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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | $ 1,391 | $ 1,149 | $ 1,391 | $ 1,149 | $ 1,313
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 46,199 | 55,045 | 46,199 | 55,045 | 52,202
Unpaid Contractual Principal Balance |  | 49,740 | 58,743 | 49,740 | 58,743 | 55,888
Specific Allowance |  | 1,391 | 1,149 | 1,391 | 1,149 | 1,313
Average Investment in Impaired Loans |  | 46,629 | 55,572 | 49,684 | 56,646 | 55,679
Interest Income Recognized | [1] | 460 | 622 | 1,550 | 1,866 | 2,530
Commercial [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 4,613 | 4,270 | 4,613 | 4,270 | 4,102
Unpaid Contractual Principal Balance |  | 4,621 | 4,293 | 4,621 | 4,293 | 4,123
Average Investment in Impaired Loans |  | 4,662 | 4,299 | 4,955 | 4,450 | 4,367
Interest Income Recognized | [1] | 50 | 63 | 136 | 168 | 218
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 153 | 1,668 | 153 | 1,668 | 1,507
Unpaid Contractual Principal Balance |  | 174 | 1,670 | 174 | 1,670 | 1,509
Specific Allowance |  | 25 | 212 | 25 | 212 | 213
Average Investment in Impaired Loans |  | 153 | 1,798 | 156 | 2,524 | 2,290
Interest Income Recognized | [1] | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 4,766 | 5,938 | 4,766 | 5,938 | 5,609
Unpaid Contractual Principal Balance |  | 4,795 | 5,963 | 4,795 | 5,963 | 5,632
Specific Allowance |  | 25 | 212 | 25 | 212 | 213
Average Investment in Impaired Loans |  | 4,815 | 6,097 | 5,111 | 6,974 | 6,657
Interest Income Recognized | [1] | 50 | 63 | 136 | 168 | 218
Commercial [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 25,322 | 32,311 | 25,322 | 32,311 | 29,025
Unpaid Contractual Principal Balance |  | 25,916 | 33,004 | 25,916 | 33,004 | 29,594
Average Investment in Impaired Loans |  | 25,452 | 32,534 | 27,318 | 31,795 | 31,136
Interest Income Recognized | [1] | 276 | 390 | 980 | 1,164 | 1,609
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 3,918 | 3,537 | 3,918 | 3,537 | 4,731
Unpaid Contractual Principal Balance |  | 5,023 | 4,688 | 5,023 | 4,688 | 5,885
Specific Allowance |  | 1,301 | 747 | 1,301 | 747 | 1,035
Average Investment in Impaired Loans |  | 3,984 | 3,547 | 4,236 | 3,957 | 4,151
Interest Income Recognized | [1] | 3 | 1 | 8 | 19 | 19
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 29,240 | 35,848 | 29,240 | 35,848 | 33,756
Unpaid Contractual Principal Balance |  | 30,939 | 37,692 | 30,939 | 37,692 | 35,479
Specific Allowance |  | 1,301 | 747 | 1,301 | 747 | 1,035
Average Investment in Impaired Loans |  | 29,436 | 36,081 | 31,554 | 35,752 | 35,287
Interest Income Recognized | [1] | 279 | 391 | 988 | 1,183 | 1,628
Commercial [Member] | Equipment Lease Financing [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Average Investment in Impaired Loans |  | 0 |  | 45 |  |
Interest Income Recognized | [1] | 0 |  | 0 |  |
Total impaired loans [Abstract] |  |  |  |  |  |
Average Investment in Impaired Loans |  | 0 |  | 45 |  |
Interest Income Recognized | [1] | 0 |  | 0 |  |
Commercial [Member] | Other [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 9,994 | 11,382 | 9,994 | 11,382 | 11,215
Unpaid Contractual Principal Balance |  | 11,804 | 13,191 | 11,804 | 13,191 | 13,155
Average Investment in Impaired Loans |  | 10,191 | 11,497 | 10,717 | 11,564 | 11,561
Interest Income Recognized | [1] | 123 | 153 | 396 | 470 | 632
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 130 | 388 | 130 | 388 | 139
Unpaid Contractual Principal Balance |  | 133 | 408 | 133 | 408 | 139
Specific Allowance |  | 65 | 190 | 65 | 190 | 65
Average Investment in Impaired Loans |  | 130 | 405 | 87 | 597 | 483
Interest Income Recognized | [1] | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 10,124 | 11,770 | 10,124 | 11,770 | 11,354
Unpaid Contractual Principal Balance |  | 11,937 | 13,599 | 11,937 | 13,599 | 13,294
Specific Allowance |  | 65 | 190 | 65 | 190 | 65
Average Investment in Impaired Loans |  | 10,321 | 11,902 | 10,804 | 12,161 | 12,044
Interest Income Recognized | [1] | 123 | 153 | 396 | 470 | 632
Residential [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 873 |  | 873 |  |
Unpaid Contractual Principal Balance |  | 873 |  | 873 |  |
Average Investment in Impaired Loans |  | 860 |  | 569 |  |
Interest Income Recognized | [1] | 0 |  | 0 |  |
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | 0 |  | 0 |  |
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 873 |  | 873 |  |
Unpaid Contractual Principal Balance |  | 873 |  | 873 |  |
Specific Allowance |  | 0 |  | 0 |  |
Average Investment in Impaired Loans |  | 860 |  | 569 |  |
Interest Income Recognized | [1] | 0 |  | 0 |  |
Residential [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 1,196 | 1,489 | 1,196 | 1,489 | 1,483
Unpaid Contractual Principal Balance |  | 1,196 | 1,489 | 1,196 | 1,489 | 1,483
Average Investment in Impaired Loans |  | 1,197 | 1,492 | 1,601 | 1,759 | 1,691
Interest Income Recognized | [1] | 8 | 15 | 30 | 45 | 52
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 1,196 | 1,489 | 1,196 | 1,489 | 1,483
Unpaid Contractual Principal Balance |  | 1,196 | 1,489 | 1,196 | 1,489 | 1,483
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,197 | 1,492 | 1,601 | 1,759 | 1,691
Interest Income Recognized | [1] | $ 8 | $ 15 | $ 30 | $ 45 | $ 52
[1] | Cash basis interest is substantially the same as interest income recognized.

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