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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Recorded investment $ 70,982   $ 70,982   $ 83,146
Unpaid principal balances 71,084   71,084   83,337
Valuation allowance 3,608   3,608   3,964
Average recorded investment 73,649 $ 82,346 81,612 $ 73,284  
Interest income recognized 0 84 176 337  
Impaired loans with an allowance:          
Financing Receivable, Impaired [Line Items]          
Recorded investment 44,749   44,749   44,794
Unpaid principal balances 44,851   44,851   44,914
Valuation allowance 3,608   3,608   3,964
Average recorded investment 44,265 37,168 46,633 32,070  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Commercial real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 13,462   13,462   14,114
Unpaid principal balances 13,472   13,472   14,124
Valuation allowance 1,021   1,021   724
Average recorded investment 13,050 13,474 14,689 9,297  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Consumer real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 19,245   19,245   19,864
Unpaid principal balances 19,368   19,368   19,991
Valuation allowance 1,065   1,065   1,443
Average recorded investment 19,508 14,162 20,887 11,476  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Construction and land development          
Financing Receivable, Impaired [Line Items]          
Recorded investment 275   275   581
Unpaid principal balances 271   271   579
Valuation allowance 15   15   28
Average recorded investment 451 1,150 587 1,301  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 11,591   11,591   9,252
Unpaid principal balances 11,566   11,566   9,215
Valuation allowance 1,497   1,497   1,441
Average recorded investment 11,113 7,470 10,070 9,345  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Consumer and other          
Financing Receivable, Impaired [Line Items]          
Recorded investment 176   176   983
Unpaid principal balances 174   174   1,005
Valuation allowance 10   10   328
Average recorded investment 143 912 400 651  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance:          
Financing Receivable, Impaired [Line Items]          
Recorded investment 26,233   26,233   38,352
Unpaid principal balances 26,233   26,233   38,423
Valuation allowance 0   0   0
Average recorded investment 29,384 45,178 34,979 41,214  
Interest income recognized 0 84 176 337  
Impaired loans without an allowance: | Commercial real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 8,356   8,356   14,724
Unpaid principal balances 8,366   8,366   14,739
Valuation allowance 0   0   0
Average recorded investment 9,344 22,029 12,521 18,702  
Interest income recognized 0 84 176 337  
Impaired loans without an allowance: | Consumer real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 4,960   4,960   7,247
Unpaid principal balances 4,958   4,958   7,271
Valuation allowance 0   0   0
Average recorded investment 7,922 5,699 8,381 5,034  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance: | Construction and land development          
Financing Receivable, Impaired [Line Items]          
Recorded investment 20   20   1,786
Unpaid principal balances 19   19   1,786
Valuation allowance 0   0   0
Average recorded investment 10 1,442 452 1,382  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance: | Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 12,897   12,897   14,595
Unpaid principal balances 12,890   12,890   14,627
Valuation allowance 0   0   0
Average recorded investment 12,108 16,008 13,625 16,096  
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