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Loans and Allowance for Credit Losses (Aging of Past Due Financing Receivables) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | $ 1,037,011 | $ 852,410
Total past due | 3,947 | 10,143
Nonaccrual | 6,289 | 8,972
Total loans | $ 1,047,247 | $ 871,525
Percent of total loans, Current | 99.00% | 97.80%
Percent of total loans, Total past due | 0.40% | 1.20%
Percent of total loans, Nonaccrual | 0.60% | 1.00%
Percent of total loans, Total loans | 100.00% | 100.00%
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | $ 3,239 | $ 5,029
Percent of total loans, Total past due | 0.30% | 0.60%
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | $ 703 | $ 5,094
Percent of total loans, Total past due | 0.10% | 0.60%
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | $ 5 | $ 20
Residential Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 383,913 | 317,992
Total past due | 1,244 | 3,873
Nonaccrual | 2,565 | 3,903
Total loans | 387,722 | 325,768
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 572 | 1,778
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 667 | 2,095
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 5 |
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 451,789 | 375,552
Total past due | 2,407 | 5,977
Nonaccrual | 430 | 1,152
Total loans | 454,626 | 382,681
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 2,407 | 3,219
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due |  | 2,758
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 91,225 | 72,272
Total past due | 233 | 163
Nonaccrual | 341 |
Total loans | 91,799 | 72,435
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 202 | 19
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 31 | 134
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due |  | 10
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 6,478 | 6,515
Total past due | 5 | 25
Nonaccrual |  | 99
Total loans | 6,483 | 6,639
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due |  | 13
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 5 | 2
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due |  | 10
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 103,606 | 80,079
Total past due | 58 | 105
Nonaccrual | 2,953 | 3,818
Total loans | 106,617 | 84,002
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | $ 58 |
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due |  | $ 105

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