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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Recorded investment $ 76,315   $ 76,315   $ 83,146
Unpaid principal balances 76,442   76,442   83,337
Valuation allowance 5,529   5,529   3,964
Average recorded investment 86,160 $ 75,149 85,155 $ 69,759  
Interest income recognized 89 153 176 253  
Impaired loans with an allowance:          
Financing Receivable, Impaired [Line Items]          
Recorded investment 43,780   43,780   44,794
Unpaid principal balances 43,875   43,875   44,914
Valuation allowance 5,529   5,529   3,964
Average recorded investment 48,494 33,450 47,261 30,607  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Commercial real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 12,639   12,639   14,114
Unpaid principal balances 12,640   12,640   14,124
Valuation allowance 778   778   724
Average recorded investment 15,589 12,527 15,097 8,968  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Consumer real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 19,770   19,770   19,864
Unpaid principal balances 19,879   19,879   19,991
Valuation allowance 2,148   2,148   1,443
Average recorded investment 22,219 11,066 21,434 10,053  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Construction and land development          
Financing Receivable, Impaired [Line Items]          
Recorded investment 626   626   581
Unpaid principal balances 621   621   579
Valuation allowance 43   43   28
Average recorded investment 747 1,059 692 1,547  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 10,634   10,634   9,252
Unpaid principal balances 10,601   10,601   9,215
Valuation allowance 2,560   2,560   1,441
Average recorded investment 9,718 7,976 9,563 9,491  
Interest income recognized 0 0 0 0  
Impaired loans with an allowance: | Consumer and other          
Financing Receivable, Impaired [Line Items]          
Recorded investment 111   111   983
Unpaid principal balances 134   134   1,005
Valuation allowance 0   0   328
Average recorded investment 221 822 475 548  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance:          
Financing Receivable, Impaired [Line Items]          
Recorded investment 32,535   32,535   38,352
Unpaid principal balances 32,567   32,567   38,423
Valuation allowance 0   0   0
Average recorded investment 37,666 41,699 37,894 39,152  
Interest income recognized 89 153 176 253  
Impaired loans without an allowance: | Commercial real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 10,332   10,332   14,724
Unpaid principal balances 10,341   10,341   14,739
Valuation allowance 0   0   0
Average recorded investment 13,503 18,493 13,910 17,783  
Interest income recognized 89 153 176 253  
Impaired loans without an allowance: | Consumer real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 10,885   10,885   7,247
Unpaid principal balances 10,909   10,909   7,271
Valuation allowance 0   0   0
Average recorded investment 10,658 4,805 9,521 4,585  
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   1,786
Unpaid principal balances 0   0   1,786
Valuation allowance 0   0   0
Average recorded investment 0 0 595 882  
Interest income recognized 0 0 0 0  
Impaired loans without an allowance: | Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 11,318   11,318   14,595
Unpaid principal balances 11,317   11,317   14,627
Valuation allowance 0   0   0
Average recorded investment 13,505 18,401 13,868 15,902  
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