Loans Receivable and Allowance for Loan Losses - Summary of Impaired Loans Receivable by Class (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	$ 19,491	$ 40,180
Loans with no related allowance, Recorded Investment	15,952	31,118
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	16,416	32,156
Loans with no related allowance, Interest Income Recognized	636	1,012
Loans with an allowance recorded, Unpaid Principal Balance	58,335	20,059
Loans with an allowance recorded, Recorded Investment	54,689	19,566
Loans with an allowance recorded, Related Allowance	5,067	1,165
Loans with an allowance recorded, Average Recorded Investment	57,721	21,712
Loans with an allowance recorded, Interest Income Recognized	1,487	953
Total, Unpaid Principal Balance	77,826	60,239
Total, Recorded Investment	70,641	50,684
Total, Related Allowance	5,067	1,165
Total, Average Recorded Investment	74,137	53,868
Total, Interest Income Recognized	2,123	1,965	$ 1,800
Mortgage Portfolio Segment
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	13,478	16,563
Loans with no related allowance, Recorded Investment	10,739	13,551
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	10,910	13,687
Loans with no related allowance, Interest Income Recognized	533	594
Loans with an allowance recorded, Unpaid Principal Balance	29,705	11,612
Loans with an allowance recorded, Recorded Investment	29,171	11,129
Loans with an allowance recorded, Related Allowance	1,580	1,026
Loans with an allowance recorded, Average Recorded Investment	29,316	11,238
Loans with an allowance recorded, Interest Income Recognized	997	478
Total, Unpaid Principal Balance	43,183	28,175
Total, Recorded Investment	39,910	24,680
Total, Related Allowance	1,580	1,026
Total, Average Recorded Investment	40,226	24,925
Total, Interest Income Recognized	1,530	1,072
Mortgage Portfolio Segment \| Residential Real Estate
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	13,478	15,013
Loans with no related allowance, Recorded Investment	10,739	12,005
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	10,910	12,141
Loans with no related allowance, Interest Income Recognized	533	594
Loans with an allowance recorded, Unpaid Principal Balance	10,860	10,573
Loans with an allowance recorded, Recorded Investment	10,326	10,090
Loans with an allowance recorded, Related Allowance	829	954
Loans with an allowance recorded, Average Recorded Investment	10,454	10,186
Loans with an allowance recorded, Interest Income Recognized	428	425
Total, Unpaid Principal Balance	24,338	25,586
Total, Recorded Investment	21,065	22,095
Total, Related Allowance	829	954
Total, Average Recorded Investment	21,364	22,327
Total, Interest Income Recognized	961	1,019
Mortgage Portfolio Segment \| Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	0	1,550
Loans with no related allowance, Recorded Investment	0	1,546
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	0	1,546
Loans with no related allowance, Interest Income Recognized	0	0
Loans with an allowance recorded, Unpaid Principal Balance	18,845	1,039
Loans with an allowance recorded, Recorded Investment	18,845	1,039
Loans with an allowance recorded, Related Allowance	751	72
Loans with an allowance recorded, Average Recorded Investment	18,862	1,052
Loans with an allowance recorded, Interest Income Recognized	569	53
Total, Unpaid Principal Balance	18,845	2,589
Total, Recorded Investment	18,845	2,585
Total, Related Allowance	751	72
Total, Average Recorded Investment	18,862	2,598
Total, Interest Income Recognized	569	53
Mortgage Portfolio Segment \| Multifamily
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 \| Construction Loans
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
Commercial Portfolio Segment
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	3,927	21,746
Loans with no related allowance, Recorded Investment	3,696	16,254
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	4,015	17,083
Loans with no related allowance, Interest Income Recognized	17	328
Loans with an allowance recorded, Unpaid Principal Balance	27,762	7,493
Loans with an allowance recorded, Recorded Investment	24,661	7,493
Loans with an allowance recorded, Related Allowance	3,462	92
Loans with an allowance recorded, Average Recorded Investment	27,527	9,512
Loans with an allowance recorded, Interest Income Recognized	444	435
Total, Unpaid Principal Balance	31,689	29,239
Total, Recorded Investment	28,357	23,747
Total, Related Allowance	3,462	92
Total, Average Recorded Investment	31,542	26,595
Total, Interest Income Recognized	461	763
Consumer Portfolio Segment
Financing Receivable, Impaired [Line Items]
Loans with no related allowance, Unpaid Principal Balance	2,086	1,871
Loans with no related allowance, Recorded Investment	1,517	1,313
Loans with no related allowance, Related Allowance	0	0
Loans with no related allowance, Average Recorded Investment	1,491	1,386
Loans with no related allowance, Interest Income Recognized	86	90
Loans with an allowance recorded, Unpaid Principal Balance	868	954
Loans with an allowance recorded, Recorded Investment	857	944
Loans with an allowance recorded, Related Allowance	25	47
Loans with an allowance recorded, Average Recorded Investment	878	962
Loans with an allowance recorded, Interest Income Recognized	46	40
Total, Unpaid Principal Balance	2,954	2,825
Total, Recorded Investment	2,374	2,257
Total, Related Allowance	25	47
Total, Average Recorded Investment	2,369	2,348
Total, Interest Income Recognized	$ 132	$ 130

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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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