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Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | $ 7,255 | $ 9,193
New TDRs |  | 1,506
Disbursements (Payments) | (116) | (437)
Payoffs | (435) |
TDR ending balance | 6,704 | 10,262
TDR, Related Allowance | 95 | 286
Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 258 | 1,692
New TDRs |  | 1,506
Disbursements (Payments) | (10) | (380)
TDR ending balance | 248 | 2,818
TDR, Related Allowance |  | 94
Impaired Nonaccrual Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance |  | 1,393
Disbursements (Payments) |  | (26)
TDR ending balance |  | 1,367
TDR, Related Allowance |  | 94
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
New TDRs |  | 1,506
Disbursements (Payments) |  | (344)
TDR ending balance |  | 1,162
Impaired Nonaccrual Loans [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 258 | 299
Disbursements (Payments) | (10) | (10)
TDR ending balance | 248 | 289
Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 6,997 | 7,501
Disbursements (Payments) | (106) | (57)
Payoffs | (435) |
TDR ending balance | 6,456 | 7,444
TDR, Related Allowance | 95 | 192
Impaired Accruing Restructured Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 3,845 | 4,041
Disbursements (Payments) | (29) | (28)
Payoffs | (435) |
TDR ending balance | 3,381 | 4,013
TDR, Related Allowance | 95 | 174
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 3,118 | 3,419
Disbursements (Payments) | (75) | (26)
TDR ending balance | 3,043 | 3,393
TDR, Related Allowance |  | 18
Impaired Accruing Restructured Loans [Member] | Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 34 | 41
Disbursements (Payments) | (2) | (3)
TDR ending balance | $ 32 | $ 38

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