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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, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Total impaired loans [Abstract] |  |  |  |  |  |  |
Recorded balance | $ 60,891 |  | $ 56,021 |  | $ 60,891 | $ 56,021 | $ 47,424
Unpaid Contractual Principal Balance | 66,227 |  | 61,515 |  | 66,227 | 61,515 | 53,692
Specific Allowance | 3,574 |  | 6,305 |  | 3,574 | 6,305 | 4,669
Average investment in impaired loans | 61,455 |  | 56,031 |  | 62,151 | 63,404 | 61,647
Interest Income Recognized | 441 | [1] | 786 | [1] | 1,251 | 1,600 | 2,010
Commercial Construction [Member] |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |
Recorded Balance | 3,032 |  | 5,748 |  | 3,032 | 5,748 | 4,778
Unpaid Contractual Principal Balance | 3,032 |  | 5,748 |  | 3,032 | 5,748 | 4,778
Average Investment in Impaired Loans | 3,034 |  | 5,733 |  | 4,072 | 9,239 | 8,992
Interest Income Recognized | 32 | [1] | 76 | [1] | 90 | 193 | 252
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |  |
Recorded Balance | 7,070 |  | 9,247 |  | 7,070 | 9,247 | 5,794
Unpaid Contractual Principal Balance | 8,298 |  | 10,756 |  | 8,298 | 10,756 | 6,643
Specific Allowance | 2,321 |  | 3,714 |  | 2,321 | 3,714 | 2,203
Average Investment in Impaired Loans | 7,355 |  | 9,440 |  | 6,881 | 8,614 | 7,681
Interest income recognized | 0 | [1] | 0 | [1] | 0 | 0 | 0
Commercial Secured By Real Estate [Member] |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |
Recorded Balance | 34,099 |  | 31,308 |  | 34,099 | 31,308 | 27,811
Unpaid Contractual Principal Balance | 34,586 |  | 32,483 |  | 34,586 | 32,483 | 29,765
Average Investment in Impaired Loans | 34,229 |  | 30,910 |  | 35,566 | 31,901 | 31,480
Interest Income Recognized | 291 | [1] | 666 | [1] | 976 | 1,239 | 1,543
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |  |
Recorded Balance | 3,406 |  | 4,619 |  | 3,406 | 4,619 | 3,525
Unpaid Contractual Principal Balance | 3,530 |  | 4,754 |  | 3,530 | 4,754 | 3,669
Specific Allowance | 938 |  | 1,826 |  | 938 | 1,826 | 1,156
Average Investment in Impaired Loans | 3,436 |  | 4,632 |  | 3,293 | 5,025 | 4,747
Interest income recognized | 0 | [1] | 0 | [1] | 0 | 23 | 23
Commercial Other [Member] |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |
Recorded Balance | 11,643 |  | 2,996 |  | 11,643 | 2,996 | 1,770
Unpaid Contractual Principal Balance | 13,819 |  | 3,091 |  | 13,819 | 3,091 | 2,501
Average Investment in Impaired Loans | 11,756 |  | 3,129 |  | 10,348 | 3,677 | 3,392
Interest Income Recognized | 108 | [1] | 38 | [1] | 167 | 126 | 143
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |  |
Recorded Balance | 975 |  | 1,793 |  | 975 | 1,793 | 3,432
Unpaid Contractual Principal Balance | 2,295 |  | 4,373 |  | 2,295 | 4,373 | 6,022
Specific Allowance | 315 |  | 765 |  | 315 | 765 | 1,310
Average Investment in Impaired Loans | 977 |  | 1,873 |  | 1,582 | 4,666 | 5,071
Interest income recognized | 0 | [1] | 0 | [1] | 0 | 0 | 22
Residential [Member] |  |  |  |  |  |  |
Total impaired loans [Abstract] |  |  |  |  |  |  |
Recorded balance | 666 |  | 111 |  | 666 | 111 | 109
Unpaid Contractual Principal Balance | 667 |  | 111 |  | 667 | 111 | 109
Specific Allowance | 0 |  | 0 |  | 0 | 0 | 0
Average investment in impaired loans | 668 |  | 111 |  | 409 | 103 | 103
Interest Income Recognized | 10 | [1] | 1 | [1] | 18 | 5 | 6
Consumer [Member] |  |  |  |  |  |  |
Total impaired loans [Abstract] |  |  |  |  |  |  |
Recorded balance |  |  | 199 |  |  | 199 | 205
Unpaid Contractual Principal Balance |  |  | 199 |  |  | 199 | 205
Specific Allowance |  |  | 0 |  |  | 0 | 0
Average investment in impaired loans |  |  | 203 |  |  | 179 | 181
Interest Income Recognized |  |  | 5 | [1] |  | 14 | 21
Real Estate Construction [Member] |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |
Recorded Balance |  |  | 28 |  |  | 28 | 27
Unpaid Contractual Principal Balance |  |  | 28 |  |  | 28 | 27
Average Investment in Impaired Loans |  |  | 28 |  |  | 19 | 19
Interest Income Recognized |  |  | 0 | [1] |  | 1 | 1
Real Estate Mortgage [Member] |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |
Recorded Balance | 666 |  | 83 |  | 666 | 83 | 82
Unpaid Contractual Principal Balance | 667 |  | 83 |  | 667 | 83 | 82
Average Investment in Impaired Loans | 668 |  | 83 |  | 409 | 84 | 84
Interest Income Recognized | 10 | [1] | 1 | [1] | 18 | 4 | 5
Consumer Direct [Member] |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |
Recorded Balance |  |  | 78 |  |  | 78 | 93
Unpaid Contractual Principal Balance |  |  | 78 |  |  | 78 | 93
Average Investment in Impaired Loans |  |  | 79 |  |  | 78 | 82
Interest Income Recognized |  |  | 2 | [1] |  | 6 | 9
Consumer Indirect [Member] |  |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |  |
Recorded Balance |  |  | 121 |  |  | 121 | 112
Unpaid Contractual Principal Balance |  |  | 121 |  |  | 121 | 112
Average Investment in Impaired Loans |  |  | 124 |  |  | 101 | 99
Interest Income Recognized |  |  | 3 | [1] |  | 8 | 12
Commerical [Member] |  |  |  |  |  |  |
Total impaired loans [Abstract] |  |  |  |  |  |  |
Recorded balance | 60,225 |  | 55,711 |  | 60,225 | 55,711 | 47,110
Unpaid Contractual Principal Balance | 65,560 |  | 61,205 |  | 65,560 | 61,205 | 53,378
Specific Allowance | 3,574 |  | 6,305 |  | 3,574 | 6,305 | 4,669
Average investment in impaired loans | 60,787 |  | 55,717 |  | 61,742 | 63,122 | 61,363
Interest Income Recognized | $ 431 | [1] | $ 780 | [1] | $ 1,233 | $ 1,581 | $ 1,983
[1] | Cash basis interest is substantially the same as interest income recognized.

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