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Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | $ 1,319 | $ 1,337 | $ 1,319 | $ 1,337 | $ 1,313
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 50,729 | 53,269 | 50,729 | 53,269 | 52,202
Unpaid Contractual Principal Balance |  | 54,443 | 57,044 | 54,443 | 57,044 | 55,888
Specific Allowance |  | 1,319 | 1,337 | 1,319 | 1,337 | 1,313
Average Investment in Impaired Loans |  | 51,594 | 54,916 | 51,214 | 57,185 | 55,679
Interest Income Recognized | [1] | 541 | 626 | 1,090 | 1,244 | 2,530
Commercial [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 4,707 | 4,455 | 4,707 | 4,455 | 4,102
Unpaid Contractual Principal Balance |  | 4,709 | 4,741 | 4,709 | 4,741 | 4,123
Average Investment in Impaired Loans |  | 5,041 | 4,730 | 5,101 | 4,526 | 4,367
Interest Income Recognized | [1] | 49 | 56 | 86 | 105 | 218
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 153 | 2,207 | 153 | 2,207 | 1,507
Unpaid Contractual Principal Balance |  | 174 | 2,209 | 174 | 2,209 | 1,509
Specific Allowance |  | 25 | 287 | 25 | 287 | 213
Average Investment in Impaired Loans |  | 153 | 2,372 | 157 | 2,887 | 2,290
Interest Income Recognized | [1] | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 4,860 | 6,662 | 4,860 | 6,662 | 5,609
Unpaid Contractual Principal Balance |  | 4,883 | 6,950 | 4,883 | 6,950 | 5,632
Specific Allowance |  | 25 | 287 | 25 | 287 | 213
Average Investment in Impaired Loans |  | 5,194 | 7,102 | 5,258 | 7,413 | 6,657
Interest Income Recognized | [1] | 49 | 56 | 86 | 105 | 218
Commercial [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 27,509 | 30,181 | 27,509 | 30,181 | 29,025
Unpaid Contractual Principal Balance |  | 28,195 | 30,816 | 28,195 | 30,816 | 29,594
Average Investment in Impaired Loans |  | 27,858 | 30,339 | 28,252 | 31,426 | 31,136
Interest Income Recognized | [1] | 343 | 387 | 704 | 774 | 1,609
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 4,731 | 2,667 | 4,731 | 2,667 | 4,731
Unpaid Contractual Principal Balance |  | 5,833 | 3,721 | 5,833 | 3,721 | 5,885
Specific Allowance |  | 1,227 | 720 | 1,227 | 720 | 1,035
Average Investment in Impaired Loans |  | 4,745 | 3,598 | 4,362 | 4,163 | 4,151
Interest Income Recognized | [1] | 5 | 0 | 5 | 18 | 19
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 32,240 | 32,848 | 32,240 | 32,848 | 33,756
Unpaid Contractual Principal Balance |  | 34,028 | 34,537 | 34,028 | 34,537 | 35,479
Specific Allowance |  | 1,227 | 720 | 1,227 | 720 | 1,035
Average Investment in Impaired Loans |  | 32,603 | 33,937 | 32,614 | 35,589 | 35,287
Interest Income Recognized | [1] | 348 | 387 | 709 | 792 | 1,628
Commercial [Member] | Equipment Lease Financing [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 130 |  | 130 |  |
Unpaid Contractual Principal Balance |  | 130 |  | 130 |  |
Average Investment in Impaired Loans |  | 135 |  | 68 |  |
Interest Income Recognized | [1] | 0 |  | 0 |  |
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | 0 |  | 0 |  |
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 130 |  | 130 |  |
Unpaid Contractual Principal Balance |  | 130 |  | 130 |  |
Specific Allowance |  | 0 |  | 0 |  |
Average Investment in Impaired Loans |  | 135 |  | 68 |  |
Interest Income Recognized | [1] | 0 |  | 0 |  |
Commercial [Member] | Other [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 10,719 | 11,328 | 10,719 | 11,328 | 11,215
Unpaid Contractual Principal Balance |  | 12,619 | 13,113 | 12,619 | 13,113 | 13,155
Average Investment in Impaired Loans |  | 10,882 | 11,446 | 10,981 | 11,597 | 11,561
Interest Income Recognized | [1] | 133 | 169 | 273 | 317 | 632
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 131 | 670 | 131 | 670 | 139
Unpaid Contractual Principal Balance |  | 134 | 683 | 134 | 683 | 139
Specific Allowance |  | 67 | 330 | 67 | 330 | 65
Average Investment in Impaired Loans |  | 131 | 667 | 66 | 693 | 483
Interest Income Recognized | [1] | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 10,850 | 11,998 | 10,850 | 11,998 | 11,354
Unpaid Contractual Principal Balance |  | 12,753 | 13,796 | 12,753 | 13,796 | 13,294
Specific Allowance |  | 67 | 330 | 67 | 330 | 65
Average Investment in Impaired Loans |  | 11,013 | 12,113 | 11,047 | 12,290 | 12,044
Interest Income Recognized | [1] | 133 | 169 | 273 | 317 | 632
Residential [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 846 |  | 846 |  |
Unpaid Contractual Principal Balance |  | 846 |  | 846 |  |
Average Investment in Impaired Loans |  | 846 |  | 423 |  |
Interest Income Recognized | [1] | 0 |  | 0 |  |
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | 0 |  | 0 |  |
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 846 |  | 846 |  |
Unpaid Contractual Principal Balance |  | 846 |  | 846 |  |
Specific Allowance |  | 0 |  | 0 |  |
Average Investment in Impaired Loans |  | 846 |  | 423 |  |
Interest Income Recognized | [1] | 0 |  | 0 |  |
Residential [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 1,803 | 1,761 | 1,803 | 1,761 | 1,483
Unpaid Contractual Principal Balance |  | 1,803 | 1,761 | 1,803 | 1,761 | 1,483
Average Investment in Impaired Loans |  | 1,803 | 1,764 | 1,804 | 1,893 | 1,691
Interest Income Recognized | [1] | 11 | 14 | 22 | 30 | 52
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 1,803 | 1,761 | 1,803 | 1,761 | 1,483
Unpaid Contractual Principal Balance |  | 1,803 | 1,761 | 1,803 | 1,761 | 1,483
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,803 | 1,764 | 1,804 | 1,893 | 1,691
Interest Income Recognized | [1] | $ 11 | $ 14 | $ 22 | $ 30 | $ 52
[1] | Cash basis interest is substantially the same as interest income recognized.

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