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Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | $ 16,624 | $ 18,504
Disbursements (payments) | (81) | (341)
Charge offs | (379) | (89)
Payoffs | (3,006) |
TDR ending balance | 13,158 | 18,074
TDR, related allowance | 757 | 1,049
Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 3,298 | 5,504
Disbursements (payments) | (20) | (212)
Reclassifications/transfer in/(out) | 154 |
TDR ending balance | 3,432 | 5,292
TDR, related allowance | 457 | 800
Impaired Nonaccrual Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance |  | 1,603
Disbursements (payments) |  | (22)
Reclassifications/transfer in/(out) | 154 |
TDR ending balance | 154 | 1,581
TDR, related allowance |  | 134
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 83 | 83
TDR ending balance | 83 | 83
Impaired Nonaccrual Loans [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 337 |
Disbursements (payments) | (4) |
TDR ending balance | 333 |
TDR, related allowance | 29 |
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 | 2,878 | 3,818
Disbursements (payments) | (16) | (190)
TDR ending balance | 2,862 | 3,628
TDR, related allowance | 428 | 666
Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 13,326 | 13,000
Disbursements (payments) | (61) | (129)
Charge offs | (379) | (89)
Reclassifications/transfer in/(out) | (154) |
Payoffs | (3,006) |
TDR ending balance | 9,726 | 12,782
TDR, related allowance | 300 | 249
Impaired Accruing Restructured Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 4,536 | 3,875
Disbursements (payments) | (25) | (82)
Charge offs |  | (89)
Reclassifications/transfer in/(out) | (154) |
Payoffs | (187) |
TDR ending balance | 4,170 | 3,704
TDR, related allowance | 223 | 148
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 4,818 | 4,936
Disbursements (payments) | (33) | (37)
Payoffs | (219) |
TDR ending balance | 4,566 | 4,899
TDR, related allowance | 36 | 84
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 | 3,972 | 4,189
Disbursements (payments) | (3) | (10)
Charge offs | (379) |
Payoffs | (2,600) |
TDR ending balance | 990 | 4,179
TDR, related allowance | $ 41 | $ 17

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