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Loans and Allowance for Loan Losses - Impaired Loan Portfolio (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired loans with a valuation allowance, Related Allowance $ 285 $ 461
Total impaired loans, Recorded Investment 3,620 2,657
Total impaired loans, Unpaid Principal Balance 3,763 2,826
Total impaired loans, Average Recorded Investment 3,129 2,005
Total impaired loans, Interest Income Recognized 84 129
Non PCI Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 2,813 1,427
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,837 1,462
Impaired loans without a valuation allowance, Average Recorded Investment 2,188 1,277
Impaired loans without a valuation allowance, Interest Income Recognized 55 63
Impaired loans with a valuation allowance, Recorded Investment 777 1,214
Impaired loans with a valuation allowance, Unpaid Principal Balance 799 1,241
Impaired loans with a valuation allowance, Related Allowance 266 445
Impaired loans with a valuation allowance, Average Recorded Investment 930 725
Impaired loans with a valuation allowance, Interest Income Recognized 26 50
Non PCI Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 1,198 424
Impaired loans without a valuation allowance, Unpaid Principal Balance 1,211 454
Impaired loans without a valuation allowance, Average Recorded Investment 802 204
Impaired loans without a valuation allowance, Interest Income Recognized 27 44
Impaired loans with a valuation allowance, Recorded Investment 0 23
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 23
Impaired loans with a valuation allowance, Related Allowance 0 5
Impaired loans with a valuation allowance, Average Recorded Investment 6 5
Impaired loans with a valuation allowance, Interest Income Recognized 0 1
Non PCI Loans [Member] | Consumer Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 981 415
Impaired loans without a valuation allowance, Unpaid Principal Balance 992 420
Impaired loans without a valuation allowance, Average Recorded Investment 769 401
Impaired loans without a valuation allowance, Interest Income Recognized 22 16
Impaired loans with a valuation allowance, Recorded Investment 376 1,007
Impaired loans with a valuation allowance, Unpaid Principal Balance 388 1,033
Impaired loans with a valuation allowance, Related Allowance 87 256
Impaired loans with a valuation allowance, Average Recorded Investment 576 601
Impaired loans with a valuation allowance, Interest Income Recognized 13 38
Non PCI Loans [Member] | Construction and Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 547 547
Impaired loans without a valuation allowance, Unpaid Principal Balance 547 547
Impaired loans without a valuation allowance, Average Recorded Investment 547 628
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
Non PCI Loans [Member] | Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 72 41
Impaired loans without a valuation allowance, Unpaid Principal Balance 73 41
Impaired loans without a valuation allowance, Average Recorded Investment 62 44
Impaired loans without a valuation allowance, Interest Income Recognized 5 3
Impaired loans with a valuation allowance, Recorded Investment 348 172
Impaired loans with a valuation allowance, Unpaid Principal Balance 354 172
Impaired loans with a valuation allowance, Related Allowance 142 172
Impaired loans with a valuation allowance, Average Recorded Investment 280 117
Impaired loans with a valuation allowance, Interest Income Recognized 10 10
Non PCI Loans [Member] | Consumer and Other [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 15 0
Impaired loans without a valuation allowance, Unpaid Principal Balance 14 0
Impaired loans without a valuation allowance, Average Recorded Investment 8 0
Impaired loans without a valuation allowance, Interest Income Recognized 1 0
Impaired loans with a valuation allowance, Recorded Investment 53 12
Impaired loans with a valuation allowance, Unpaid Principal Balance 57 13
Impaired loans with a valuation allowance, Related Allowance 37 12
Impaired loans with a valuation allowance, Average Recorded Investment 68 2
Impaired loans with a valuation allowance, Interest Income Recognized 3 1
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with a valuation allowance, Recorded Investment 30 16
Impaired loans with a valuation allowance, Unpaid Principal Balance 127 123
Impaired loans with a valuation allowance, Related Allowance 19 16
Impaired loans with a valuation allowance, Average Recorded Investment 11 3
Impaired loans with a valuation allowance, Interest Income Recognized $ 3 $ 16