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Loans and Allowance for Credit Losses (Troubled Debt Restructurings on Financing Receivables) (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 USD ($) contract | Sep. 30, 2016 USD ($) contract
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Number of contracts | contract | 2 | 4
Premodification outstanding recorded investment | $ 1,222 | $ 1,162
Postmodification outstanding recorded investment | 1,100 | 1,194
Related allowance |  |
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Related allowance |  |
Residential Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Number of contracts | contract |  | 3
Premodification outstanding recorded investment |  | $ 667
Postmodification outstanding recorded investment |  | 699
Related allowance |  |
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Number of contracts | contract | 1 | 1
Premodification outstanding recorded investment | $ 760 | $ 495
Postmodification outstanding recorded investment | 755 | 495
Related allowance |  |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Number of contracts | contract | 1 |
Premodification outstanding recorded investment | $ 462 |
Postmodification outstanding recorded investment | 345 |
Related allowance |  |
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Related allowance |  |

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- Definition Amount of allowance for credit losses related to loans that were modified and considered TDRs during the reporting period. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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