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Loans (Summary of Nonperforming Loans) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Summary of nonperforming loans      
Total TDRs $ 99,428 $ 101,322 $ 104,383
Total loans $ 7,034,743 5,688,230 4,898,804
Minimum number of days accruing loans past due move to nonaccrual status 90 days    
Commercial Loan Portfolio [Member]      
Summary of nonperforming loans      
Total TDRs $ 74,751 77,047 80,696
Total loans 4,110,698 3,084,024 2,622,872
Consumer Loan Portfolio [Member]      
Summary of nonperforming loans      
Total TDRs 24,677 24,275 23,687
Total loans 2,924,045 2,604,206 2,275,932
Nonperforming [Member]      
Summary of nonperforming loans      
Total nonaccrual loans 51,215 50,644 55,635
Total accruing loans contractually past due 90 days or more as to interest or principal payments 1,779 2,073 1,535
Total TDRs 17,912 18,467 16,565
Total loans 70,906 71,184 73,735
Nonperforming [Member] | Commercial Loan Portfolio [Member]      
Summary of nonperforming loans      
Total TDRs 14,547 15,271 11,049
Nonperforming [Member] | Consumer Loan Portfolio [Member]      
Summary of nonperforming loans      
Total TDRs 3,365 3,196 5,516
Nonperforming [Member] | Commercial [Member]      
Summary of nonperforming loans      
Total nonaccrual loans 17,260 16,418 18,773
Total accruing loans contractually past due 90 days or more as to interest or principal payments 711 170 15
Nonperforming [Member] | Real estate commercial [Member]      
Summary of nonperforming loans      
Total nonaccrual loans 25,287 24,966 25,361
Total accruing loans contractually past due 90 days or more as to interest or principal payments 56 0 69
Nonperforming [Member] | Real Estate Construction Loans [Member]      
Summary of nonperforming loans      
Total nonaccrual loans 247 162 160
Total accruing loans contractually past due 90 days or more as to interest or principal payments 0 0 0
Nonperforming [Member] | Land Development Loans [Member]      
Summary of nonperforming loans      
Total nonaccrual loans 255 225 2,184
Total accruing loans contractually past due 90 days or more as to interest or principal payments 0 0 0
Nonperforming [Member] | Real estate residential [Member]      
Summary of nonperforming loans      
Total nonaccrual loans 6,004 6,706 6,325
Total accruing loans contractually past due 90 days or more as to interest or principal payments 424 557 376
Nonperforming [Member] | Consumer Installment Loans [Member]      
Summary of nonperforming loans      
Total nonaccrual loans 393 500 536
Total accruing loans contractually past due 90 days or more as to interest or principal payments 0 0 0
Nonperforming [Member] | Home Equity Loans [Member]      
Summary of nonperforming loans      
Total nonaccrual loans 1,769 1,667 2,296
Total accruing loans contractually past due 90 days or more as to interest or principal payments $ 588 $ 1,346 $ 1,075