Loans Receivable and Allowance for Credit Losses (Summary of Impaired Loans Receivable by Class) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	$ 59,382	$ 48,672
Loans with no related allowance, Recorded Investment	50,270	43,683
Loans with no related allowance, Average Recorded Investment	53,039	40,411
Loans with no related allowance, Interest Income Recognized	148	667
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	33,018	48,455
Loans with an allowance recorded, Recorded Investment	29,277	42,363
Loans with an allowance recorded, Average Recorded Investment	33,387	26,352
Loans with an allowance recorded, Interest Income Recognized	223	1,208
Total impaired loans
Unpaid Principal Balance	92,400	97,127
Recorded Investment	79,547	86,046
Related Allowance	4,802	8,974
Average Recorded Investment	86,426	66,763
Interest Income Recognized	371	1,875
Mortgage Portfolio Segment
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	46,392	31,395
Loans with no related allowance, Recorded Investment	40,450	28,794
Loans with no related allowance, Average Recorded Investment	41,638	27,613
Loans with no related allowance, Interest Income Recognized	135	571
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	9,833	22,943
Loans with an allowance recorded, Recorded Investment	9,333	19,989
Loans with an allowance recorded, Average Recorded Investment	9,386	7,727
Loans with an allowance recorded, Interest Income Recognized	90	877
Total impaired loans
Unpaid Principal Balance	56,225	54,338
Recorded Investment	49,783	48,783
Related Allowance	927	4,220
Average Recorded Investment	51,024	35,340
Interest Income Recognized	225	1,448
Mortgage Portfolio Segment \| Residential
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	12,267	13,981
Loans with no related allowance, Recorded Investment	9,794	11,380
Loans with no related allowance, Average Recorded Investment	10,083	11,587
Loans with no related allowance, Interest Income Recognized	118	511
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	8,938	7,950
Loans with an allowance recorded, Recorded Investment	8,438	7,506
Loans with an allowance recorded, Average Recorded Investment	8,461	7,604
Loans with an allowance recorded, Interest Income Recognized	77	307
Total impaired loans
Unpaid Principal Balance	21,205	21,931
Recorded Investment	18,232	18,886
Related Allowance	904	806
Average Recorded Investment	18,544	19,191
Interest Income Recognized	195	818
Mortgage Portfolio Segment \| Commercial
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	34,125	17,414
Loans with no related allowance, Recorded Investment	30,656	17,414
Loans with no related allowance, Average Recorded Investment	31,555	16,026
Loans with no related allowance, Interest Income Recognized	17	60
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	895	14,993
Loans with an allowance recorded, Recorded Investment	895	12,483
Loans with an allowance recorded, Average Recorded Investment	925	123
Loans with an allowance recorded, Interest Income Recognized	13	570
Total impaired loans
Unpaid Principal Balance	35,020	32,407
Recorded Investment	31,551	29,897
Related Allowance	23	3,414
Average Recorded Investment	32,480	16,149
Interest Income Recognized	30	630
Commercial Loans
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	11,630	15,895
Loans with no related allowance, Recorded Investment	8,963	14,009
Loans with no related allowance, Average Recorded Investment	9,082	12,791
Loans with no related allowance, Interest Income Recognized	0	46
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	22,622	24,947
Loans with an allowance recorded, Recorded Investment	19,396	21,823
Loans with an allowance recorded, Average Recorded Investment	23,451	18,620
Loans with an allowance recorded, Interest Income Recognized	123	311
Total impaired loans
Unpaid Principal Balance	34,252	40,842
Recorded Investment	28,359	35,832
Related Allowance	3,832	4,715
Average Recorded Investment	32,533	31,411
Interest Income Recognized	123	357
Consumer Loans
Loans with no related allowance
Loans with no related allowance, Unpaid Principal Balance	1,360	1,382
Loans with no related allowance, Recorded Investment	857	880
Loans with no related allowance, Average Recorded Investment	2,319	7
Loans with no related allowance, Interest Income Recognized	13	50
Loans with an allowance recorded
Loans with an allowance recorded, Unpaid Principal Balance	563	565
Loans with an allowance recorded, Recorded Investment	548	551
Loans with an allowance recorded, Average Recorded Investment	550	5
Loans with an allowance recorded, Interest Income Recognized	10	20
Total impaired loans
Unpaid Principal Balance	1,923	1,947
Recorded Investment	1,405	1,431
Related Allowance	43	39
Average Recorded Investment	2,869	12
Interest Income Recognized	$ 23	$ 70

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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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