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Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Total impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded balance | $ 63,292 |  | $ 60,891 |  | $ 63,292 |  | $ 60,891 |  | $ 62,498 |
Unpaid Contractual Principal Balance | 68,218 |  | 66,227 |  | 68,218 |  | 66,227 |  | 68,596 |
Specific Allowance | 3,280 |  | 3,574 |  | 3,280 |  | 3,574 |  | 3,248 |
Average investment in impaired loans | 63,739 |  | 61,455 |  | 64,574 |  | 62,151 |  | 62,624 |
Interest Income Recognized | 624 | [1] | 441 | [1] | 1,613 | [1] | 1,251 | [1] | 1,880 | [1]
Commercial Construction [Member] |  |  |  |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 5,586 |  | 3,032 |  | 5,586 |  | 3,032 |  | 3,692 |
Unpaid Contractual Principal Balance | 6,163 |  | 3,032 |  | 6,163 |  | 3,032 |  | 4,146 |
Specific Allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 5,597 |  | 3,034 |  | 5,622 |  | 4,072 |  | 4,249 |
Interest Income Recognized | 77 | [1] | 32 | [1] | 204 | [1] | 90 | [1] | 97 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 4,557 |  | 7,070 |  | 4,557 |  | 7,070 |  | 5,703 |
Unpaid Contractual Principal Balance | 4,563 |  | 8,298 |  | 4,563 |  | 8,298 |  | 6,933 |
Specific Allowance | 1,827 |  | 2,321 |  | 1,827 |  | 2,321 |  | 1,820 |
Average Investment in Impaired Loans | 4,572 |  | 7,355 |  | 5,101 |  | 6,881 |  | 6,585 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded balance | 10,143 |  | 10,102 |  | 10,143 |  | 10,102 |  | 9,395 |
Unpaid Contractual Principal Balance | 10,726 |  | 11,330 |  | 10,726 |  | 11,330 |  | 11,079 |
Specific Allowance | 1,827 |  | 2,321 |  | 1,827 |  | 2,321 |  | 1,820 |
Average investment in impaired loans | 10,169 |  | 10,389 |  | 10,723 |  | 10,953 |  | 10,834 |
Interest Income Recognized | 77 | [1] | 32 | [1] | 204 | [1] | 90 | [1] | 97 | [1]
Commercial Secured by Real Estate [Member] |  |  |  |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 31,054 |  | 34,099 |  | 31,054 |  | 34,099 |  | 35,046 |
Unpaid Contractual Principal Balance | 31,929 |  | 34,586 |  | 31,929 |  | 34,586 |  | 35,818 |
Specific Allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 31,142 |  | 34,229 |  | 31,491 |  | 35,566 |  | 35,542 |
Interest Income Recognized | 405 | [1] | 291 | [1] | 938 | [1] | 976 | [1] | 1,337 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 5,423 |  | 3,406 |  | 5,423 |  | 3,406 |  | 3,067 |
Unpaid Contractual Principal Balance | 5,733 |  | 3,530 |  | 5,733 |  | 3,530 |  | 3,189 |
Specific Allowance | 1,295 |  | 938 |  | 1,295 |  | 938 |  | 1,090 |
Average Investment in Impaired Loans | 5,622 |  | 3,436 |  | 5,362 |  | 3,293 |  | 3,243 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded balance | 36,477 |  | 37,505 |  | 36,477 |  | 37,505 |  | 38,113 |
Unpaid Contractual Principal Balance | 37,662 |  | 38,116 |  | 37,662 |  | 38,116 |  | 39,007 |
Specific Allowance | 1,295 |  | 938 |  | 1,295 |  | 938 |  | 1,090 |
Average investment in impaired loans | 36,764 |  | 37,665 |  | 36,853 |  | 38,859 |  | 38,785 |
Interest Income Recognized | 405 | [1] | 291 | [1] | 938 | [1] | 976 | [1] | 1,337 | [1]
Commercial Other [Member] |  |  |  |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 15,179 |  | 11,643 |  | 15,179 |  | 11,643 |  | 13,285 |
Unpaid Contractual Principal Balance | 18,212 |  | 13,819 |  | 18,212 |  | 13,819 |  | 15,484 |
Specific Allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 15,264 |  | 11,756 |  | 15,508 |  | 10,348 |  | 11,083 |
Interest Income Recognized | 134 | [1] | 108 | [1] | 439 | [1] | 167 | [1] | 416 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 465 |  | 975 |  | 465 |  | 975 |  | 1,010 |
Unpaid Contractual Principal Balance | 590 |  | 2,295 |  | 590 |  | 2,295 |  | 2,331 |
Specific Allowance | 158 |  | 315 |  | 158 |  | 315 |  | 338 |
Average Investment in Impaired Loans | 515 |  | 977 |  | 587 |  | 1,582 |  | 1,441 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded balance | 15,644 |  | 12,618 |  | 15,644 |  | 12,618 |  | 14,295 |
Unpaid Contractual Principal Balance | 18,802 |  | 16,114 |  | 18,802 |  | 16,114 |  | 17,815 |
Specific Allowance | 158 |  | 315 |  | 158 |  | 315 |  | 338 |
Average investment in impaired loans | 15,779 |  | 12,733 |  | 16,095 |  | 11,930 |  | 12,524 |
Interest Income Recognized | 134 | [1] | 108 | [1] | 439 | [1] | 167 | [1] | 416 | [1]
Real Estate Mortgage [Member] |  |  |  |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 1,028 |  | 666 |  | 1,028 |  | 666 |  | 695 |
Unpaid Contractual Principal Balance | 1,028 |  | 667 |  | 1,028 |  | 667 |  | 695 |
Specific Allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 1,027 |  | 668 |  | 903 |  | 409 |  | 481 |
Interest Income Recognized | 8 | [1] | 10 | [1] | 32 | [1] | 18 | [1] | 30 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded balance | 1,028 |  | 666 |  | 1,028 |  | 666 |  | 695 |
Unpaid Contractual Principal Balance | 1,028 |  | 667 |  | 1,028 |  | 667 |  | 695 |
Specific Allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Average investment in impaired loans | 1,027 |  | 668 |  | 903 |  | 409 |  | 481 |
Interest Income Recognized | $ 8 | [1] | $ 10 | [1] | $ 32 | [1] | $ 18 | [1] | $ 30 | [1]
[1] | Cash basis interest is substantially the same as interest income recognized.

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