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Loans and Allowance for Loan Losses - Impaired Loan Portfolio (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired loans with a valuation allowance, Related Allowance $ 354 $ 461
Total impaired loans, Recorded Investment 3,232 2,657
Total impaired loans, Unpaid Principal Balance 3,390 2,826
Total impaired loans, Average Recorded Investment 2,963 2,005
Total impaired loans, Interest Income Recognized 51 129
Non PCI Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 2,471 1,427
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,512 1,462
Impaired loans without a valuation allowance, Average Recorded Investment 1,979 1,277
Impaired loans without a valuation allowance, Interest Income Recognized 30 63
Impaired loans with a valuation allowance, Recorded Investment 734 1,214
Impaired loans with a valuation allowance, Unpaid Principal Balance 751 1,241
Impaired loans with a valuation allowance, Related Allowance 335 445
Impaired loans with a valuation allowance, Average Recorded Investment 979 725
Impaired loans with a valuation allowance, Interest Income Recognized 18 50
Non PCI Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 1,034 424
Impaired loans without a valuation allowance, Unpaid Principal Balance 1,043 454
Impaired loans without a valuation allowance, Average Recorded Investment 670 204
Impaired loans without a valuation allowance, Interest Income Recognized 15 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 8 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 793 415
Impaired loans without a valuation allowance, Unpaid Principal Balance 823 420
Impaired loans without a valuation allowance, Average Recorded Investment 699 401
Impaired loans without a valuation allowance, Interest Income Recognized 12 16
Impaired loans with a valuation allowance, Recorded Investment 203 1,007
Impaired loans with a valuation allowance, Unpaid Principal Balance 216 1,033
Impaired loans with a valuation allowance, Related Allowance 37 256
Impaired loans with a valuation allowance, Average Recorded Investment 642 601
Impaired loans with a valuation allowance, Interest Income Recognized 11 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 81 41
Impaired loans without a valuation allowance, Unpaid Principal Balance 83 41
Impaired loans without a valuation allowance, Average Recorded Investment 58 44
Impaired loans without a valuation allowance, Interest Income Recognized 3 3
Impaired loans with a valuation allowance, Recorded Investment 438 172
Impaired loans with a valuation allowance, Unpaid Principal Balance 440 172
Impaired loans with a valuation allowance, Related Allowance 222 172
Impaired loans with a valuation allowance, Average Recorded Investment 257 117
Impaired loans with a valuation allowance, Interest Income Recognized 5 10
Non PCI Loans [Member] | Consumer and Other [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 16 0
Impaired loans without a valuation allowance, Unpaid Principal Balance 16 0
Impaired loans without a valuation allowance, Average Recorded Investment 5 0
Impaired loans without a valuation allowance, Interest Income Recognized 0 0
Impaired loans with a valuation allowance, Recorded Investment 93 12
Impaired loans with a valuation allowance, Unpaid Principal Balance 95 13
Impaired loans with a valuation allowance, Related Allowance 76 12
Impaired loans with a valuation allowance, Average Recorded Investment 72 2
Impaired loans with a valuation allowance, Interest Income Recognized 2 1
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with a valuation allowance, Recorded Investment 27 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 5 3
Impaired loans with a valuation allowance, Interest Income Recognized $ 3 $ 16