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Loans and Allowance for Loan Losses - Recorded Investment, Principal Balance and Related Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Recorded investment $ 108,337   $ 101,634
Unpaid principal balances 138,717   133,747
Valuation allowance 2,804   2,317
Average recorded investment 104,989 $ 41,113  
Interest income recognized 0 49  
Collateral dependent impaired loans:      
Financing Receivable, Impaired [Line Items]      
Recorded investment 56,079   50,712
Unpaid principal balances 76,953   71,881
Valuation allowance 2,040   521
Average recorded investment 53,396 12,706  
Interest income recognized 0 49  
Collateral dependent impaired loans: | Commercial real estate - mortgage      
Financing Receivable, Impaired [Line Items]      
Recorded investment 36,258   33,073
Unpaid principal balances 43,809   40,771
Valuation allowance 778   38
Average recorded investment 34,666 2,100  
Interest income recognized 0 0  
Collateral dependent impaired loans: | Consumer real estate - mortgage      
Financing Receivable, Impaired [Line Items]      
Recorded investment 5,166   6,314
Unpaid principal balances 7,233   8,560
Valuation allowance 0   115
Average recorded investment 5,740 2,216  
Interest income recognized 0 0  
Collateral dependent impaired loans: | Construction and land development      
Financing Receivable, Impaired [Line Items]      
Recorded investment 5,939   8,513
Unpaid principal balances 11,537   14,115
Valuation allowance 0   6
Average recorded investment 7,226 2,078  
Interest income recognized 0 49  
Collateral dependent impaired loans: | Commercial and industrial      
Financing Receivable, Impaired [Line Items]      
Recorded investment 8,716   2,812
Unpaid principal balances 14,374   8,435
Valuation allowance 1,262   362
Average recorded investment 5,764 6,312  
Interest income recognized 0 0  
Collateral dependent impaired loans: | Consumer and other      
Financing Receivable, Impaired [Line Items]      
Recorded investment 0   0
Unpaid principal balances 0   0
Valuation allowance 0   0
Average recorded investment 0 0  
Interest income recognized 0 0  
Cash flow dependent impaired loans:      
Financing Receivable, Impaired [Line Items]      
Recorded investment 52,258   50,922
Unpaid principal balances 61,764   61,866
Valuation allowance 764   1,796
Average recorded investment 51,593 28,407  
Interest income recognized 0 0  
Cash flow dependent impaired loans: | Commercial real estate - mortgage      
Financing Receivable, Impaired [Line Items]      
Recorded investment 6,808   5,944
Unpaid principal balances 9,106   8,237
Valuation allowance 93   95
Average recorded investment 6,376 2,597  
Interest income recognized 0 0  
Cash flow dependent impaired loans: | Consumer real estate - mortgage      
Financing Receivable, Impaired [Line Items]      
Recorded investment 20,200   19,904
Unpaid principal balances 23,370   23,387
Valuation allowance 296   411
Average recorded investment 19,941 9,393  
Interest income recognized 0 0  
Cash flow dependent impaired loans: | Construction and land development      
Financing Receivable, Impaired [Line Items]      
Recorded investment 1,017   3,222
Unpaid principal balances 1,883   4,184
Valuation allowance 13   12
Average recorded investment 2,120 3,288  
Interest income recognized 0 0  
Cash flow dependent impaired loans: | Commercial and industrial      
Financing Receivable, Impaired [Line Items]      
Recorded investment 23,451   21,852
Unpaid principal balances 26,595   26,058
Valuation allowance 152   1,278
Average recorded investment 22,669 12,440  
Interest income recognized 0 0  
Cash flow dependent impaired loans: | Consumer and other      
Financing Receivable, Impaired [Line Items]      
Recorded investment 782   0
Unpaid principal balances 810   0
Valuation allowance 210   $ 0
Average recorded investment 487 689  
Interest income recognized $ 0 $ 0