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Loans (Summary of Nonperforming Loans) (Details) - Nonperforming - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Summary of nonperforming loans    
Total nonaccrual loans $ 63,095 $ 44,334
Other real estate owned and repossessed assets 8,807 17,187
Total nonperforming assets 71,902 61,521
Total accruing loans contractually past due 90 days or more as to interest or principal payments 1,377 1,283
Commercial Loan Portfolio | Commercial    
Summary of nonperforming loans    
Total nonaccrual loans 19,691 13,178
Total accruing loans contractually past due 90 days or more as to interest or principal payments 0 11
Commercial Loan Portfolio | Commercial real estate    
Summary of nonperforming loans    
Total nonaccrual loans 29,545 19,877
Total accruing loans contractually past due 90 days or more as to interest or principal payments 13 277
Commercial Loan Portfolio | Real estate construction and land development    
Summary of nonperforming loans    
Total nonaccrual loans 77 80
Consumer Loan Portfolio | Residential mortgage    
Summary of nonperforming loans    
Total nonaccrual loans 8,635 6,969
Total accruing loans contractually past due 90 days or more as to interest or principal payments 0 0
Consumer Loan Portfolio | Consumer installment    
Summary of nonperforming loans    
Total nonaccrual loans 842 879
Consumer Loan Portfolio | Home equity    
Summary of nonperforming loans    
Total nonaccrual loans 4,305 3,351
Total accruing loans contractually past due 90 days or more as to interest or principal payments $ 1,364 $ 995