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Loans and Credit Quality - Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | $ 30,866 | $ 23,979 |
Impaired loan, no related allowance, unpaid principal balance | 31,917 | 25,135 |
Impaired loan, related allowance, recorded investment | 848 | 7,988 |
Impaired loan, related allowance, unpaid principal balance | 1,352 | 7,988 |
Related allowance | 14 | 966 |
Recorded investment | 31,714 | 31,967 |
Unpaid principal balance | 33,269 | 33,123 |
Impaired loan, no related allowance, average recorded investment | 32,258 | 28,351 |
Impaired loan, no related allowance, interest income on accrual method | 827 | 976 |
Impaired loan, related allowance, average recorded investment | 2,431 | 8,544 |
Impaired loan, related allowance, interest income on accrual method | 20 | 7 |
Impaired loan, average recorded investment | 34,689 | 36,895 | $ 42,600
Impaired loan, interest income on accrual method | 847 | 983 | $ 2,400
Commercial | Asset Quality Rating - Pass |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 80 |  |
Impaired loan, no related allowance, unpaid principal balance | 80 |  |
Related allowance | 0 |  |
Recorded investment | 80 |  |
Unpaid principal balance | 80 |  |
Impaired loan, no related allowance, average recorded investment | 21 | 0 |
Impaired loan, no related allowance, interest income on accrual method | 2 | 0 |
Impaired loan, average recorded investment | 21 | 0 |
Impaired loan, interest income on accrual method | 2 | 0 |
Commercial | Asset Quality Rating - Special Mention |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 2,009 | 2,153 |
Impaired loan, no related allowance, unpaid principal balance | 2,009 | 2,153 |
Related allowance | 0 | 0 |
Recorded investment | 2,009 | 2,153 |
Unpaid principal balance | 2,009 | 2,153 |
Impaired loan, no related allowance, average recorded investment | 2,146 | 582 |
Impaired loan, no related allowance, interest income on accrual method | 128 | 1 |
Impaired loan, related allowance, average recorded investment | 0 | 525 |
Impaired loan, related allowance, interest income on accrual method | 0 | 3 |
Impaired loan, average recorded investment | 2,146 | 1,107 |
Impaired loan, interest income on accrual method | 128 | 4 |
Commercial | Asset Quality Rating - Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 21,252 | 16,671 |
Impaired loan, no related allowance, unpaid principal balance | 22,303 | 17,742 |
Impaired loan, related allowance, recorded investment | 848 | 7,988 |
Impaired loan, related allowance, unpaid principal balance | 1,352 | 7,988 |
Related allowance | 14 | 966 |
Recorded investment | 22,100 | 24,659 |
Unpaid principal balance | 23,655 | 25,730 |
Impaired loan, no related allowance, average recorded investment | 24,548 | 19,521 |
Impaired loan, no related allowance, interest income on accrual method | 381 | 487 |
Impaired loan, related allowance, average recorded investment | 2,323 | 8,019 |
Impaired loan, related allowance, interest income on accrual method | 20 | 4 |
Impaired loan, average recorded investment | 26,871 | 27,540 |
Impaired loan, interest income on accrual method | 401 | 491 |
Commercial | Asset Quality Rating - Doubtful |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, related allowance, average recorded investment | 14 | 0 |
Impaired loan, related allowance, interest income on accrual method | 0 | 0 |
Impaired loan, average recorded investment | 14 | 0 |
Impaired loan, interest income on accrual method | 0 | 0 |
Real estate term owner occupied | Asset Quality Rating - Pass |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, average recorded investment | 0 | 62 |
Impaired loan, no related allowance, interest income on accrual method | 0 | 5 |
Impaired loan, average recorded investment | 0 | 62 |
Impaired loan, interest income on accrual method | 0 | 5 |
Real estate term owner occupied | Asset Quality Rating - Special Mention |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, average recorded investment | 155 | 0 |
Impaired loan, no related allowance, interest income on accrual method | 0 | 0 |
Impaired loan, average recorded investment | 155 | 0 |
Impaired loan, interest income on accrual method | 0 | 0 |
Real estate term owner occupied | Asset Quality Rating - Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 5,253 | 2,862 |
Impaired loan, no related allowance, unpaid principal balance | 5,253 | 2,862 |
Related allowance | 0 | 0 |
Recorded investment | 5,253 | 2,862 |
Unpaid principal balance | 5,253 | 2,862 |
Impaired loan, no related allowance, average recorded investment | 3,813 | 5,402 |
Impaired loan, no related allowance, interest income on accrual method | 201 | 286 |
Impaired loan, average recorded investment | 3,813 | 5,402 |
Impaired loan, interest income on accrual method | 201 | 286 |
Real estate term non-owner occupied | Asset Quality Rating - Pass |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 295 | 303 |
Impaired loan, no related allowance, unpaid principal balance | 295 | 303 |
Related allowance | 0 | 0 |
Recorded investment | 295 | 303 |
Unpaid principal balance | 295 | 303 |
Impaired loan, no related allowance, average recorded investment | 265 | 354 |
Impaired loan, no related allowance, interest income on accrual method | 24 | 43 |
Impaired loan, average recorded investment | 265 | 354 |
Impaired loan, interest income on accrual method | 24 | 43 |
Real estate term non-owner occupied | Asset Quality Rating - Special Mention |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment |  | 89 |
Impaired loan, no related allowance, unpaid principal balance |  | 89 |
Related allowance |  | 0 |
Recorded investment |  | 89 |
Unpaid principal balance |  | 89 |
Impaired loan, no related allowance, average recorded investment | 22 | 23 |
Impaired loan, no related allowance, interest income on accrual method | 2 | 2 |
Impaired loan, average recorded investment | 22 | 23 |
Impaired loan, interest income on accrual method | 2 | 2 |
Real estate term non-owner occupied | Asset Quality Rating - Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 465 | 482 |
Impaired loan, no related allowance, unpaid principal balance | 465 | 482 |
Related allowance | 0 | 0 |
Recorded investment | 465 | 482 |
Unpaid principal balance | 465 | 482 |
Impaired loan, no related allowance, average recorded investment | 381 | 611 |
Impaired loan, no related allowance, interest income on accrual method | 30 | 45 |
Impaired loan, average recorded investment | 381 | 611 |
Impaired loan, interest income on accrual method | 30 | 45 |
Real estate term other | Asset Quality Rating - Pass |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 486 | 559 |
Impaired loan, no related allowance, unpaid principal balance | 486 | 559 |
Related allowance | 0 | 0 |
Recorded investment | 486 | 559 |
Unpaid principal balance | 486 | 559 |
Impaired loan, no related allowance, average recorded investment | 421 | 595 |
Impaired loan, no related allowance, interest income on accrual method | 36 | 42 |
Impaired loan, average recorded investment | 421 | 595 |
Impaired loan, interest income on accrual method | 36 | 42 |
Real estate term other | Asset Quality Rating - Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 577 |  |
Impaired loan, no related allowance, unpaid principal balance | 577 |  |
Related allowance | 0 |  |
Recorded investment | 577 |  |
Unpaid principal balance | 577 |  |
Impaired loan, no related allowance, average recorded investment | 176 | 487 |
Impaired loan, no related allowance, interest income on accrual method | 0 | 34 |
Impaired loan, average recorded investment | 176 | 487 |
Impaired loan, interest income on accrual method | 0 | 34 |
Consumer secured by 1st deeds of trust | Asset Quality Rating - Pass |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 129 | 136 |
Impaired loan, no related allowance, unpaid principal balance | 129 | 136 |
Related allowance | 0 | 0 |
Recorded investment | 129 | 136 |
Unpaid principal balance | 129 | 136 |
Impaired loan, no related allowance, average recorded investment | 135 | 35 |
Impaired loan, no related allowance, interest income on accrual method | 13 | 3 |
Impaired loan, average recorded investment | 135 | 35 |
Impaired loan, interest income on accrual method | 13 | 3 |
Consumer secured by 1st deeds of trust | Asset Quality Rating - Special Mention |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, average recorded investment | 0 | 105 |
Impaired loan, no related allowance, interest income on accrual method | 0 | 10 |
Impaired loan, average recorded investment | 0 | 105 |
Impaired loan, interest income on accrual method | 0 | 10 |
Consumer secured by 1st deeds of trust | Asset Quality Rating - Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 320 | 724 |
Impaired loan, no related allowance, unpaid principal balance | 320 | 809 |
Related allowance | 0 | 0 |
Recorded investment | 320 | 724 |
Unpaid principal balance | 320 | 809 |
Impaired loan, no related allowance, average recorded investment | 175 | 561 |
Impaired loan, no related allowance, interest income on accrual method | 10 | 17 |
Impaired loan, related allowance, average recorded investment | 94 | 0 |
Impaired loan, related allowance, interest income on accrual method | 0 | 0 |
Impaired loan, average recorded investment | 269 | 561 |
Impaired loan, interest income on accrual method | 10 | 17 |
Consumer other | Asset Quality Rating - Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, average recorded investment | 0 | 13 |
Impaired loan, no related allowance, interest income on accrual method | 0 | 1 |
Impaired loan, average recorded investment | 0 | 13 |
Impaired loan, interest income on accrual method | $ 0 | $ 1 |

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