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Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | $ 991 | $ 1,313 | $ 2,461
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 47,412 | 52,202 | 49,888
Unpaid Contractual Principal Balance |  | 52,212 | 55,888 | 53,243
Specific Allowance |  | 991 | 1,313 | 2,461
Average Investment in Impaired Loans |  | 49,343 | 55,679 | 51,976
Interest Income Recognized | [1] | 2,127 | 2,530 | 1,952
Commercial [Member] | Construction [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 4,431 | 4,102 | 2,861
Unpaid Contractual Principal Balance |  | 4,439 | 4,123 | 2,862
Average Investment in Impaired Loans |  | 4,835 | 4,367 | 4,574
Interest Income Recognized | [1] | 200 | 218 | 200
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 153 | 1,507 | 3,402
Unpaid Contractual Principal Balance |  | 173 | 1,509 | 3,402
Specific Allowance |  | 25 | 213 | 831
Average Investment in Impaired Loans |  | 155 | 2,290 | 3,631
Interest Income Recognized | [1] | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 4,584 | 5,609 | 6,263
Unpaid Contractual Principal Balance |  | 4,612 | 5,632 | 6,264
Specific Allowance |  | 25 | 213 | 831
Average Investment in Impaired Loans |  | 4,990 | 6,657 | 8,205
Interest Income Recognized | [1] | 200 | 218 | 200
Commercial [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 28,480 | 29,025 | 30,761
Unpaid Contractual Principal Balance |  | 30,365 | 29,594 | 32,166
Average Investment in Impaired Loans |  | 27,753 | 31,136 | 30,605
Interest Income Recognized | [1] | 1,344 | 1,609 | 1,378
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 2,985 | 4,731 | 2,660
Unpaid Contractual Principal Balance |  | 4,095 | 5,885 | 2,768
Specific Allowance |  | 966 | 1,035 | 1,227
Average Investment in Impaired Loans |  | 3,932 | 4,151 | 2,349
Interest Income Recognized | [1] | 8 | 19 | 7
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 31,465 | 33,756 | 33,421
Unpaid Contractual Principal Balance |  | 34,460 | 35,479 | 34,934
Specific Allowance |  | 966 | 1,035 | 1,227
Average Investment in Impaired Loans |  | 31,685 | 35,287 | 32,954
Interest Income Recognized | [1] | 1,352 | 1,628 | 1,385
Commercial [Member] | Equipment Lease Financing [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 0 | 0 | 0
Unpaid Contractual Principal Balance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 34 | 0 | 0
Interest Income Recognized | [1] | 0 | 0 | 0
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 0 | 0 | 0
Unpaid Contractual Principal Balance |  | 0 | 0 | 0
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 34 | 0 | 0
Interest Income Recognized | [1] | 0 | 0 | 0
Commercial [Member] | Other [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 9,481 | 11,215 | 7,500
Unpaid Contractual Principal Balance |  | 11,252 | 13,155 | 9,148
Average Investment in Impaired Loans |  | 10,444 | 11,561 | 8,802
Interest Income Recognized | [1] | 539 | 632 | 316
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 0 | 139 | 960
Unpaid Contractual Principal Balance |  | 0 | 139 | 1,153
Specific Allowance |  | 0 | 65 | 403
Average Investment in Impaired Loans |  | 65 | 483 | 836
Interest Income Recognized | [1] | 0 | 0 | 1
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 9,481 | 11,354 | 8,460
Unpaid Contractual Principal Balance |  | 11,252 | 13,294 | 10,301
Specific Allowance |  | 0 | 65 | 403
Average Investment in Impaired Loans |  | 10,509 | 12,044 | 9,638
Interest Income Recognized | [1] | 539 | 632 | 317
Residential [Member] | Construction [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 318 |  |
Unpaid Contractual Principal Balance |  | 318 |  |
Average Investment in Impaired Loans |  | 534 |  |
Interest Income Recognized | [1] | 0 |  |
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 |  |
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 318 |  |
Unpaid Contractual Principal Balance |  | 318 |  |
Specific Allowance |  | 0 |  |
Average Investment in Impaired Loans |  | 534 |  |
Interest Income Recognized | [1] | 0 |  |
Residential [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 1,564 | 1,483 | 1,744
Unpaid Contractual Principal Balance |  | 1,570 | 1,483 | 1,744
Average Investment in Impaired Loans |  | 1,591 | 1,691 | 1,179
Interest Income Recognized | [1] | 36 | 52 | 50
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 1,564 | 1,483 | 1,744
Unpaid Contractual Principal Balance |  | 1,570 | 1,483 | 1,744
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,591 | 1,691 | 1,179
Interest Income Recognized | [1] | $ 36 | $ 52 | $ 50
[1] | Cash basis interest is substantially the same as interest income recognized.

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