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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | $ 2,461 | $ 1,742 | $ 2,296
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 49,888 | 59,068 | 65,300
Unpaid Contractual Principal Balance |  | 53,243 | 62,508 | 68,228
Specific Allowance |  | 2,461 | 1,742 | 2,296
Average Investment in Impaired Loans |  | 51,976 | 66,358 | 64,890
Interest Income Recognized | [1] | 1,952 | 2,233 | 2,083
Commercial [Member] | Construction [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 2,861 | 5,653 | 5,457
Unpaid Contractual Principal Balance |  | 2,862 | 5,654 | 5,458
Average Investment in Impaired Loans |  | 4,574 | 5,415 | 5,595
Interest Income Recognized | [1] | 200 | 205 | 240
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 3,402 | 3,974 | 4,353
Unpaid Contractual Principal Balance |  | 3,402 | 3,974 | 4,359
Specific Allowance |  | 831 | 734 | 1,189
Average Investment in Impaired Loans |  | 3,631 | 4,216 | 4,935
Interest Income Recognized | [1] | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 6,263 | 9,627 | 9,810
Unpaid Contractual Principal Balance |  | 6,264 | 9,628 | 9,817
Specific Allowance |  | 831 | 734 | 1,189
Average Investment in Impaired Loans |  | 8,205 | 9,631 | 10,530
Interest Income Recognized | [1] | 200 | 205 | 240
Commercial [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 30,761 | 31,639 | 35,258
Unpaid Contractual Principal Balance |  | 32,166 | 33,268 | 36,173
Average Investment in Impaired Loans |  | 30,605 | 34,650 | 32,472
Interest Income Recognized | [1] | 1,378 | 1,180 | 1,231
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 2,660 | 2,718 | 4,039
Unpaid Contractual Principal Balance |  | 2,768 | 2,876 | 4,326
Specific Allowance |  | 1,227 | 827 | 1,005
Average Investment in Impaired Loans |  | 2,349 | 4,376 | 5,033
Interest Income Recognized | [1] | 7 | 11 | 1
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 33,421 | 34,357 | 39,297
Unpaid Contractual Principal Balance |  | 34,934 | 36,144 | 40,499
Specific Allowance |  | 1,227 | 827 | 1,005
Average Investment in Impaired Loans |  | 32,954 | 39,026 | 37,505
Interest Income Recognized | [1] | 1,385 | 1,191 | 1,232
Commercial [Member] | Other [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 7,500 | 13,069 | 14,839
Unpaid Contractual Principal Balance |  | 9,148 | 14,597 | 16,435
Average Investment in Impaired Loans |  | 8,802 | 15,663 | 15,396
Interest Income Recognized | [1] | 316 | 783 | 568
Loans with a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 960 | 738 | 330
Unpaid Contractual Principal Balance |  | 1,153 | 862 | 453
Specific Allowance |  | 403 | 181 | 102
Average Investment in Impaired Loans |  | 836 | 531 | 525
Interest Income Recognized | [1] | 1 | 1 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 8,460 | 13,807 | 15,169
Unpaid Contractual Principal Balance |  | 10,301 | 15,459 | 16,888
Specific Allowance |  | 403 | 181 | 102
Average Investment in Impaired Loans |  | 9,638 | 16,194 | 15,921
Interest Income Recognized | [1] | 317 | 784 | 568
Residential [Member] | Real Estate [Member] |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |
Recorded Balance |  | 1,744 | 1,277 | 1,024
Unpaid Contractual Principal Balance |  | 1,744 | 1,277 | 1,024
Average Investment in Impaired Loans |  | 1,179 | 1,507 | 934
Interest Income Recognized | [1] | 50 | 53 | 43
Loans with a specific valuation allowance [Abstract] |  |  |  |
Specific Allowance |  | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |
Recorded Balance |  | 1,744 | 1,277 | 1,024
Unpaid Contractual Principal Balance |  | 1,744 | 1,277 | 1,024
Specific Allowance |  | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,179 | 1,507 | 934
Interest Income Recognized | [1] | $ 50 | $ 53 | $ 43
[1] | Cash basis interest is substantially the same as interest income recognized.

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