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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, 2019
Mar. 31, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Recorded investment $ 96,004   $ 83,146
Unpaid principal balances 96,172   83,337
Valuation allowance 5,518   3,964
Average recorded investment 89,575 $ 64,223  
Interest income recognized 87 101  
Impaired loans with an allowance:      
Financing Receivable, Impaired [Line Items]      
Recorded investment 53,208   44,794
Unpaid principal balances 53,316   44,914
Valuation allowance 5,518   3,964
Average recorded investment 49,001 26,972  
Interest income recognized 0 0  
Impaired loans with an allowance: | Commercial real estate - mortgage      
Financing Receivable, Impaired [Line Items]      
Recorded investment 18,539   14,114
Unpaid principal balances 18,543   14,124
Valuation allowance 1,521   724
Average recorded investment 16,327 5,119  
Interest income recognized 0 0  
Impaired loans with an allowance: | Consumer real estate - mortgage      
Financing Receivable, Impaired [Line Items]      
Recorded investment 24,668   19,864
Unpaid principal balances 24,784   19,991
Valuation allowance 2,381   1,443
Average recorded investment 22,266 8,792  
Interest income recognized 0 0  
Impaired loans with an allowance: | Construction and land development      
Financing Receivable, Impaired [Line Items]      
Recorded investment 868   581
Unpaid principal balances 864   579
Valuation allowance 55   28
Average recorded investment 724 1,451  
Interest income recognized 0 0  
Impaired loans with an allowance: | Commercial and industrial      
Financing Receivable, Impaired [Line Items]      
Recorded investment 8,802   9,252
Unpaid principal balances 8,773   9,215
Valuation allowance 1,461   1,441
Average recorded investment 9,027 11,220  
Interest income recognized 0 0  
Impaired loans with an allowance: | Consumer and other      
Financing Receivable, Impaired [Line Items]      
Recorded investment 331   983
Unpaid principal balances 352   1,005
Valuation allowance 100   328
Average recorded investment 657 390  
Interest income recognized 0 0  
Impaired loans without an allowance:      
Financing Receivable, Impaired [Line Items]      
Recorded investment 42,796   38,352
Unpaid principal balances 42,856   38,423
Valuation allowance 0   0
Average recorded investment 40,574 37,251  
Interest income recognized 87 101  
Impaired loans without an allowance: | Commercial real estate - mortgage      
Financing Receivable, Impaired [Line Items]      
Recorded investment 16,674   14,724
Unpaid principal balances 16,678   14,739
Valuation allowance 0   0
Average recorded investment 15,699 15,375  
Interest income recognized 87 101  
Impaired loans without an allowance: | Consumer real estate - mortgage      
Financing Receivable, Impaired [Line Items]      
Recorded investment 10,431   7,247
Unpaid principal balances 10,466   7,271
Valuation allowance 0   0
Average recorded investment 8,839 4,369  
Interest income recognized 0 0  
Impaired loans without an allowance: | Construction and land development      
Financing Receivable, Impaired [Line Items]      
Recorded investment 0   1,786
Unpaid principal balances 0   1,786
Valuation allowance 0   0
Average recorded investment 893 1,322  
Interest income recognized 0 0  
Impaired loans without an allowance: | Commercial and industrial      
Financing Receivable, Impaired [Line Items]      
Recorded investment 15,691   14,595
Unpaid principal balances 15,712   14,627
Valuation allowance 0   0
Average recorded investment 15,143 16,185  
Interest income recognized 0 0  
Impaired loans without an allowance: | 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