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Loans and Allowance for Loan Losses - Impaired Loan Portfolio (Details) - Non PCI Loans [Member] - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment $ 1,016 $ 1,851
Impaired loans without a valuation allowance, Unpaid Principal Balance 1,027 1,879
Impaired loans without a valuation allowance, Average Recorded Investment 1,239 4,659
Impaired loans without a valuation allowance, Interest Income Recognized 20 180
Impaired loans with a valuation allowance, Recorded Investment 709 164
Impaired loans with a valuation allowance, Unpaid Principal Balance 734 243
Impaired loans with a valuation allowance, Related Allowance 175 4
Impaired loans with a valuation allowance, Average Recorded Investment 602 306
Impaired loans with a valuation allowance, Interest Income Recognized 27 70
Total impaired loans, Recorded Investment 1,725 2,015
Total impaired loans, Unpaid Principal Balance 1,761 2,122
Total impaired loans, Average Recorded Investment 1,841 4,965
Total impaired loans, Interest Income Recognized 47 250
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 118 119
Impaired loans without a valuation allowance, Unpaid Principal Balance 124 119
Impaired loans without a valuation allowance, Average Recorded Investment 149 1,311
Impaired loans without a valuation allowance, Interest Income Recognized 7 73
Impaired loans with a valuation allowance, Recorded Investment 0 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 0
Impaired loans with a valuation allowance, Related Allowance 0 0
Impaired loans with a valuation allowance, Average Recorded Investment 0 0
Impaired loans with a valuation allowance, Interest Income Recognized 0 0
Consumer Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 309 821
Impaired loans without a valuation allowance, Unpaid Principal Balance 314 849
Impaired loans without a valuation allowance, Average Recorded Investment 398 2,334
Impaired loans without a valuation allowance, Interest Income Recognized 11 100
Impaired loans with a valuation allowance, Recorded Investment 624 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 649 0
Impaired loans with a valuation allowance, Related Allowance 100 0
Impaired loans with a valuation allowance, Average Recorded Investment 499 0
Impaired loans with a valuation allowance, Interest Income Recognized 24 0
Construction and Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 547 865
Impaired loans without a valuation allowance, Unpaid Principal Balance 547 865
Impaired loans without a valuation allowance, Average Recorded Investment 648 967
Impaired loans without a valuation allowance, Interest Income Recognized 0 3
Impaired loans with a valuation allowance, Recorded Investment 0 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 0
Impaired loans with a valuation allowance, Related Allowance 0 0
Impaired loans with a valuation allowance, Average Recorded Investment 0 0
Impaired loans with a valuation allowance, Interest Income Recognized 0 0
Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 42 46
Impaired loans without a valuation allowance, Unpaid Principal Balance 42 46
Impaired loans without a valuation allowance, Average Recorded Investment 44 47
Impaired loans without a valuation allowance, Interest Income Recognized 2 4
Impaired loans with a valuation allowance, Recorded Investment 85 164
Impaired loans with a valuation allowance, Unpaid Principal Balance 85 243
Impaired loans with a valuation allowance, Related Allowance 75 4
Impaired loans with a valuation allowance, Average Recorded Investment 103 306
Impaired loans with a valuation allowance, Interest Income Recognized 3 70
Consumer and Other [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 0 0
Impaired loans without a valuation allowance, Unpaid Principal Balance 0 0
Impaired loans without a valuation allowance, Average Recorded Investment 0 0
Impaired loans without a valuation allowance, Interest Income Recognized 0 0
Impaired loans with a valuation allowance, Recorded Investment 0 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 0
Impaired loans with a valuation allowance, Related Allowance 0 0
Impaired loans with a valuation allowance, Average Recorded Investment 0 0
Impaired loans with a valuation allowance, Interest Income Recognized $ 0 $ 0