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Loans and Allowance for Credit Losses (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) property | Dec. 31, 2016 USD ($) property
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Deferred fees | $ 509 | $ 632 | $ 509
Discounts On Acquired Loans |  | 2,000 |
Loans | 871,525 | 1,047,247 | 871,525
Allowance period increase due to revised methodology used in calculation | 1,100 |  |
Allowance period adjusted amoung due to revised methodology used in calculation | (850) |  |
Other real estate owned, net | 2,477 | 1,809 | 2,477
Residential Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans | 325,768 | 387,722 | 325,768
Other real estate owned, net | 92 | $ 0 | $ 92
Number of properties in other real estate owned | property |  | 2 | 3
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans | 6,639 | $ 6,483 | $ 6,639
Mortgage loans in process of foreclosure, amount | 687 | 620 | 687
Special Mention [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans | 22,637 | 16,076 | 22,637
Special Mention [Member] | Residential Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans | 6,646 | 5,509 | 6,646
Special Mention [Member] | Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans |  | 0 |
Substandard [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans | 22,691 | 21,410 | 22,691
Substandard [Member] | Residential Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans | 6,880 | 5,613 | 6,880
Substandard [Member] | Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans | 99 |  | 99
Substandard [Member] | Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans | $ 9,000 | 6,300 | $ 9,000
Doubtful [Member] | Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans |  | $ 0 |

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