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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | $ 1,348 | $ 2,218 | $ 1,348 | $ 2,218 | $ 1,742
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 48,339 | 66,911 | 48,339 | 66,911 | 59,068
Unpaid Contractual Principal Balance |  | 51,635 | 70,537 | 51,635 | 70,537 | 62,508
Specific Allowance |  | 1,348 | 2,218 | 1,348 | 2,218 | 1,742
Average Investment in Impaired Loans |  | 49,134 | 68,862 | 52,515 | 67,440 | 66,358
Interest Income Recognized | [1] | 450 | 570 | 1,391 | 1,702 | 2,233
Commercial [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 4,669 | 5,250 | 4,669 | 5,250 | 5,653
Unpaid Contractual Principal Balance |  | 4,669 | 5,251 | 4,669 | 5,251 | 5,654
Average Investment in Impaired Loans |  | 4,864 | 5,259 | 5,142 | 5,330 | 5,415
Interest Income Recognized | [1] | 41 | 44 | 160 | 172 | 205
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 3,411 | 4,149 | 3,411 | 4,149 | 3,974
Unpaid Contractual Principal Balance |  | 3,412 | 4,149 | 3,412 | 4,149 | 3,974
Specific Allowance |  | 719 | 734 | 719 | 734 | 734
Average Investment in Impaired Loans |  | 3,445 | 4,213 | 3,712 | 4,270 | 4,216
Interest Income Recognized | [1] | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 8,080 | 9,399 | 8,080 | 9,399 | 9,627
Unpaid Contractual Principal Balance |  | 8,081 | 9,400 | 8,081 | 9,400 | 9,628
Specific Allowance |  | 719 | 734 | 719 | 734 | 734
Average Investment in Impaired Loans |  | 8,309 | 9,472 | 8,854 | 9,600 | 9,631
Interest Income Recognized | [1] | 41 | 44 | 160 | 172 | 205
Commercial [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 30,318 | 33,010 | 30,318 | 33,010 | 31,639
Unpaid Contractual Principal Balance |  | 31,551 | 34,086 | 31,551 | 34,086 | 33,268
Average Investment in Impaired Loans |  | 30,713 | 33,290 | 30,357 | 34,464 | 34,650
Interest Income Recognized | [1] | 316 | 261 | 985 | 858 | 1,180
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 835 | 6,070 | 835 | 6,070 | 2,718
Unpaid Contractual Principal Balance |  | 1,075 | 6,219 | 1,075 | 6,219 | 2,876
Specific Allowance |  | 317 | 1,273 | 317 | 1,273 | 827
Average Investment in Impaired Loans |  | 841 | 6,076 | 2,244 | 4,912 | 4,376
Interest Income Recognized | [1] | 6 | 5 | 7 | 9 | 11
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 31,153 | 39,080 | 31,153 | 39,080 | 34,357
Unpaid Contractual Principal Balance |  | 32,626 | 40,305 | 32,626 | 40,305 | 36,144
Specific Allowance |  | 317 | 1,273 | 317 | 1,273 | 827
Average Investment in Impaired Loans |  | 31,554 | 39,366 | 32,601 | 39,376 | 39,026
Interest Income Recognized | [1] | 322 | 266 | 992 | 867 | 1,191
Commercial [Member] | Other [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 7,163 | 15,972 | 7,163 | 15,972 | 13,069
Unpaid Contractual Principal Balance |  | 8,804 | 18,247 | 8,804 | 18,247 | 14,597
Average Investment in Impaired Loans |  | 7,312 | 17,577 | 9,182 | 16,421 | 15,663
Interest Income Recognized | [1] | 73 | 248 | 201 | 619 | 783
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 754 | 586 | 754 | 586 | 738
Unpaid Contractual Principal Balance |  | 935 | 710 | 935 | 710 | 862
Specific Allowance |  | 312 | 211 | 312 | 211 | 181
Average Investment in Impaired Loans |  | 776 | 587 | 788 | 460 | 531
Interest Income Recognized | [1] | 1 | 0 | 1 | 0 | 1
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 7,917 | 16,558 | 7,917 | 16,558 | 13,807
Unpaid Contractual Principal Balance |  | 9,739 | 18,957 | 9,739 | 18,957 | 15,459
Specific Allowance |  | 312 | 211 | 312 | 211 | 181
Average Investment in Impaired Loans |  | 8,088 | 18,164 | 9,970 | 16,881 | 16,194
Interest Income Recognized | [1] | 74 | 248 | 202 | 619 | 784
Residential [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 1,189 | 1,874 | 1,189 | 1,874 | 1,277
Unpaid Contractual Principal Balance |  | 1,189 | 1,875 | 1,189 | 1,875 | 1,277
Average Investment in Impaired Loans |  | 1,183 | 1,860 | 1,090 | 1,583 | 1,507
Interest Income Recognized | [1] | 13 | 12 | 37 | 44 | 53
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 1,189 | 1,874 | 1,189 | 1,874 | 1,277
Unpaid Contractual Principal Balance |  | 1,189 | 1,875 | 1,189 | 1,875 | 1,277
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,183 | 1,860 | 1,090 | 1,583 | 1,507
Interest Income Recognized | [1] | $ 13 | $ 12 | $ 37 | $ 44 | $ 53
[1] | Cash basis interest is substantially the same as interest income recognized.

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