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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | $ 65,300 |  | $ 62,498 |  | $ 47,110 |
Unpaid Contractual Principal Balance | 68,228 |  | 68,596 |  | 53,378 |
Specific Allowance | 2,296 |  | 3,248 |  | 4,669 |
Average investment in impaired loans | 64,890 |  | 62,624 |  | 61,363 |
Interest Income Recognized | 2,083 | [1] | 1,880 | [1] | 1,983 | [1]
Commercial Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 5,457 |  | 3,692 |  | 4,778 |
Unpaid Contractual Principal Balance | 5,458 |  | 4,146 |  | 4,778 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 5,595 |  | 4,249 |  | 8,992 |
Interest Income Recognized | 240 | [1] | 97 | [1] | 252 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 4,353 |  | 5,703 |  | 5,794 |
Unpaid Contractual Principal Balance | 4,359 |  | 6,933 |  | 6,643 |
Specific Allowance | 1,189 |  | 1,820 |  | 2,203 |
Average Investment in Impaired Loans | 4,935 |  | 6,585 |  | 7,681 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 9,810 |  | 9,395 |  | 10,572 |
Unpaid Contractual Principal Balance | 9,817 |  | 11,079 |  | 11,421 |
Specific Allowance | 1,189 |  | 1,820 |  | 2,203 |
Average investment in impaired loans | 10,530 |  | 10,834 |  | 16,673 |
Interest Income Recognized | 240 | [1] | 97 | [1] | 252 | [1]
Commercial Secured by Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 35,258 |  | 35,046 |  | 27,811 |
Unpaid Contractual Principal Balance | 36,173 |  | 35,818 |  | 29,765 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 32,472 |  | 35,542 |  | 31,480 |
Interest Income Recognized | 1,231 | [1] | 1,337 | [1] | 1,543 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 4,039 |  | 3,067 |  | 3,525 |
Unpaid Contractual Principal Balance | 4,326 |  | 3,189 |  | 3,669 |
Specific Allowance | 1,005 |  | 1,090 |  | 1,156 |
Average Investment in Impaired Loans | 5,033 |  | 3,243 |  | 4,747 |
Interest income recognized | 1 | [1] | 0 | [1] | 23 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 39,297 |  | 38,113 |  | 31,336 |
Unpaid Contractual Principal Balance | 40,499 |  | 39,007 |  | 33,434 |
Specific Allowance | 1,005 |  | 1,090 |  | 1,156 |
Average investment in impaired loans | 37,505 |  | 38,785 |  | 36,227 |
Interest Income Recognized | 1,232 | [1] | 1,337 | [1] | 1,566 | [1]
Commercial Other [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 14,839 |  | 13,285 |  | 1,770 |
Unpaid Contractual Principal Balance | 16,435 |  | 15,484 |  | 2,501 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 15,396 |  | 11,083 |  | 3,392 |
Interest Income Recognized | 568 | [1] | 416 | [1] | 143 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 330 |  | 1,010 |  | 3,432 |
Unpaid Contractual Principal Balance | 453 |  | 2,331 |  | 6,022 |
Specific Allowance | 102 |  | 338 |  | 1,310 |
Average Investment in Impaired Loans | 525 |  | 1,441 |  | 5,071 |
Interest income recognized | 0 | [1] | 0 | [1] | 22 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 15,169 |  | 14,295 |  | 5,202 |
Unpaid Contractual Principal Balance | 16,888 |  | 17,815 |  | 8,523 |
Specific Allowance | 102 |  | 338 |  | 1,310 |
Average investment in impaired loans | 15,921 |  | 12,524 |  | 8,463 |
Interest Income Recognized | 568 | [1] | 416 | [1] | 165 | [1]
Real Estate Mortgage [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 1,024 |  | 695 |  |  |
Unpaid Contractual Principal Balance | 1,024 |  | 695 |  |  |
Specific Allowance | 0 |  | 0 |  |  |
Average Investment in Impaired Loans | 934 |  | 481 |  |  |
Interest Income Recognized | 43 | [1] | 30 | [1] |  |
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 1,024 |  | 695 |  |  |
Unpaid Contractual Principal Balance | 1,024 |  | 695 |  |  |
Specific Allowance | 0 |  | 0 |  |  |
Average investment in impaired loans | 934 |  | 481 |  |  |
Interest Income Recognized | $ 43 | [1] | $ 30 | [1] |  |
[1] | Cash basis interest is substantially the same as interest income recognized.

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