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Loans and Allowance for Credit Losses (Aging of Past Due Financing Receivables) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | $ 2,284 | $ 3,040
Nonaccrual | 4,880 | 5,455
Total loans | $ 1,461,522 | $ 1,454,256
Percent of total loans, Total past due | 0.20% | 0.30%
Percent of total loans, Nonaccrual | 0.30% | 0.40%
Percent of total loans, Total loans | 100.00% | 100.00%
Current [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | $ 1,454,358 | $ 1,445,761
Percent of total loans, Current | 99.50% | 99.30%
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | $ 1,058 | $ 1,229
Percent of total loans, Total past due | 0.10% | 0.10%
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | $ 38 | $ 1,007
Percent of total loans, Total past due |  | 0.10%
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | $ 1,188 | $ 804
Percent of total loans, Total past due | 0.10% | 0.10%
Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | $ 1,221 | $ 1,747
Nonaccrual | 1,222 | 1,585
Total loans | 449,651 | 443,542
Residential Portfolio Segment [Member] | Current [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 447,208 | 440,210
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 505 | 517
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 38 | 938
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 678 | 292
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 873 | 879
Nonaccrual | 3,085 | 3,287
Total loans | 641,155 | 661,232
Commercial Real Estate Portfolio Segment [Member] | Current [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 637,197 | 657,066
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 363 | 367
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 510 | 512
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 143 | 294
Nonaccrual | 248 | 258
Total loans | 218,923 | 211,256
Commercial Portfolio Segment [Member] | Current [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 218,532 | 210,704
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 143 | 226
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due |  | 68
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 15 | 120
Nonaccrual | 28 | 28
Total loans | 35,822 | 31,466
Consumer Portfolio Segment [Member] | Current [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 35,779 | 31,318
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 15 | 119
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due |  | 1
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 32 |
Nonaccrual | 297 | 297
Total loans | 115,971 | 106,760
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Current [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 115,642 | $ 106,463
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | $ 32 |

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