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Loans and Allowance for Loan Losses - Aging of recorded investment in past due loans (Details 7) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Aging of the recorded investment in past due loans      
Total loans $ 4,189,368 $ 4,175,008 $ 4,119,235
Loans Receivable
      
Aging of the recorded investment in past due loans      
Loans Past Due, 30 - 59 Days 19,265 27,732 29,659
Loans Past Due, 60 - 89 Days 5,942 8,266 7,465
Loans Past Due, Greater than 90 Days Past Due 9,407 23,129 31,585
Loans, Total Past Due 34,614 59,127 68,709
Loans Not Past Due 4,154,754 4,115,881 4,050,526
Total loans 4,189,368 4,175,008 4,119,235
Loans Receivable | Commercial (secured by real estate)
      
Aging of the recorded investment in past due loans      
Loans Past Due, 30 - 59 Days 3,541 8,106 7,053
Loans Past Due, 60 - 89 Days 696 3,232 1,342
Loans Past Due, Greater than 90 Days Past Due 2,136 7,476 11,996
Loans, Total Past Due 6,373 18,814 20,391
Loans Not Past Due 1,741,772 1,794,551 1,816,086
Total loans 1,748,145 1,813,365 1,836,477
Loans Receivable | Commercial & industrial
      
Aging of the recorded investment in past due loans      
Loans Past Due, 30 - 59 Days 1,123 1,565 663
Loans Past Due, 60 - 89 Days 500 429 1,496
Loans Past Due, Greater than 90 Days Past Due 145 867 389
Loans, Total Past Due 1,768 2,861 2,548
Loans Not Past Due 435,220 455,385 447,674
Total loans 436,988 458,246 450,222
Loans Receivable | Commercial construction
      
Aging of the recorded investment in past due loans      
Loans Past Due, 30 - 59 Days 1,128 2,216 3,555
Loans Past Due, 60 - 89 Days 235    133
Loans Past Due, Greater than 90 Days Past Due 196 4,490 950
Loans, Total Past Due 1,559 6,706 4,638
Loans Not Past Due 131,003 148,063 164,700
Total loans 132,562 154,769 169,338
Loans Receivable | Commercial
      
Aging of the recorded investment in past due loans      
Loans Past Due, 30 - 59 Days 5,792 11,887 11,271
Loans Past Due, 60 - 89 Days 1,431 3,661 2,971
Loans Past Due, Greater than 90 Days Past Due 2,477 12,833 13,335
Loans, Total Past Due 9,700 28,381 27,577
Loans Not Past Due 2,307,995 2,397,999 2,428,460
Total loans 2,317,695 2,426,380 2,456,037
Loans Receivable | Residential mortgage
      
Aging of the recorded investment in past due loans      
Loans Past Due, 30 - 59 Days 10,543 12,292 12,636
Loans Past Due, 60 - 89 Days 3,993 2,426 2,980
Loans Past Due, Greater than 90 Days Past Due 5,639 4,848 6,756
Loans, Total Past Due 20,175 19,566 22,372
Loans Not Past Due 1,258,384 1,194,637 1,105,964
Total loans 1,278,559 1,214,203 1,128,336
Loans Receivable | Residential construction
      
Aging of the recorded investment in past due loans      
Loans Past Due, 30 - 59 Days 2,037 2,233 4,781
Loans Past Due, 60 - 89 Days 335 1,934 1,189
Loans Past Due, Greater than 90 Days Past Due 1,261 5,159 11,096
Loans, Total Past Due 3,633 9,326 17,066
Loans Not Past Due 328,048 372,351 391,900
Total loans 331,681 381,677 408,966
Loans Receivable | Consumer installment
      
Aging of the recorded investment in past due loans      
Loans Past Due, 30 - 59 Days 893 1,320 971
Loans Past Due, 60 - 89 Days 183 245 325
Loans Past Due, Greater than 90 Days Past Due 30 289 398
Loans, Total Past Due 1,106 1,854 1,694
Loans Not Past Due 260,327 150,894 124,202
Total loans $ 261,433 $ 152,748 $ 125,896