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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, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | $ 65,286 |  | $ 66,454 |  | $ 65,300 |
Unpaid Contractual Principal Balance | 68,227 |  | 72,539 |  | 68,228 |
Specific Allowance | 2,135 |  | 3,425 |  | 2,296 |
Average investment in impaired loans | 66,640 |  | 66,335 |  | 64,890 |
Interest Income Recognized | 443 | [1] | 532 | [1] | 2,083 | [1]
Commercial Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 5,430 |  | 5,155 |  | 5,457 |
Unpaid Contractual Principal Balance | 5,431 |  | 5,609 |  | 5,458 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 5,441 |  | 5,225 |  | 5,595 |
Interest Income Recognized | 50 | [1] | 74 | [1] | 240 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 4,278 |  | 6,073 |  | 4,353 |
Unpaid Contractual Principal Balance | 4,284 |  | 7,303 |  | 4,359 |
Specific Allowance | 939 |  | 1,911 |  | 1,189 |
Average Investment in Impaired Loans | 4,312 |  | 6,075 |  | 4,935 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 9,708 |  | 11,228 |  | 9,810 |
Unpaid Contractual Principal Balance | 9,715 |  | 12,912 |  | 9,817 |
Specific Allowance | 939 |  | 1,911 |  | 1,189 |
Average investment in impaired loans | 9,753 |  | 11,300 |  | 10,530 |
Interest Income Recognized | 50 | [1] | 74 | [1] | 240 | [1]
Commercial Secured by Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 35,719 |  | 33,765 |  | 35,258 |
Unpaid Contractual Principal Balance | 36,618 |  | 34,586 |  | 36,173 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 36,416 |  | 33,908 |  | 32,472 |
Interest Income Recognized | 265 | [1] | 297 | [1] | 1,231 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 4,234 |  | 4,158 |  | 4,039 |
Unpaid Contractual Principal Balance | 4,611 |  | 4,276 |  | 4,326 |
Specific Allowance | 1,084 |  | 1,192 |  | 1,005 |
Average Investment in Impaired Loans | 4,686 |  | 4,166 |  | 5,033 |
Interest income recognized | 4 | [1] | 0 | [1] | 1 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 39,953 |  | 37,923 |  | 39,297 |
Unpaid Contractual Principal Balance | 41,229 |  | 38,862 |  | 40,499 |
Specific Allowance | 1,084 |  | 1,192 |  | 1,005 |
Average investment in impaired loans | 41,102 |  | 38,074 |  | 37,505 |
Interest Income Recognized | 269 | [1] | 297 | [1] | 1,232 | [1]
Commercial Other [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 14,191 |  | 15,779 |  | 14,839 |
Unpaid Contractual Principal Balance | 15,726 |  | 17,920 |  | 16,435 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 14,324 |  | 15,435 |  | 15,396 |
Interest Income Recognized | 114 | [1] | 154 | [1] | 568 | [1]
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 413 |  | 867 |  | 330 |
Unpaid Contractual Principal Balance | 536 |  | 2,188 |  | 453 |
Specific Allowance | 112 |  | 322 |  | 102 |
Average Investment in Impaired Loans | 439 |  | 868 |  | 525 |
Interest income recognized | 0 | [1] | 0 | [1] | 0 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 14,604 |  | 16,646 |  | 15,169 |
Unpaid Contractual Principal Balance | 16,262 |  | 20,108 |  | 16,888 |
Specific Allowance | 112 |  | 322 |  | 102 |
Average investment in impaired loans | 14,763 |  | 16,303 |  | 15,921 |
Interest Income Recognized | 114 | [1] | 154 | [1] | 568 | [1]
Real Estate Mortgage [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance | 1,021 |  | 657 |  | 1,024 |
Unpaid Contractual Principal Balance | 1,021 |  | 657 |  | 1,024 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average Investment in Impaired Loans | 1,022 |  | 658 |  | 934 |
Interest Income Recognized | 10 | [1] | 7 | [1] | 43 | [1]
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance | 1,021 |  | 657 |  | 1,024 |
Unpaid Contractual Principal Balance | 1,021 |  | 657 |  | 1,024 |
Specific Allowance | 0 |  | 0 |  | 0 |
Average investment in impaired loans | 1,022 |  | 658 |  | 934 |
Interest Income Recognized | $ 10 | [1] | $ 7 | [1] | $ 43 | [1]
[1] | Cash basis interest is substantially the same as interest income recognized.

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