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Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | $ 18,504 | $ 20,923
New TDRs |  | 2,570
Disbursements (payments) | (341) | (1,604)
Charge offs | (89) | (358)
TDR ending balance | 18,074 | 21,531
TDR, related allowance | 1,049 | 1,458
Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 5,504 | 5,428
New TDRs |  | 2,570
Disbursements (payments) | (212) | (979)
Charge offs |  | (241)
TDR ending balance | 5,292 | 6,778
TDR, related allowance | 800 | 766
Impaired Nonaccrual Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 1,603 | 445
Disbursements (payments) | (22) | (288)
TDR ending balance | 1,581 | 157
TDR, related allowance | 134 | 11
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 83 |
TDR ending balance | 83 |
Impaired Nonaccrual Loans [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance |  | 23
TDR ending balance |  | 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) | (190) | (691)
Charge offs |  | (241)
TDR ending balance | 3,628 | 6,598
TDR, related allowance | 666 | 755
Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 13,000 | 15,495
Disbursements (payments) | (129) | (625)
Charge offs | (89) | (117)
TDR ending balance | 12,782 | 14,753
TDR, related allowance | 249 | 692
Impaired Accruing Restructured Loans [Member] | Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
TDR beginning balance | 3,875 | 5,686
Disbursements (payments) | (82) | (31)
Charge offs | (89) |
TDR ending balance | 3,704 | 5,655
TDR, related allowance | 148 | 112
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
Disbursements (payments) | (37) | (517)
Charge offs |  | (117)
TDR ending balance | 4,899 | 5,106
TDR, related allowance | 84 | 552
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) | (10) | (77)
TDR ending balance | 4,179 | 3,992
TDR, related allowance | $ 17 | $ 28

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