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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Recorded investment $ 40,216   $ 40,216   $ 27,577
Unpaid principal balances [1] 48,501   48,501   31,612
Valuation allowance [2] 1,405   1,405   1,071
Average recorded investment 26,741 $ 37,004 26,670 $ 36,629  
Interest income recognized 16 41 65 88  
Collateral dependent nonaccrual loans:          
Financing Receivable, Impaired [Line Items]          
Recorded investment 32,278   32,278   14,689
Unpaid principal balances [1] 39,796   39,796   14,769
Valuation allowance [2] 0   0   0
Average recorded investment 17,026 27,585 15,434 27,220  
Interest income recognized 16 41 65 88  
Collateral dependent nonaccrual loans: | Commercial real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 9,532   9,532   2,308
Unpaid principal balances [1] 12,824   12,824   2,312
Valuation allowance [2] 0   0   0
Average recorded investment 4,019 3,845 3,298 3,474  
Interest income recognized 0 0 0 0  
Collateral dependent nonaccrual loans: | Consumer real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 14,539   14,539   2,880
Unpaid principal balances [1] 17,508   17,508   2,915
Valuation allowance [2] 0   0   0
Average recorded investment 6,000 4,125 5,188 4,140  
Interest income recognized 0 0 0 0  
Collateral dependent nonaccrual loans: | Construction and land development          
Financing Receivable, Impaired [Line Items]          
Recorded investment 1,935   1,935   3,128
Unpaid principal balances [1] 2,192   2,192   3,135
Valuation allowance [2] 0   0   0
Average recorded investment 665 7,125 592 7,293  
Interest income recognized 16 41 65 88  
Collateral dependent nonaccrual loans: | Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 6,270   6,270   6,373
Unpaid principal balances [1] 7,270   7,270   6,407
Valuation allowance [2] 0   0   0
Average recorded investment 6,341 12,107 6,356 11,928  
Interest income recognized 0 0 0 0  
Collateral dependent nonaccrual loans: | Consumer and other          
Financing Receivable, Impaired [Line Items]          
Recorded investment 2   2   0
Unpaid principal balances [1] 2   2   0
Valuation allowance [2] 0   0   0
Average recorded investment 1 383 0 385  
Interest income recognized 0 0 0 0  
Cash flow dependent nonaccrual loans:          
Financing Receivable, Impaired [Line Items]          
Recorded investment 7,938   7,938   12,888
Unpaid principal balances [1] 8,705   8,705   16,843
Valuation allowance [2] 1,405   1,405   1,071
Average recorded investment 9,715 9,419 11,236 9,409  
Interest income recognized 0 0 0 0  
Cash flow dependent nonaccrual loans: | Commercial real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 584   584   2,613
Unpaid principal balances [1] 810   810   3,349
Valuation allowance [2] 38   38   59
Average recorded investment 619 1,352 1,166 725  
Interest income recognized 0 0 0 0  
Cash flow dependent nonaccrual loans: | Consumer real estate - mortgage          
Financing Receivable, Impaired [Line Items]          
Recorded investment 4,025   4,025   5,193
Unpaid principal balances [1] 4,077   4,077   5,775
Valuation allowance [2] 941   941   688
Average recorded investment 4,126 3,163 4,197 3,181  
Interest income recognized 0 0 0 0  
Cash flow dependent nonaccrual loans: | Construction and land development          
Financing Receivable, Impaired [Line Items]          
Recorded investment 1,938   1,938   3,485
Unpaid principal balances [1] 2,384   2,384   4,154
Valuation allowance [2] 22   22   20
Average recorded investment 1,928 130 2,119 134  
Interest income recognized 0 0 0 0  
Cash flow dependent nonaccrual loans: | Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 938   938   1,122
Unpaid principal balances [1] 936   936   2,714
Valuation allowance [2] 172   172   77
Average recorded investment 1,221 1,838 1,345 2,396  
Interest income recognized 0 0 0 0  
Cash flow dependent nonaccrual loans: | Consumer and other          
Financing Receivable, Impaired [Line Items]          
Recorded investment 453   453   475
Unpaid principal balances [1] 498   498   851
Valuation allowance [2] 232   232   $ 227
Average recorded investment 1,821 2,936 2,409 2,973  
Interest income recognized $ 0 $ 0 $ 0 $ 0  
[1] Unpaid principal balance presented net of fair value adjustments recorded in conjunction with purchase accounting.
[2] Collateral dependent loans are typically charged-off to their net realizable value and no specific allowance is carried related to those loans.