Loans (Residential, Home Equity and Consumer Loans Based on Payment Activity) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 3,074,523	$ 3,091,998		$ 3,081,973
Consumer Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	20,200	33,857
Fiscal Year Before Current Fiscal Year	25,296	16,486
Two Years Before Current Fiscal Year	6,835	8,467
Three Years Before Current Fiscal Year	6,008	2,117
Four Years Before Current Fiscal Year	1,170	924
Prior	2,222	2,268
Revolving Loans Amortized Cost Basis	2,327	2,598
Total	64,058	66,717	$ 69,264	81,217
Consumer Loans \| Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	20,200	33,857
Fiscal Year Before Current Fiscal Year	25,296	16,486
Two Years Before Current Fiscal Year	6,835	8,456
Three Years Before Current Fiscal Year	6,001	2,115
Four Years Before Current Fiscal Year	1,169	910
Prior	2,204	2,245
Revolving Loans Amortized Cost Basis	2,327	2,563
Total	64,032	66,632
Consumer Loans \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year Before Current Fiscal Year	0	0
Two Years Before Current Fiscal Year	0	11
Three Years Before Current Fiscal Year	7	2
Four Years Before Current Fiscal Year	1	14
Prior	18	23
Revolving Loans Amortized Cost Basis	0	35
Total	26	85
Home Equity Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year Before Current Fiscal Year	28	0
Two Years Before Current Fiscal Year	0	34
Three Years Before Current Fiscal Year	21	46
Four Years Before Current Fiscal Year	45	67
Prior	475	490
Revolving Loans Amortized Cost Basis	212,727	218,711
Total	213,296	219,348	225,790	225,755
Home Equity Loans \| Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year Before Current Fiscal Year	28	0
Two Years Before Current Fiscal Year	0	34
Three Years Before Current Fiscal Year	21	46
Four Years Before Current Fiscal Year	45	67
Prior	475	490
Revolving Loans Amortized Cost Basis	212,545	218,440
Total	213,114	219,077
Home Equity Loans \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year Before Current Fiscal Year	0	0
Two Years Before Current Fiscal Year	0	0
Three Years Before Current Fiscal Year	0	0
Four Years Before Current Fiscal Year	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	182	271
Total	182	271
Residential Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	63,028	45,945
Fiscal Year Before Current Fiscal Year	44,093	26,536
Two Years Before Current Fiscal Year	18,237	28,050
Three Years Before Current Fiscal Year	20,319	28,764
Four Years Before Current Fiscal Year	23,357	25,155
Prior	105,059	101,826
Revolving Loans Amortized Cost Basis	0	0
Total	274,093	256,276	$ 305,002	$ 304,855
Residential Mortgage Loans \| Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	63,028	45,945
Fiscal Year Before Current Fiscal Year	44,093	26,536
Two Years Before Current Fiscal Year	18,237	28,050
Three Years Before Current Fiscal Year	20,319	28,764
Four Years Before Current Fiscal Year	23,357	25,155
Prior	104,071	100,998
Revolving Loans Amortized Cost Basis	0	0
Total	273,105	255,448
Residential Mortgage Loans \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current Fiscal Year	0	0
Fiscal Year Before Current Fiscal Year	0	0
Two Years Before Current Fiscal Year	0	0
Three Years Before Current Fiscal Year	0	0
Four Years Before Current Fiscal Year	0	0
Prior	988	828
Revolving Loans Amortized Cost Basis	0	0
Total	$ 988	$ 828

Amount, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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