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Loans and Credit Quality - Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | $ 25,871 |  | $ 23,979
Impaired loan, no related allowance, unpaid principal balance | 27,906 |  | 25,135
Impaired loan, related allowance, recorded investment | 7,368 |  | 7,988
Impaired loan, related allowance, unpaid principal balance | 7,421 |  | 7,988
Related allowance | 372 |  | 966
Recorded investment | 33,239 |  | 31,967
Unpaid principal balance | 35,327 |  | 33,123
Impaired loan, no related allowance, average recorded investment | 27,185 | $ 26,187 |
Impaired loan, no related allowance, interest income recognized | 171 | 229 |
Impaired loan, related allowance, average recorded investment | 7,502 | 11,285 |
Impaired loan, related allowance, interest income recognized | 0 | 0 |
Average recorded investment | 34,687 | 37,472 |
Interest income recognized | 171 | 229 |
Commercial | AQR Special Mention |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 2,233 |  | 2,153
Impaired loan, no related allowance, unpaid principal balance | 2,233 |  | 2,153
Recorded investment | 2,233 |  | 2,153
Unpaid principal balance | 2,233 |  | 2,153
Impaired loan, no related allowance, average recorded investment | 2,242 | 52 |
Impaired loan, no related allowance, interest income recognized | 31 | 1 |
Average recorded investment | 2,242 | 52 |
Interest income recognized | 31 | 1 |
Commercial | AQR Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 17,271 |  | 16,671
Impaired loan, no related allowance, unpaid principal balance | 19,306 |  | 17,742
Impaired loan, related allowance, recorded investment | 7,073 |  | 7,988
Impaired loan, related allowance, unpaid principal balance | 7,073 |  | 7,988
Related allowance | 316 |  | 966
Recorded investment | 24,344 |  | 24,659
Unpaid principal balance | 26,379 |  | 25,730
Impaired loan, no related allowance, average recorded investment | 18,549 | 17,544 |
Impaired loan, no related allowance, interest income recognized | 85 | 76 |
Impaired loan, related allowance, average recorded investment | 7,205 | 11,285 |
Impaired loan, related allowance, interest income recognized | 0 | 0 |
Average recorded investment | 25,754 | 28,829 |
Interest income recognized | 85 | 76 |
Commercial | AQR Doubtful |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, related allowance, recorded investment | 54 |  |
Impaired loan, related allowance, unpaid principal balance | 54 |  |
Related allowance | 54 |  |
Recorded investment | 54 |  |
Unpaid principal balance | 54 |  |
Impaired loan, related allowance, average recorded investment | 55 | 0 |
Impaired loan, related allowance, interest income recognized | 0 | 0 |
Real estate construction one-to-four family | AQR Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average recorded investment | 0 | 0 |
Interest income recognized | 0 | 0 |
Real estate construction other | AQR Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average recorded investment | 0 | 0 |
Interest income recognized | 0 | 0 |
Real estate term owner occupied | AQR Pass |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, average recorded investment | 0 | 250 |
Impaired loan, no related allowance, interest income recognized | 0 | 5 |
Average recorded investment | 0 | 250 |
Interest income recognized | 0 | 5 |
Real estate term owner occupied | AQR Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 4,584 |  | 2,862
Impaired loan, no related allowance, unpaid principal balance | 4,584 |  | 2,862
Recorded investment | 4,584 |  | 2,862
Unpaid principal balance | 4,584 |  | 2,862
Impaired loan, no related allowance, average recorded investment | 4,592 | 5,325 |
Impaired loan, no related allowance, interest income recognized | 24 | 84 |
Average recorded investment | 4,592 | 5,325 |
Interest income recognized | 24 | 84 |
Real estate term non-owner occupied | AQR 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
Recorded investment | 295 |  | 303
Unpaid principal balance | 295 |  | 303
Impaired loan, no related allowance, average recorded investment | 299 | 384 |
Impaired loan, no related allowance, interest income recognized | 5 | 14 |
Average recorded investment | 299 | 384 |
Interest income recognized | 5 | 14 |
Real estate term non-owner occupied | AQR Special Mention |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 89 |  | 89
Impaired loan, no related allowance, unpaid principal balance | 89 |  | 89
Recorded investment | 89 |  | 89
Unpaid principal balance | 89 |  | 89
Real estate term non-owner occupied | AQR Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 477 |  | 482
Impaired loan, no related allowance, unpaid principal balance | 477 |  | 482
Recorded investment | 477 |  | 482
Unpaid principal balance | 477 |  | 482
Impaired loan, no related allowance, average recorded investment | 480 | 696 |
Impaired loan, no related allowance, interest income recognized | 7 | 20 |
Average recorded investment | 480 | 696 |
Interest income recognized | 7 | 20 |
Real estate term other | AQR Pass |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 541 |  | 559
Impaired loan, no related allowance, unpaid principal balance | 541 |  | 559
Recorded investment | 541 |  | 559
Unpaid principal balance | 541 |  | 559
Impaired loan, no related allowance, average recorded investment | 550 | 624 |
Impaired loan, no related allowance, interest income recognized | 10 | 11 |
Average recorded investment | 550 | 624 |
Interest income recognized | 10 | 11 |
Real estate term other | AQR Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, average recorded investment | 0 | 663 |
Impaired loan, no related allowance, interest income recognized | 0 | 11 |
Average recorded investment | 0 | 663 |
Interest income recognized | 0 | 11 |
Consumer secured by 1st deeds of trust | AQR Pass |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 135 |  | 136
Impaired loan, no related allowance, unpaid principal balance | 135 |  | 136
Recorded investment | 135 |  | 136
Unpaid principal balance | 135 |  | 136
Consumer secured by 1st deeds of trust | AQR Special Mention |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, average recorded investment | 0 | 142 |
Impaired loan, no related allowance, interest income recognized | 0 | 3 |
Average recorded investment | 0 | 142 |
Interest income recognized | 0 | 3 |
Consumer secured by 1st deeds of trust | AQR Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, recorded investment | 246 |  | 724
Impaired loan, no related allowance, unpaid principal balance | 246 |  | 809
Impaired loan, related allowance, recorded investment | 241 |  |
Impaired loan, related allowance, unpaid principal balance | 294 |  |
Related allowance | 2 |  |
Recorded investment | 487 |  | 724
Unpaid principal balance | 540 |  | $ 809
Impaired loan, no related allowance, average recorded investment | 248 | 455 |
Impaired loan, no related allowance, interest income recognized | 4 | 3 |
Impaired loan, related allowance, average recorded investment | 242 | 0 |
Impaired loan, related allowance, interest income recognized | 0 | 0 |
Average recorded investment | 490 | 455 |
Interest income recognized | 4 | 3 |
Consumer other | AQR Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loan, no related allowance, average recorded investment | 0 | 52 |
Impaired loan, no related allowance, interest income recognized | $ 0 | $ 1 |

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