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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Total impaired loans [Abstract]          
Recorded balance $ 63,292 $ 60,891 $ 63,292 $ 60,891 $ 62,498
Unpaid Contractual Principal Balance 68,218 66,227 68,218 66,227 68,596
Specific Allowance 3,280 3,574 3,280 3,574 3,248
Average investment in impaired loans 63,739 61,455 64,574 62,151 62,624
Interest Income Recognized 624 [1] 441 [1] 1,613 [1] 1,251 [1] 1,880 [1]
Commercial Construction [Member]
          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 5,586 3,032 5,586 3,032 3,692
Unpaid Contractual Principal Balance 6,163 3,032 6,163 3,032 4,146
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 5,597 3,034 5,622 4,072 4,249
Interest Income Recognized 77 [1] 32 [1] 204 [1] 90 [1] 97 [1]
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 4,557 7,070 4,557 7,070 5,703
Unpaid Contractual Principal Balance 4,563 8,298 4,563 8,298 6,933
Specific Allowance 1,827 2,321 1,827 2,321 1,820
Average Investment in Impaired Loans 4,572 7,355 5,101 6,881 6,585
Interest income recognized 0 [1] 0 [1] 0 [1] 0 [1] 0 [1]
Total impaired loans [Abstract]          
Recorded balance 10,143 10,102 10,143 10,102 9,395
Unpaid Contractual Principal Balance 10,726 11,330 10,726 11,330 11,079
Specific Allowance 1,827 2,321 1,827 2,321 1,820
Average investment in impaired loans 10,169 10,389 10,723 10,953 10,834
Interest Income Recognized 77 [1] 32 [1] 204 [1] 90 [1] 97 [1]
Commercial Secured by Real Estate [Member]
          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 31,054 34,099 31,054 34,099 35,046
Unpaid Contractual Principal Balance 31,929 34,586 31,929 34,586 35,818
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 31,142 34,229 31,491 35,566 35,542
Interest Income Recognized 405 [1] 291 [1] 938 [1] 976 [1] 1,337 [1]
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 5,423 3,406 5,423 3,406 3,067
Unpaid Contractual Principal Balance 5,733 3,530 5,733 3,530 3,189
Specific Allowance 1,295 938 1,295 938 1,090
Average Investment in Impaired Loans 5,622 3,436 5,362 3,293 3,243
Interest income recognized 0 [1] 0 [1] 0 [1] 0 [1] 0 [1]
Total impaired loans [Abstract]          
Recorded balance 36,477 37,505 36,477 37,505 38,113
Unpaid Contractual Principal Balance 37,662 38,116 37,662 38,116 39,007
Specific Allowance 1,295 938 1,295 938 1,090
Average investment in impaired loans 36,764 37,665 36,853 38,859 38,785
Interest Income Recognized 405 [1] 291 [1] 938 [1] 976 [1] 1,337 [1]
Commercial Other [Member]
          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 15,179 11,643 15,179 11,643 13,285
Unpaid Contractual Principal Balance 18,212 13,819 18,212 13,819 15,484
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 15,264 11,756 15,508 10,348 11,083
Interest Income Recognized 134 [1] 108 [1] 439 [1] 167 [1] 416 [1]
Loans with a specific valuation allowance [Abstract]          
Recorded Balance 465 975 465 975 1,010
Unpaid Contractual Principal Balance 590 2,295 590 2,295 2,331
Specific Allowance 158 315 158 315 338
Average Investment in Impaired Loans 515 977 587 1,582 1,441
Interest income recognized 0 [1] 0 [1] 0 [1] 0 [1] 0 [1]
Total impaired loans [Abstract]          
Recorded balance 15,644 12,618 15,644 12,618 14,295
Unpaid Contractual Principal Balance 18,802 16,114 18,802 16,114 17,815
Specific Allowance 158 315 158 315 338
Average investment in impaired loans 15,779 12,733 16,095 11,930 12,524
Interest Income Recognized 134 [1] 108 [1] 439 [1] 167 [1] 416 [1]
Real Estate Mortgage [Member]
          
Loans without a specific valuation allowance [Abstract]          
Recorded Balance 1,028 666 1,028 666 695
Unpaid Contractual Principal Balance 1,028 667 1,028 667 695
Specific Allowance 0 0 0 0 0
Average Investment in Impaired Loans 1,027 668 903 409 481
Interest Income Recognized 8 [1] 10 [1] 32 [1] 18 [1] 30 [1]
Total impaired loans [Abstract]          
Recorded balance 1,028 666 1,028 666 695
Unpaid Contractual Principal Balance 1,028 667 1,028 667 695
Specific Allowance 0 0 0 0 0
Average investment in impaired loans 1,027 668 903 409 481
Interest Income Recognized $ 8 [1] $ 10 [1] $ 32 [1] $ 18 [1] $ 30 [1]
[1] Cash basis interest is substantially the same as interest income recognized.