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Loans and Allowance for Loan Losses - Credit Quality (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | $ 1,671,740 | $ 1,679,013
Purchased credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 2,135 | 2,115
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 1,625,503 | 1,629,865
Pass | Purchased credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 1,338 | 1,325
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 18,430 | 21,242
Special Mention | Purchased credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 797 | 790
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 27,807 | 27,906
Substandard | Purchased credit-impaired |  |
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 | 231,628 | 235,770
Total loans | 231,680 | 235,835
Commercial loans | Commercial and industrial | Purchased credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 52 | 65
Commercial loans | Commercial and industrial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 213,676 | 214,636
Commercial loans | Commercial and industrial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 4,761 | 9,318
Commercial loans | Commercial and industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 13,191 | 11,816
Commercial real estate loans | Commercial real estate, owner-occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 299,183 | 299,797
Total loans | 300,377 | 300,963
Commercial real estate loans | Commercial real estate, owner-occupied | Purchased credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 1,194 | 1,166
Commercial real estate loans | Commercial real estate, owner-occupied | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 279,899 | 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 | 9,918 | 9,284
Commercial real estate loans | Commercial real estate, owner-occupied | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 9,366 | 9,409
Commercial real estate loans | Commercial real estate, investor |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 828,148 | 822,194
Total loans | 828,945 | 822,984
Commercial real estate loans | Commercial real estate, investor | Purchased credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 797 | 790
Commercial real estate loans | Commercial real estate, investor | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 824,867 | 818,570
Commercial real estate loans | Commercial real estate, investor | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 2,954 | 1,850
Commercial real estate loans | Commercial real estate, investor | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 327 | 1,774
Commercial real estate loans | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 64,978 | 63,828
Total loans | 64,978 | 63,828
Commercial real estate loans | Construction | Purchased credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 0 | 0
Commercial real estate loans | Construction | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 62,003 | 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 | 2,975 | 2,969
Residential loans | Home equity |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 124,607 | 132,373
Total loans | 124,699 | 132,467
Residential loans | Home equity | Purchased credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 92 | 94
Residential loans | Home equity | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 122,760 | 130,558
Residential loans | Home equity | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 0 | 0
Residential loans | Home equity | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans excluding purchased credit-impaired loans | 1,847 | 1,815
Residential loans | Other residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 95,621 | 95,526
Residential loans | Other residential | Purchased credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 0 | 0
Residential loans | Other residential | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 95,621 | 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
Consumer loans | Installment and other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 25,440 | 27,410
Consumer loans | Installment and other consumer | Purchased credit-impaired |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Purchased credit-impaired | 0 | 0
Consumer loans | Installment and other consumer | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans | 25,339 | 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 | $ 101 | $ 123

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