239	1,381
Loans with an allowance recorded, Related Allowance	1,134	268
Loans with an allowance recorded, Average Recorded Investment	7,318	5,956
Loans with an allowance recorded, Interest Income Recognized	208	4
Total, Unpaid Principal Balance	26,293	23,211
Total, Recorded Investment	21,223	20,255
Total, Related Allowance	1,134	268
Total, Average Recorded Investment	22,746	19,774
Total, Interest Income Recognized	603	263
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	1,582	1,493
Loans with no related allowance, Recorded Investment	1,041	981
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	1,150	1,026
Loans with no related allowance, Interest Income Recognized	69	59
Loans with an allowance recorded, Unpaid Principal Balance	1,329	1,242
Loans with an allowance recorded, Recorded Investment	1,318	1,232
Loans with an allowance recorded, Related Allowance	70	80
Loans with an allowance recorded, Average Recorded Investment	1,349	1,259
Loans with an allowance recorded, Interest Income Recognized	64	66
Total, Unpaid Principal Balance	2,911	2,735
Total, Recorded Investment	2,359	2,213
Total, Related Allowance	70	80
Total, Average Recorded Investment	2,499	2,285
Total, Interest Income Recognized	$ 133	$ 125

Impaired Financing Receivable, with No Related Allowance, Related Allowance

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Impaired Financing Receivable, with Related Allowance, Related Allowance

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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