Loans Receivable and Allowance for Credit Losses on Loans (Summary of Impaired Loans Receivable by Class) (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	$ 32,543	$ 19,491
Loans with no related allowance, Recorded Investment	27,630	15,952
Related Allowance	5,699	5,067
Loans with no related allowance, Average Recorded Investment	28,996	16,416
Loans with no related allowance, Interest Income Recognized	281	636
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	41,547	58,335
Loans with an allowance recorded, Recorded Investment	38,102	54,689
Loans with an allowance recorded, Average Recorded Investment	47,976	57,721
Loans with an allowance recorded, Interest Income Recognized	241	1,487
Total impaired loans
Unpaid Principal Balance	74,090	77,826
Recorded Investment	65,732	70,641
Related Allowance	5,699	5,067
Average Recorded Investment	76,972	74,137
Interest Income Recognized	522	2,123
Mortgage Portfolio Segment
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	26,939	13,478
Loans with no related allowance, Recorded Investment	24,367	10,739
Related Allowance	1,590	1,580
Loans with no related allowance, Average Recorded Investment	24,440	10,910
Loans with no related allowance, Interest Income Recognized	246	533
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	15,787	29,705
Loans with an allowance recorded, Recorded Investment	15,225	29,171
Loans with an allowance recorded, Average Recorded Investment	15,264	29,316
Loans with an allowance recorded, Interest Income Recognized	126	997
Total impaired loans
Unpaid Principal Balance	42,726	43,183
Recorded Investment	39,592	39,910
Related Allowance	1,590	1,580
Average Recorded Investment	39,704	40,226
Interest Income Recognized	372	1,530
Mortgage Portfolio Segment \| Residential
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	12,644	13,478
Loans with no related allowance, Recorded Investment	10,187	10,739
Related Allowance	876	829
Loans with no related allowance, Average Recorded Investment	10,257	10,910
Loans with no related allowance, Interest Income Recognized	118	533
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	10,777	10,860
Loans with an allowance recorded, Recorded Investment	10,273	10,326
Loans with an allowance recorded, Average Recorded Investment	10,308	10,454
Loans with an allowance recorded, Interest Income Recognized	112	428
Total impaired loans
Unpaid Principal Balance	23,421	24,338
Recorded Investment	20,460	21,065
Related Allowance	876	829
Average Recorded Investment	20,565	21,364
Interest Income Recognized	230	961
Mortgage Portfolio Segment \| Commercial
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	14,295	0
Loans with no related allowance, Recorded Investment	14,180	0
Related Allowance	694	751
Loans with no related allowance, Average Recorded Investment	14,183	0
Loans with no related allowance, Interest Income Recognized	128	0
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	4,828	18,845
Loans with an allowance recorded, Recorded Investment	4,828	18,845
Loans with an allowance recorded, Average Recorded Investment	4,832	18,862
Loans with an allowance recorded, Interest Income Recognized	14	569
Total impaired loans
Unpaid Principal Balance	19,123	18,845
Recorded Investment	19,008	18,845
Related Allowance	694	751
Average Recorded Investment	19,015	18,862
Interest Income Recognized	142	569
Mortgage Portfolio Segment \| Multi-Family
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	0	0
Loans with no related allowance, Recorded Investment	0	0
Related Allowance	20	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
Loans with an allowance recorded, Unpaid Principal Balance	182	0
Loans with an allowance recorded, Recorded Investment	124	0
Loans with an allowance recorded, Average Recorded Investment	124	0
Loans with an allowance recorded, Interest Income Recognized	0	0
Total impaired loans
Unpaid Principal Balance	182	0
Recorded Investment	124	0
Related Allowance	20	0
Average Recorded Investment	124	0
Interest Income Recognized	0	0
Mortgage Portfolio Segment \| Construction
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	0	0
Loans with no related allowance, Recorded Investment	0	0
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
Loans with an allowance recorded, Unpaid Principal Balance	0	0
Loans with an allowance recorded, Recorded Investment	0	0
Loans with an allowance recorded, Average Recorded Investment	0	0
Loans with an allowance recorded, Interest Income Recognized	0	0
Total impaired loans
Related Allowance	0	0
Commercial Loans
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	3,943	3,927
Loans with no related allowance, Recorded Investment	2,135	3,696
Related Allowance	4,073	3,462
Loans with no related allowance, Average Recorded Investment	3,417	4,015
Loans with no related allowance, Interest Income Recognized	18	17
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	24,763	27,762
Loans with an allowance recorded, Recorded Investment	21,891	24,661
Loans with an allowance recorded, Average Recorded Investment	24,152	27,527
Loans with an allowance recorded, Interest Income Recognized	104	444
Total impaired loans
Unpaid Principal Balance	28,706	31,689
Recorded Investment	24,026	28,357
Related Allowance	4,073	3,462
Average Recorded Investment	27,569	31,542
Interest Income Recognized	122	461
Consumer Loans
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	1,661	2,086
Loans with no related allowance, Recorded Investment	1,128	1,517
Related Allowance	36	25
Loans with no related allowance, Average Recorded Investment	1,139	1,491
Loans with no related allowance, Interest Income Recognized	17	86
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	997	868
Loans with an allowance recorded, Recorded Investment	986	857
Loans with an allowance recorded, Average Recorded Investment	8,560	878
Loans with an allowance recorded, Interest Income Recognized	11	46
Total impaired loans
Unpaid Principal Balance	2,658	2,954
Recorded Investment	2,114	2,374
Related Allowance	36	25
Average Recorded Investment	9,699	2,369
Interest Income Recognized	$ 28	$ 132

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