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Loans and Allowance for Loan Losses - Recorded Investment, Principal Balance and Related Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Recorded investment $ 80,832   $ 80,832   $ 58,979
Unpaid principal balances 81,076   81,076   59,354
Valuation allowance 2,328   2,328   2,198
Average recorded investment 75,149 $ 32,915 69,759 $ 33,197  
Cash payments received on nonaccrual loans 0   0 65  
Interest income recognized 0 16 0 65  
Impaired loans with an allowance:          
Financing Receivable, Impaired [Line Items]          
Recorded investment 37,876   37,876   24,921
Unpaid principal balances 38,032   38,032   25,114
Valuation allowance 2,328   2,328   2,198
Average recorded investment 33,450 17,364 30,607 14,378  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Commercial real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 16,667   16,667   1,850
Unpaid principal balances 16,698   16,698   1,863
Valuation allowance 1,092   1,092   95
Average recorded investment 12,527 395 8,968 410  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Consumer real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 12,577   12,577   8,028
Unpaid principal balances 12,624   12,624   8,079
Valuation allowance 433   433   410
Average recorded investment 11,066 4,437 10,053 4,058  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Construction and land development          
Financing Receivable, Impaired [Line Items]          
Recorded investment 1,737   1,737   2,522
Unpaid principal balances 1,738   1,738   2,528
Valuation allowance 33   33   66
Average recorded investment 1,059 77 1,547 79  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 6,032   6,032   12,521
Unpaid principal balances 6,086   6,086   12,644
Valuation allowance 588   588   1,627
Average recorded investment 7,976 11,778 9,491 9,203  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Consumer and other          
Financing Receivable, Impaired [Line Items]          
Recorded investment 863   863   0
Unpaid principal balances 886   886   0
Valuation allowance 182   182   0
Average recorded investment 822 677 548 628  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance:          
Financing Receivable, Impaired [Line Items]          
Recorded investment 42,956   42,956   34,058
Unpaid principal balances 43,044   43,044   34,240
Valuation allowance 0   0   0
Average recorded investment 41,699 15,551 39,152 18,819  
Interest income recognized 0 16 0 65  
Impaired loans without an allowance: | Commercial real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 22,601   22,601   16,364
Unpaid principal balances 22,684   22,684   16,514
Valuation allowance 0   0   0
Average recorded investment 18,493 2,599 17,783 2,502  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance: | Consumer real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 5,016   5,016   4,144
Unpaid principal balances 5,036   5,036   4,174
Valuation allowance 0   0   0
Average recorded investment 4,805 5,722 4,585 5,695  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance: | Construction and land development          
Financing Receivable, Impaired [Line Items]          
Recorded investment 0   0   2,645
Unpaid principal balances 0   0   2,650
Valuation allowance 0   0   0
Average recorded investment 0 1,031 882 1,730  
Cash payments received on nonaccrual loans   16      
Interest income recognized 0   0 65  
Impaired loans without an allowance: | Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 15,339   15,339   10,905
Unpaid principal balances 15,324   15,324   10,902
Valuation allowance 0   0   0
Average recorded investment 18,401 6,199 15,902 8,892  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance: | Consumer and other          
Financing Receivable, Impaired [Line Items]          
Recorded investment 0   0   0
Unpaid principal balances 0   0   0
Valuation allowance 0   0   $ 0
Average recorded investment 0 0 0 0  
Interest income recognized $ 0 $ 0 $ 0 $ 0