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Loans and Allowance for Loan Losses - Impaired Loan Portfolio (Details) - Non PCI Loans [Member] - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment $ 1,285 $ 1,851
Impaired loans without a valuation allowance, Unpaid Principal Balance 1,303 1,879
Impaired loans without a valuation allowance, Average Recorded Investment 1,570 4,659
Impaired loans without a valuation allowance, Interest Income Recognized 10 180
Impaired loans with a valuation allowance, Recorded Investment 789 164
Impaired loans with a valuation allowance, Unpaid Principal Balance 887 243
Impaired loans with a valuation allowance, Related Allowance 72 4
Impaired loans with a valuation allowance, Average Recorded Investment 477 306
Impaired loans with a valuation allowance, Interest Income Recognized 5 70
Total impaired loans, Recorded Investment 2,074 2,015
Total impaired loans, Unpaid Principal Balance 2,190 2,122
Total impaired loans, Average Recorded Investment 2,047 4,965
Total impaired loans, Interest Income Recognized 15 250
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 238 119
Impaired loans without a valuation allowance, Unpaid Principal Balance 241 119
Impaired loans without a valuation allowance, Average Recorded Investment 179 1,311
Impaired loans without a valuation allowance, Interest Income Recognized 3 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 368 821
Impaired loans without a valuation allowance, Unpaid Principal Balance 383 849
Impaired loans without a valuation allowance, Average Recorded Investment 595 2,334
Impaired loans without a valuation allowance, Interest Income Recognized 6 100
Impaired loans with a valuation allowance, Recorded Investment 625 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 644 0
Impaired loans with a valuation allowance, Related Allowance 68 0
Impaired loans with a valuation allowance, Average Recorded Investment 313 0
Impaired loans with a valuation allowance, Interest Income Recognized 5 0
Construction and Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 634 865
Impaired loans without a valuation allowance, Unpaid Principal Balance 634 865
Impaired loans without a valuation allowance, Average Recorded Investment 750 967
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 45 46
Impaired loans without a valuation allowance, Unpaid Principal Balance 45 46
Impaired loans without a valuation allowance, Average Recorded Investment 46 47
Impaired loans without a valuation allowance, Interest Income Recognized 1 4
Impaired loans with a valuation allowance, Recorded Investment 164 164
Impaired loans with a valuation allowance, Unpaid Principal Balance 243 243
Impaired loans with a valuation allowance, Related Allowance 4 4
Impaired loans with a valuation allowance, Average Recorded Investment 164 306
Impaired loans with a valuation allowance, Interest Income Recognized 0 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