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Loans and Allowance for Loan Losses - Recorded Investment, Principal Balance and Related Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Recorded investment $ 83,861   $ 83,861   $ 58,979
Unpaid principal balances 84,041   84,041   59,354
Valuation allowance 2,378   2,378   2,198
Average recorded investment 82,346 $ 39,516 73,284 $ 36,293  
Interest income recognized 0 0 0 65  
Impaired loans with an allowance:          
Financing Receivable, Impaired [Line Items]          
Recorded investment 36,460   36,460   24,921
Unpaid principal balances 36,596   36,596   25,114
Valuation allowance 2,378   2,378   2,198
Average recorded investment 37,168 17,535 32,070 15,258  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Commercial real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 10,282   10,282   1,850
Unpaid principal balances 10,305   10,305   1,863
Valuation allowance 461   461   95
Average recorded investment 13,474 264 9,297 350  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Consumer real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 15,746   15,746   8,028
Unpaid principal balances 15,808   15,808   8,079
Valuation allowance 490   490   410
Average recorded investment 14,162 4,593 11,476 4,230  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Construction and land development          
Financing Receivable, Impaired [Line Items]          
Recorded investment 563   563   2,522
Unpaid principal balances 564   564   2,528
Valuation allowance 15   15   66
Average recorded investment 1,150 81 1,301 78  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 8,908   8,908   12,521
Unpaid principal balances 8,939   8,939   12,644
Valuation allowance 1,265   1,265   1,627
Average recorded investment 7,470 12,235 9,345 10,068  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Consumer and other          
Financing Receivable, Impaired [Line Items]          
Recorded investment 961   961   0
Unpaid principal balances 980   980   0
Valuation allowance 147   147   0
Average recorded investment 912 362 651 532  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance:          
Financing Receivable, Impaired [Line Items]          
Recorded investment 47,401   47,401   34,058
Unpaid principal balances 47,445   47,445   34,240
Valuation allowance 0   0   0
Average recorded investment 45,178 21,981 41,214 21,035  
Interest income recognized 0 0 0 65  
Impaired loans without an allowance: | Commercial real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 21,457   21,457   16,364
Unpaid principal balances 21,481   21,481   16,514
Valuation allowance 0   0   0
Average recorded investment 22,029 6,981 18,702 4,638  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance: | Consumer real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 6,382   6,382   4,144
Unpaid principal balances 6,419   6,419   4,174
Valuation allowance 0   0   0
Average recorded investment 5,699 7,003 5,034 6,122  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance: | Construction and land development          
Financing Receivable, Impaired [Line Items]          
Recorded investment 2,884   2,884   2,645
Unpaid principal balances 2,883   2,883   2,650
Valuation allowance 0   0   0
Average recorded investment 1,442 1,324 1,382 1,702  
Interest income recognized 0 0 0 65  
Impaired loans without an allowance: | Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 16,678   16,678   10,905
Unpaid principal balances 16,662   16,662   10,902
Valuation allowance 0   0   0
Average recorded investment 16,008 6,673 16,096 8,573  
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