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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | $ 1,149 | $ 1,348 | $ 1,149 | $ 1,348 | $ 2,461
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 55,045 | 48,339 | 55,045 | 48,339 | 49,888
Unpaid Contractual Principal Balance |  | 58,743 | 51,635 | 58,743 | 51,635 | 53,243
Specific Allowance |  | 1,149 | 1,348 | 1,149 | 1,348 | 2,461
Average Investment in Impaired Loans |  | 55,572 | 49,134 | 56,646 | 52,515 | 51,976
Interest Income Recognized | [1] | 622 | 450 | 1,866 | 1,391 | 1,952
Commercial [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 4,270 | 4,669 | 4,270 | 4,669 | 2,861
Unpaid Contractual Principal Balance |  | 4,293 | 4,669 | 4,293 | 4,669 | 2,862
Average Investment in Impaired Loans |  | 4,299 | 4,864 | 4,450 | 5,142 | 4,574
Interest Income Recognized | [1] | 63 | 41 | 168 | 160 | 200
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 1,668 | 3,411 | 1,668 | 3,411 | 3,402
Unpaid Contractual Principal Balance |  | 1,670 | 3,412 | 1,670 | 3,412 | 3,402
Specific Allowance |  | 212 | 719 | 212 | 719 | 831
Average Investment in Impaired Loans |  | 1,798 | 3,445 | 2,524 | 3,712 | 3,631
Interest Income Recognized | [1] | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 5,938 | 8,080 | 5,938 | 8,080 | 6,263
Unpaid Contractual Principal Balance |  | 5,963 | 8,081 | 5,963 | 8,081 | 6,264
Specific Allowance |  | 212 | 719 | 212 | 719 | 831
Average Investment in Impaired Loans |  | 6,097 | 8,309 | 6,974 | 8,854 | 8,205
Interest Income Recognized | [1] | 63 | 41 | 168 | 160 | 200
Commercial [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 32,311 | 30,318 | 32,311 | 30,318 | 30,761
Unpaid Contractual Principal Balance |  | 33,004 | 31,551 | 33,004 | 31,551 | 32,166
Average Investment in Impaired Loans |  | 32,534 | 30,713 | 31,795 | 30,357 | 30,605
Interest Income Recognized | [1] | 390 | 316 | 1,164 | 985 | 1,378
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 3,537 | 835 | 3,537 | 835 | 2,660
Unpaid Contractual Principal Balance |  | 4,688 | 1,075 | 4,688 | 1,075 | 2,768
Specific Allowance |  | 747 | 317 | 747 | 317 | 1,227
Average Investment in Impaired Loans |  | 3,547 | 841 | 3,957 | 2,244 | 2,349
Interest Income Recognized | [1] | 1 | 6 | 19 | 7 | 7
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 35,848 | 31,153 | 35,848 | 31,153 | 33,421
Unpaid Contractual Principal Balance |  | 37,692 | 32,626 | 37,692 | 32,626 | 34,934
Specific Allowance |  | 747 | 317 | 747 | 317 | 1,227
Average Investment in Impaired Loans |  | 36,081 | 31,554 | 35,752 | 32,601 | 32,954
Interest Income Recognized | [1] | 391 | 322 | 1,183 | 992 | 1,385
Commercial [Member] | Other [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 11,382 | 7,163 | 11,382 | 7,163 | 7,500
Unpaid Contractual Principal Balance |  | 13,191 | 8,804 | 13,191 | 8,804 | 9,148
Average Investment in Impaired Loans |  | 11,497 | 7,312 | 11,564 | 9,182 | 8,802
Interest Income Recognized | [1] | 153 | 73 | 470 | 201 | 316
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 388 | 754 | 388 | 754 | 960
Unpaid Contractual Principal Balance |  | 408 | 935 | 408 | 935 | 1,153
Specific Allowance |  | 190 | 312 | 190 | 312 | 403
Average Investment in Impaired Loans |  | 405 | 776 | 597 | 788 | 836
Interest Income Recognized | [1] | 0 | 1 | 0 | 1 | 1
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 11,770 | 7,917 | 11,770 | 7,917 | 8,460
Unpaid Contractual Principal Balance |  | 13,599 | 9,739 | 13,599 | 9,739 | 10,301
Specific Allowance |  | 190 | 312 | 190 | 312 | 403
Average Investment in Impaired Loans |  | 11,902 | 8,088 | 12,161 | 9,970 | 9,638
Interest Income Recognized | [1] | 153 | 74 | 470 | 202 | 317
Residential [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 1,489 | 1,189 | 1,489 | 1,189 | 1,744
Unpaid Contractual Principal Balance |  | 1,489 | 1,189 | 1,489 | 1,189 | 1,744
Average Investment in Impaired Loans |  | 1,492 | 1,183 | 1,759 | 1,090 | 1,179
Interest Income Recognized | [1] | 15 | 13 | 45 | 37 | 50
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 1,489 | 1,189 | 1,489 | 1,189 | 1,744
Unpaid Contractual Principal Balance |  | 1,489 | 1,189 | 1,489 | 1,189 | 1,744
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,492 | 1,183 | 1,759 | 1,090 | 1,179
Interest Income Recognized | [1] | $ 15 | $ 13 | $ 45 | $ 37 | $ 50
[1] | Cash basis interest is substantially the same as interest income recognized.

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