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Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Class (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) loans | Dec. 31, 2015 USD ($) loans | Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans removed from TDR resignation | loans | 0 | 5 |
Recorded investment of loans removed from TDR resignation |  | $ 1,600,000 |
Recorded investment in Troubled Debt Restructurings | $ 18,168,000 | 19,081,000 |
TDR loans accruing interest as of period end | 0 | 72,000 |
Acquired loans included in TDR | 0 | $ 137,000 |
Number of loans transferred to loans held-for-sale | loans |  | 1 |
Charge-off on loan transferred to held-for-sale | 36,000 | $ 864,000 | $ 277,000
Gain (loss) on transfer of loans to held-for-sale |  | 0 |
Commercial loans | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment in Troubled Debt Restructurings | 2,207,000 | 4,698,000 |
Charge-off on loan transferred to held-for-sale | 11,000 | 5,000 | 66,000
Commercial real estate loans | Commercial real estate, owner-occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment in Troubled Debt Restructurings | 6,993,000 | 6,993,000 |
Charge-off on loan transferred to held-for-sale | 20,000 | 0 | 0
Commercial real estate loans | Commercial real estate, investor |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment in Troubled Debt Restructurings | 2,256,000 | 514,000 |
Charge-off on loan transferred to held-for-sale | 0 | 0 | 0
Commercial real estate loans | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment in Troubled Debt Restructurings | 3,245,000 | 3,238,000 |
Loans reclassified to held-for-sale |  | 1,500,000 |
Charge-off on loan transferred to held-for-sale | 0 | 839,000 | 204,000
Residential loans | Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment in Troubled Debt Restructurings | 625,000 | 460,000 |
Charge-off on loan transferred to held-for-sale | 0 | 0 | 0
Residential loans | Other residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment in Troubled Debt Restructurings | 1,965,000 | 2,010,000 |
Charge-off on loan transferred to held-for-sale | 0 | 0 | 0
Consumer loans | Installment and other consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment in Troubled Debt Restructurings | 877,000 | 1,168,000 |
Charge-off on loan transferred to held-for-sale | $ 5,000 | $ 20,000 | $ 7,000

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