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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | $ 66,454 |  | $ 59,966 |  | $ 62,498 |
Unpaid Contractual Principal Balance | 72,539 |  | 65,721 |  | 68,596 |
Specific Allowance | 3,425 |  | 4,530 |  | 3,248 |
Average investment in impaired loans | 66,335 |  | 60,277 |  | 62,624 |
Interest Income Recognized | 532 | [1] | 369 | [1] | 1,880 | [1]
Commercial Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 5,155 |  | 4,594 |  | 3,692 |
Unpaid Contractual Principal Balance | 5,609 |  | 4,595 |  | 4,146 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 5,225 |  | 4,683 |  | 4,249 |
Interest Income Recognized | 74 | [1] | 18 | [1] | 97 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 6,073 |  | 5,912 |  | 5,703 |
Unpaid Contractual Principal Balance | 7,303 |  | 6,764 |  | 6,933 |
Specific Allowance | 1,911 |  | 2,180 |  | 1,820 |
Average Investment in Impaired Loans | 6,075 |  | 5,809 |  | 6,585 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 11,228 |  | 10,506 |  | 9,395 |
Unpaid Contractual Principal Balance | 12,912 |  | 11,359 |  | 11,079 |
Specific Allowance | 1,911 |  | 2,180 |  | 1,820 |
Average investment in impaired loans | 11,300 |  | 10,492 |  | 10,834 |
Interest Income Recognized | 74 | [1] | 18 | [1] | 97 | [1]
Commercial Secured by Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 33,765 |  | 36,312 |  | 35,046 |
Unpaid Contractual Principal Balance | 34,586 |  | 37,778 |  | 35,818 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 33,908 |  | 36,506 |  | 35,542 |
Interest Income Recognized | 297 | [1] | 332 | [1] | 1,337 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 4,158 |  | 3,382 |  | 3,067 |
Unpaid Contractual Principal Balance | 4,276 |  | 3,508 |  | 3,189 |
Specific Allowance | 1,192 |  | 1,246 |  | 1,090 |
Average Investment in Impaired Loans | 4,166 |  | 3,385 |  | 3,243 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 37,923 |  | 39,694 |  | 38,113 |
Unpaid Contractual Principal Balance | 38,862 |  | 41,286 |  | 39,007 |
Specific Allowance | 1,192 |  | 1,246 |  | 1,090 |
Average investment in impaired loans | 38,074 |  | 39,891 |  | 38,785 |
Interest Income Recognized | 297 | [1] | 332 |  | 1,337 | [1]
Commercial Other [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 15,779 |  | 6,696 |  | 13,285 |
Unpaid Contractual Principal Balance | 17,920 |  | 7,406 |  | 15,484 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 15,435 |  | 6,785 |  | 11,083 |
Interest Income Recognized | 154 | [1] | 16 | [1] | 416 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 867 |  | 2,791 |  | 1,010 |
Unpaid Contractual Principal Balance | 2,188 |  | 5,391 |  | 2,331 |
Specific Allowance | 322 |  | 1,104 |  | 338 |
Average Investment in Impaired Loans | 868 |  | 2,829 |  | 1,441 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 16,646 |  | 9,487 |  | 14,295 |
Unpaid Contractual Principal Balance | 20,108 |  | 12,797 |  | 17,815 |
Specific Allowance | 322 |  | 1,104 |  | 338 |
Average investment in impaired loans | 16,303 |  | 9,614 |  | 12,524 |
Interest Income Recognized | 154 | [1] | 16 |  | 416 | [1]
Real Estate Mortgage [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 657 |  | 279 |  | 695 |
Unpaid Contractual Principal Balance | 657 |  | 279 |  | 695 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 658 |  | 280 |  | 481 |
Interest Income Recognized | 7 | [1] | 3 | [1] | 30 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 657 |  | 279 |  | 695 |
Unpaid Contractual Principal Balance | 657 |  | 279 |  | 695 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average investment in impaired loans | 658 |  | 280 |  | 481 |
Interest Income Recognized | $ 7 | [1] | $ 3 | [1] | $ 30 | [1]
[1] | Cash basis interest is substantially the same as interest income recognized.

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