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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 | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Total impaired loans [Abstract] |  |  |
Recorded balance | $ 62,498 | $ 47,110 | $ 63,309
Unpaid Contractual Principal Balance | 68,596 | 53,378 | 67,212
Specific Allowance | 3,248 | 4,669 | 8,222
Average investment in impaired loans | 62,624 | 61,363 | 63,005
Interest Income Recognized | 1,880 | 1,983 | 531
Commercial Construction [Member] |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |
Recorded Balance | 3,692 | 4,778 | 6,313
Unpaid Contractual Principal Balance | 4,146 | 4,778 | 6,313
Specific Allowance | 0 | 0 | 0
Average Investment in Impaired Loans | 4,249 | 8,992 | 6,262
Interest Income Recognized | 97 | 252 | 43
Loans with a specific valuation allowance [Abstract] |  |  |
Recorded Balance | 5,703 | 5,794 | 9,528
Unpaid Contractual Principal Balance | 6,933 | 6,643 | 10,813
Specific Allowance | 1,820 | 2,203 | 2,554
Average Investment in Impaired Loans | 6,585 | 7,681 | 9,686
Interest income recognized | 0 | 0 | 0
Commercial Secured by Real Estate [Member] |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |
Recorded Balance | 35,046 | 27,811 | 23,503
Unpaid Contractual Principal Balance | 35,818 | 29,765 | 24,034
Specific Allowance | 0 | 0 | 0
Average Investment in Impaired Loans | 35,542 | 31,480 | 23,629
Interest Income Recognized | 1,337 | 1,543 | 330
Loans with a specific valuation allowance [Abstract] |  |  |
Recorded Balance | 3,067 | 3,525 | 9,188
Unpaid Contractual Principal Balance | 3,189 | 3,669 | 9,358
Specific Allowance | 1,090 | 1,156 | 2,575
Average Investment in Impaired Loans | 3,243 | 4,747 | 9,191
Interest income recognized | 0 | 23 | 2
Commercial Other [Member] |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |
Recorded Balance | 13,285 | 1,770 | 4,357
Unpaid Contractual Principal Balance | 15,484 | 2,501 | 4,616
Specific Allowance | 0 | 0 | 0
Average Investment in Impaired Loans | 11,083 | 3,392 | 4,407
Interest Income Recognized | 416 | 143 | 71
Loans with a specific valuation allowance [Abstract] |  |  |
Recorded Balance | 1,010 | 3,432 | 8,680
Unpaid Contractual Principal Balance | 2,331 | 6,022 | 10,338
Specific Allowance | 338 | 1,310 | 3,093
Average Investment in Impaired Loans | 1,441 | 5,071 | 8,090
Interest income recognized | 0 | 22 | 85
Residential [Member] |  |  |
Total impaired loans [Abstract] |  |  |
Recorded balance | 695 |  | 1,740
Unpaid Contractual Principal Balance | 695 |  | 1,740
Specific Allowance | 0 |  | 0
Average investment in impaired loans | 481 |  | 1,740
Interest Income Recognized | 30 |  | 0
Real Estate Construction [Member] |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |
Recorded Balance |  |  | 790
Unpaid Contractual Principal Balance |  |  | 790
Specific Allowance |  |  | 0
Average Investment in Impaired Loans |  |  | 790
Interest Income Recognized |  |  | 0
Real Estate Mortgage [Member] |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |
Recorded Balance | 695 |  | 950
Unpaid Contractual Principal Balance | 695 |  | 950
Specific Allowance | 0 |  | 0
Average Investment in Impaired Loans | 481 |  | 950
Interest Income Recognized | 30 |  | 0
Commerical [Member] |  |  |
Total impaired loans [Abstract] |  |  |
Recorded balance | 61,803 | 47,110 | 61,569
Unpaid Contractual Principal Balance | 67,901 | 53,378 | 65,472
Specific Allowance | 3,248 | 4,669 | 8,222
Average investment in impaired loans | 62,143 | 61,363 | 61,265
Interest Income Recognized | $ 1,850 | $ 1,983 | $ 531

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