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Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | $ 18,504 | $ 20,923
New TDRs | 345 | 3,630
Disbursements (payments) | (1,195) | (3,263)
Charge offs | (89) | (638)
Reclassifications/transfer in/(out) | (108) |
Payoffs | (586) | (179)
TDR ending balance | 16,871 | 20,473
TDR, related allowance | 875 | 1,211
Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 5,504 | 5,428
New TDRs | 345 | 2,570
Disbursements (payments) | (952) | (2,329)
Charge offs |  | (521)
Reclassifications/transfer in/(out) | (1,519) | 2,053
TDR ending balance | 3,378 | 7,201
TDR, related allowance | 571 | 947
Impaired Nonaccrual Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 1,603 | 445
Disbursements (payments) | (66) | (294)
Reclassifications/transfer in/(out) | (1,411) | 1,595
TDR ending balance | 126 | 1,746
TDR, related allowance | 23 | 25
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 83 |
Charge offs |  | (258)
Reclassifications/transfer in/(out) |  | 458
TDR ending balance | 83 | 200
TDR, related allowance |  | 112
Impaired Nonaccrual Loans [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
New TDRs | 345 |
Disbursements (payments) | (4) |
TDR ending balance | 341 |
Impaired Nonaccrual Loans [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance |  | 23
Disbursements (payments) |  | (23)
Impaired Nonaccrual Loans [Member] | Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 3,818 | 4,960
New TDRs |  | 2,570
Disbursements (payments) | (882) | (2,012)
Charge offs |  | (263)
Reclassifications/transfer in/(out) | (108) |
TDR ending balance | 2,828 | 5,255
TDR, related allowance | 548 | 810
Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 13,000 | 15,495
New TDRs |  | 1,060
Disbursements (payments) | (243) | (934)
Charge offs | (89) | (117)
Reclassifications/transfer in/(out) | 1,411 | (2,053)
Payoffs | (586) | (179)
TDR ending balance | 13,493 | 13,272
TDR, related allowance | 304 | 264
Impaired Accruing Restructured Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 3,875 | 5,686
New TDRs |  | 565
Disbursements (payments) | (120) | (375)
Charge offs | (89) |
Reclassifications/transfer in/(out) | 1,411 | (1,595)
Payoffs | (452) | (179)
TDR ending balance | 4,625 | 4,102
TDR, related allowance | 228 | 154
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 4,936 | 5,740
New TDRs |  | 495
Disbursements (payments) | (101) | (689)
Charge offs |  | (117)
Reclassifications/transfer in/(out) |  | (458)
TDR ending balance | 4,835 | 4,971
TDR, related allowance | 35 | 89
Impaired Accruing Restructured Loans [Member] | Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 4,189 | 4,069
Disbursements (payments) | (22) | 130
Payoffs | (134) |
TDR ending balance | 4,033 | 4,199
TDR, related allowance | $ 41 | $ 21

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