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Loans (Summary of Nonperforming Loans) (Details) - Nonperforming - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Summary of nonperforming loans    
Total nonaccrual loans $ 44,334 $ 62,225
Other real estate owned and repossessed assets 17,187 9,935
Total nonperforming assets 61,521 72,160
Total accruing loans contractually past due 90 days or more as to interest or principal payments 1,283 2,287
Commercial Loan Portfolio | Commercial    
Summary of nonperforming loans    
Total nonaccrual loans 13,178 28,554
Total accruing loans contractually past due 90 days or more as to interest or principal payments 11 364
Commercial Loan Portfolio | Commercial real estate    
Summary of nonperforming loans    
Total nonaccrual loans 19,877 25,163
Total accruing loans contractually past due 90 days or more as to interest or principal payments 277 254
Commercial Loan Portfolio | Real estate construction and land development    
Summary of nonperforming loans    
Total nonaccrual loans 80 521
Consumer Loan Portfolio | Residential mortgage    
Summary of nonperforming loans    
Total nonaccrual loans 6,969 5,557
Total accruing loans contractually past due 90 days or more as to interest or principal payments 0 402
Consumer Loan Portfolio | Consumer installment    
Summary of nonperforming loans    
Total nonaccrual loans 879 451
Consumer Loan Portfolio | Home equity    
Summary of nonperforming loans    
Total nonaccrual loans 3,351 1,979
Total accruing loans contractually past due 90 days or more as to interest or principal payments $ 995 $ 1,267