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Loans and Allowance for Loan Losses - Troubled Debt Restructuring Modifications (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) contract | Dec. 31, 2015 USD ($) contract | Dec. 31, 2014 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts Modified | contract | 4 |  | 17
Pre-Modification Outstanding Recorded Investment | $ 1,985,000 |  | $ 6,734,000
Post-Modification Outstanding Recorded Investment | 2,115,000 |  | 7,288,000
Post-Modification Outstanding Recorded Investment at Period End | 2,063,000 |  | 7,223,000
Total of TDR loans charged-off within previous 12 months | $ 0 | $ 0 | $ 0
Residential loans | Home equity |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts Modified | contract | 1 |  |
Pre-Modification Outstanding Recorded Investment | $ 87,000 |  |
Post-Modification Outstanding Recorded Investment | 222,000 |  |
Post-Modification Outstanding Recorded Investment at Period End | $ 245,000 |  |
Commercial loans | Commercial real estate, investor |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts Modified | contract | 2 |  | 2
Pre-Modification Outstanding Recorded Investment | $ 1,830,000 |  | $ 224,000
Post-Modification Outstanding Recorded Investment | 1,826,000 |  | 224,000
Post-Modification Outstanding Recorded Investment at Period End | $ 1,752,000 |  | $ 220,000
Commercial loans | Commercial and industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts Modified | contract |  | 7 | 6
Pre-Modification Outstanding Recorded Investment |  | $ 3,271,000 | $ 1,039,000
Post-Modification Outstanding Recorded Investment |  | 3,251,000 | 1,258,000
Post-Modification Outstanding Recorded Investment at Period End |  | $ 2,811,000 | $ 1,251,000
Commercial real estate loans | Commercial real estate, owner-occupied |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts Modified | contract |  |  | 1
Pre-Modification Outstanding Recorded Investment |  |  | $ 4,226,000
Post-Modification Outstanding Recorded Investment |  |  | 4,216,000
Post-Modification Outstanding Recorded Investment at Period End |  |  | $ 4,175,000
Commercial real estate loans | Construction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts Modified | contract |  |  | 2
Pre-Modification Outstanding Recorded Investment |  |  | $ 964,000
Post-Modification Outstanding Recorded Investment |  |  | 1,312,000
Post-Modification Outstanding Recorded Investment at Period End |  |  | $ 1,309,000
Consumer loans | Installment and other consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts Modified | contract | 1 |  | 6
Pre-Modification Outstanding Recorded Investment | $ 68,000 |  | $ 281,000
Post-Modification Outstanding Recorded Investment | 67,000 |  | 278,000
Post-Modification Outstanding Recorded Investment at Period End | $ 66,000 |  | $ 268,000

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