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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Total impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded balance | $ 63,418 |  | $ 64,448 |  | $ 63,418 |  | $ 64,448 |  | $ 62,498 |
Unpaid Contractual Principal Balance | 69,876 |  | 70,370 |  | 69,876 |  | 70,370 |  | 68,596 |
Specific Allowance | 3,839 |  | 3,329 |  | 3,839 |  | 3,329 |  | 3,248 |
Average investment in impaired loans | 63,648 |  | 64,722 |  | 64,993 |  | 62,500 |  | 62,624 |
Interest Income Recognized | 457 | [1] | 441 | [1] | 989 | [1] | 810 | [1] | 1,880 | [1]
Commercial Construction [Member] |  |  |  |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 5,921 |  | 4,554 |  | 5,921 |  | 4,554 |  | 3,692 |
Unpaid Contractual Principal Balance | 6,498 |  | 4,554 |  | 6,498 |  | 4,554 |  | 4,146 |
Specific Allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 6,043 |  | 4,499 |  | 5,634 |  | 4,591 |  | 4,249 |
Interest Income Recognized | 53 | [1] | 40 | [1] | 127 | [1] | 58 | [1] | 97 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 4,655 |  | 7,561 |  | 4,655 |  | 7,561 |  | 5,703 |
Unpaid Contractual Principal Balance | 5,511 |  | 8,414 |  | 5,511 |  | 8,414 |  | 6,933 |
Specific Allowance | 1,890 |  | 1,823 |  | 1,890 |  | 1,823 |  | 1,820 |
Average Investment in Impaired Loans | 4,656 |  | 7,479 |  | 5,366 |  | 6,644 |  | 6,585 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded balance | 10,576 |  | 12,115 |  | 10,576 |  | 12,115 |  | 9,395 |
Unpaid Contractual Principal Balance | 12,009 |  | 12,968 |  | 12,009 |  | 12,968 |  | 11,079 |
Specific Allowance | 1,890 |  | 1,823 |  | 1,890 |  | 1,823 |  | 1,820 |
Average investment in impaired loans | 10,699 |  | 11,978 |  | 11,000 |  | 11,235 |  | 10,834 |
Interest Income Recognized | 53 | [1] | 40 | [1] | 127 | [1] | 58 | [1] | 97 | [1]
Commercial Secured by Real Estate [Member] |  |  |  |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 29,232 |  | 35,835 |  | 29,232 |  | 35,835 |  | 35,046 |
Unpaid Contractual Principal Balance | 30,155 |  | 36,307 |  | 30,155 |  | 36,307 |  | 35,818 |
Specific Allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 29,422 |  | 35,964 |  | 31,665 |  | 36,235 |  | 35,542 |
Interest Income Recognized | 236 | [1] | 353 | [1] | 533 | [1] | 685 | [1] | 1,337 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 6,194 |  | 3,057 |  | 6,194 |  | 3,057 |  | 3,067 |
Unpaid Contractual Principal Balance | 6,448 |  | 4,196 |  | 6,448 |  | 4,196 |  | 3,189 |
Specific Allowance | 1,866 |  | 1,084 |  | 1,866 |  | 1,084 |  | 1,090 |
Average Investment in Impaired Loans | 6,298 |  | 3,059 |  | 5,232 |  | 3,222 |  | 3,243 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded balance | 35,426 |  | 38,892 |  | 35,426 |  | 38,892 |  | 38,113 |
Unpaid Contractual Principal Balance | 36,603 |  | 40,503 |  | 36,603 |  | 40,503 |  | 39,007 |
Specific Allowance | 1,866 |  | 1,084 |  | 1,866 |  | 1,084 |  | 1,090 |
Average investment in impaired loans | 35,720 |  | 39,023 |  | 36,897 |  | 39,457 |  | 38,785 |
Interest Income Recognized | 236 | [1] | 353 | [1] | 533 | [1] | 685 | [1] | 1,337 | [1]
Commercial Other [Member] |  |  |  |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 16,036 |  | 12,253 |  | 16,036 |  | 12,253 |  | 13,285 |
Unpaid Contractual Principal Balance | 19,760 |  | 14,382 |  | 19,760 |  | 14,382 |  | 15,484 |
Specific Allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 15,825 |  | 12,504 |  | 15,630 |  | 9,645 |  | 11,083 |
Interest Income Recognized | 151 | [1] | 43 | [1] | 305 | [1] | 59 | [1] | 416 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 353 |  | 911 |  | 353 |  | 911 |  | 1,010 |
Unpaid Contractual Principal Balance | 477 |  | 2,239 |  | 477 |  | 2,239 |  | 2,331 |
Specific Allowance | 83 |  | 422 |  | 83 |  | 422 |  | 338 |
Average Investment in Impaired Loans | 379 |  | 939 |  | 624 |  | 1,884 |  | 1,441 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded balance | 16,389 |  | 13,164 |  | 16,389 |  | 13,164 |  | 14,295 |
Unpaid Contractual Principal Balance | 20,237 |  | 16,621 |  | 20,237 |  | 16,621 |  | 17,815 |
Specific Allowance | 83 |  | 422 |  | 83 |  | 422 |  | 338 |
Average investment in impaired loans | 16,204 |  | 13,443 |  | 16,254 |  | 11,529 |  | 12,524 |
Interest Income Recognized | 151 | [1] | 43 | [1] | 305 | [1] | 59 | [1] | 416 | [1]
Real Estate Mortgage [Member] |  |  |  |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded Balance | 1,027 |  | 277 |  | 1,027 |  | 277 |  | 695 |
Unpaid Contractual Principal Balance | 1,027 |  | 278 |  | 1,027 |  | 278 |  | 695 |
Specific Allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 1,025 |  | 278 |  | 842 |  | 279 |  | 481 |
Interest Income Recognized | 17 | [1] | 5 | [1] | 24 | [1] | 8 | [1] | 30 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |  |  |  |  |
Recorded balance | 1,027 |  | 277 |  | 1,027 |  | 277 |  | 695 |
Unpaid Contractual Principal Balance | 1,027 |  | 278 |  | 1,027 |  | 278 |  | 695 |
Specific Allowance | 0 |  | 0 |  | 0 |  | 0 |  | 0 |
Average investment in impaired loans | 1,025 |  | 278 |  | 842 |  | 279 |  | 481 |
Interest Income Recognized | $ 17 | [1] | $ 5 | [1] | $ 24 | [1] | $ 8 | [1] | $ 30 | [1]
[1] | Cash basis interest is substantially the same as interest income recognized.

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