Loans Receivable and Allowance for Credit Losses (Summary of Impaired Loans Receivable by Class) (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	$ 36,099	$ 19,491
Loans with no related allowance, Recorded Investment	31,008	15,952
Loans with no related allowance, Average Recorded Investment	31,565	16,416
Loans with no related allowance, Interest Income Recognized	544	636
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	34,284	58,335
Loans with an allowance recorded, Recorded Investment	32,046	54,689
Loans with an allowance recorded, Average Recorded Investment	35,072	57,721
Loans with an allowance recorded, Interest Income Recognized	464	1,487
Total impaired loans
Unpaid Principal Balance	70,383	77,826
Recorded Investment	63,054	70,641
Related Allowance	3,625	5,067
Average Recorded Investment	66,637	74,137
Interest Income Recognized	1,008	2,123
Mortgage Portfolio Segment
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	24,892	13,478
Loans with no related allowance, Recorded Investment	22,412	10,739
Loans with no related allowance, Average Recorded Investment	22,487	10,910
Loans with no related allowance, Interest Income Recognized	452	533
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	16,297	29,705
Loans with an allowance recorded, Recorded Investment	15,774	29,171
Loans with an allowance recorded, Average Recorded Investment	15,862	29,316
Loans with an allowance recorded, Interest Income Recognized	258	997
Total impaired loans
Unpaid Principal Balance	41,189	43,183
Recorded Investment	38,186	39,910
Related Allowance	1,559	1,580
Average Recorded Investment	38,349	40,226
Interest Income Recognized	710	1,530
Mortgage Portfolio Segment \| Residential
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	10,882	13,478
Loans with no related allowance, Recorded Investment	8,402	10,739
Loans with no related allowance, Average Recorded Investment	8,477	10,910
Loans with no related allowance, Interest Income Recognized	194	533
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	11,482	10,860
Loans with an allowance recorded, Recorded Investment	10,959	10,326
Loans with an allowance recorded, Average Recorded Investment	11,036	10,454
Loans with an allowance recorded, Interest Income Recognized	231	428
Total impaired loans
Unpaid Principal Balance	22,364	24,338
Recorded Investment	19,361	21,065
Related Allowance	888	829
Average Recorded Investment	19,513	21,364
Interest Income Recognized	425	961
Mortgage Portfolio Segment \| Commercial
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	14,010	0
Loans with no related allowance, Recorded Investment	14,010	0
Loans with no related allowance, Average Recorded Investment	14,010	0
Loans with no related allowance, Interest Income Recognized	258	0
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	4,815	18,845
Loans with an allowance recorded, Recorded Investment	4,815	18,845
Loans with an allowance recorded, Average Recorded Investment	4,826	18,862
Loans with an allowance recorded, Interest Income Recognized	27	569
Total impaired loans
Unpaid Principal Balance	18,825	18,845
Recorded Investment	18,825	18,845
Related Allowance	671	751
Average Recorded Investment	18,836	18,862
Interest Income Recognized	285	569
Commercial Loans
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	9,755	3,927
Loans with no related allowance, Recorded Investment	7,649	3,696
Loans with no related allowance, Average Recorded Investment	8,113	4,015
Loans with no related allowance, Interest Income Recognized	66	17
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	17,318	27,762
Loans with an allowance recorded, Recorded Investment	15,614	24,661
Loans with an allowance recorded, Average Recorded Investment	18,545	27,527
Loans with an allowance recorded, Interest Income Recognized	192	444
Total impaired loans
Unpaid Principal Balance	27,073	31,689
Recorded Investment	23,263	28,357
Related Allowance	2,024	3,462
Average Recorded Investment	26,658	31,542
Interest Income Recognized	258	461
Consumer Loans
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	1,452	2,086
Loans with no related allowance, Recorded Investment	947	1,517
Loans with no related allowance, Average Recorded Investment	965	1,491
Loans with no related allowance, Interest Income Recognized	26	86
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	669	868
Loans with an allowance recorded, Recorded Investment	658	857
Loans with an allowance recorded, Average Recorded Investment	665	878
Loans with an allowance recorded, Interest Income Recognized	14	46
Total impaired loans
Unpaid Principal Balance	2,121	2,954
Recorded Investment	1,605	2,374
Related Allowance	42	25
Average Recorded Investment	1,630	2,369
Interest Income Recognized	$ 40	$ 132

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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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