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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | $ 1,313 | $ 2,461 | $ 1,742
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 52,202 | 49,888 | 59,068
Unpaid Contractual Principal Balance |  | 55,888 | 53,243 | 62,508
Specific Allowance |  | 1,313 | 2,461 | 1,742
Average Investment in Impaired Loans |  | 55,679 | 51,976 | 66,358
Interest Income Recognized | [1] | 2,530 | 1,952 | 2,233
Commercial [Member] | Construction [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 4,102 | 2,861 | 5,653
Unpaid Contractual Principal Balance |  | 4,123 | 2,862 | 5,654
Average Investment in Impaired Loans |  | 4,367 | 4,574 | 5,415
Interest Income Recognized | [1] | 218 | 200 | 205
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 1,507 | 3,402 | 3,974
Unpaid Contractual Principal Balance |  | 1,509 | 3,402 | 3,974
Specific Allowance |  | 213 | 831 | 734
Average Investment in Impaired Loans |  | 2,290 | 3,631 | 4,216
Interest Income Recognized | [1] | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 5,609 | 6,263 | 9,627
Unpaid Contractual Principal Balance |  | 5,632 | 6,264 | 9,628
Specific Allowance |  | 213 | 831 | 734
Average Investment in Impaired Loans |  | 6,657 | 8,205 | 9,631
Interest Income Recognized | [1] | 218 | 200 | 205
Commercial [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 29,025 | 30,761 | 31,639
Unpaid Contractual Principal Balance |  | 29,594 | 32,166 | 33,268
Average Investment in Impaired Loans |  | 31,136 | 30,605 | 34,650
Interest Income Recognized | [1] | 1,609 | 1,378 | 1,180
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 4,731 | 2,660 | 2,718
Unpaid Contractual Principal Balance |  | 5,885 | 2,768 | 2,876
Specific Allowance |  | 1,035 | 1,227 | 827
Average Investment in Impaired Loans |  | 4,151 | 2,349 | 4,376
Interest Income Recognized | [1] | 19 | 7 | 11
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 33,756 | 33,421 | 34,357
Unpaid Contractual Principal Balance |  | 35,479 | 34,934 | 36,144
Specific Allowance |  | 1,035 | 1,227 | 827
Average Investment in Impaired Loans |  | 35,287 | 32,954 | 39,026
Interest Income Recognized | [1] | 1,628 | 1,385 | 1,191
Commercial [Member] | Other [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 11,215 | 7,500 | 13,069
Unpaid Contractual Principal Balance |  | 13,155 | 9,148 | 14,597
Average Investment in Impaired Loans |  | 11,561 | 8,802 | 15,663
Interest Income Recognized | [1] | 632 | 316 | 783
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 139 | 960 | 738
Unpaid Contractual Principal Balance |  | 139 | 1,153 | 862
Specific Allowance |  | 65 | 403 | 181
Average Investment in Impaired Loans |  | 483 | 836 | 531
Interest Income Recognized | [1] | 0 | 1 | 1
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 11,354 | 8,460 | 13,807
Unpaid Contractual Principal Balance |  | 13,294 | 10,301 | 15,459
Specific Allowance |  | 65 | 403 | 181
Average Investment in Impaired Loans |  | 12,044 | 9,638 | 16,194
Interest Income Recognized | [1] | 632 | 317 | 784
Residential [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 1,483 | 1,744 | 1,277
Unpaid Contractual Principal Balance |  | 1,483 | 1,744 | 1,277
Average Investment in Impaired Loans |  | 1,691 | 1,179 | 1,507
Interest Income Recognized | [1] | 52 | 50 | 53
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 1,483 | 1,744 | 1,277
Unpaid Contractual Principal Balance |  | 1,483 | 1,744 | 1,277
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,691 | 1,179 | 1,507
Interest Income Recognized | [1] | $ 52 | $ 50 | $ 53
[1] | Cash basis interest is substantially the same as interest income recognized.

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