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Loans and Allowance for Loan Losses - Credit Quality (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 1,728,871 | $ 1,679,013
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,693,389 | 1,629,865
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 23,081 | 21,242
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 12,401 | 27,906
Purchased credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 2,129 | 2,115
Purchased credit-impaired | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 2,129 | 1,325
Purchased credit-impaired | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 0 | 790
Purchased credit-impaired | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 0 | 0
Commercial loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 238,732 | 235,770
Total loans | 238,771 | 235,835
Commercial loans | Commercial and industrial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 223,259 | 214,636
Commercial loans | Commercial and industrial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 14,574 | 9,318
Commercial loans | Commercial and industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 899 | 11,816
Commercial loans | Purchased credit-impaired | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 39 | 65
Commercial real estate loans | Commercial real estate, owner-occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 315,269 | 299,797
Total loans | 316,467 | 300,963
Commercial real estate loans | Commercial real estate, owner-occupied | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 302,082 | 281,104
Commercial real estate loans | Commercial real estate, owner-occupied | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 5,192 | 9,284
Commercial real estate loans | Commercial real estate, owner-occupied | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 7,995 | 9,409
Commercial real estate loans | Commercial real estate, investor |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 840,687 | 822,194
Total loans | 841,493 | 822,984
Commercial real estate loans | Commercial real estate, investor | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 838,493 | 818,570
Commercial real estate loans | Commercial real estate, investor | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 2,194 | 1,850
Commercial real estate loans | Commercial real estate, investor | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 0 | 1,774
Commercial real estate loans | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 68,739 | 63,828
Total loans | 68,739 | 63,828
Commercial real estate loans | Construction | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 66,049 | 60,859
Commercial real estate loans | Construction | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 0 | 0
Commercial real estate loans | Construction | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 2,690 | 2,969
Commercial real estate loans | Purchased credit-impaired | Commercial real estate, owner-occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 1,198 | 1,166
Commercial real estate loans | Purchased credit-impaired | Commercial real estate, investor |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 806 | 790
Commercial real estate loans | Purchased credit-impaired | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 0 | 0
Residential loans | Home equity |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 121,157 | 132,373
Total loans | 121,243 | 132,467
Residential loans | Home equity | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 119,383 | 130,558
Residential loans | Home equity | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 1,121 | 0
Residential loans | Home equity | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 653 | 1,815
Residential loans | Other residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 113,383 | 95,526
Residential loans | Other residential | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 113,383 | 95,526
Residential loans | Other residential | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 0
Residential loans | Other residential | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 0
Residential loans | Purchased credit-impaired | Home equity |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 86 | 94
Residential loans | Purchased credit-impaired | Other residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 0 | 0
Consumer loans | Installment and other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 28,775 | 27,410
Consumer loans | Installment and other consumer | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 28,611 | 27,287
Consumer loans | Installment and other consumer | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 0 | 0
Consumer loans | Installment and other consumer | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 164 | 123
Consumer loans | Purchased credit-impaired | Installment and other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | $ 0 | $ 0

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