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Loans and Allowance for Loan Losses - Impaired Loan Portfolio (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Impaired loans with a valuation allowance, Related Allowance $ 274 $ 534
Total impaired loans, Recorded Investment 6,243 3,559
Total impaired loans, Unpaid Principal Balance 6,768 3,652
Total impaired loans, Average Recorded Investment 4,295 3,358
Total impaired loans, Interest Income Recognized 29 111
Non PCI Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 2,109 2,354
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,142 2,387
Impaired loans without a valuation allowance, Average Recorded Investment 2,231 2,420
Impaired loans without a valuation allowance, Interest Income Recognized 26 71
Impaired loans with a valuation allowance, Recorded Investment 498 1,205
Impaired loans with a valuation allowance, Unpaid Principal Balance 518 1,265
Impaired loans with a valuation allowance, Related Allowance 220 534
Impaired loans with a valuation allowance, Average Recorded Investment 852 927
Impaired loans with a valuation allowance, Interest Income Recognized 10 40
Non PCI Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 589 636
Impaired loans without a valuation allowance, Unpaid Principal Balance 601 648
Impaired loans without a valuation allowance, Average Recorded Investment 613 855
Impaired loans without a valuation allowance, Interest Income Recognized 20 33
Impaired loans with a valuation allowance, Recorded Investment 47 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 47 0
Impaired loans with a valuation allowance, Related Allowance 11 0
Impaired loans with a valuation allowance, Average Recorded Investment 24 0
Impaired loans with a valuation allowance, Interest Income Recognized 1 0
Non PCI Loans [Member] | Consumer Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 863 1,073
Impaired loans without a valuation allowance, Unpaid Principal Balance 879 1,089
Impaired loans without a valuation allowance, Average Recorded Investment 967 934
Impaired loans without a valuation allowance, Interest Income Recognized 4 29
Impaired loans with a valuation allowance, Recorded Investment 35 163
Impaired loans with a valuation allowance, Unpaid Principal Balance 40 205
Impaired loans with a valuation allowance, Related Allowance 33 26
Impaired loans with a valuation allowance, Average Recorded Investment 99 365
Impaired loans with a valuation allowance, Interest Income Recognized 0 0
Non PCI Loans [Member] | Construction and Land Development [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 599 547
Impaired loans without a valuation allowance, Unpaid Principal Balance 599 547
Impaired loans without a valuation allowance, Average Recorded Investment 573 547
Impaired loans without a valuation allowance, Interest Income Recognized 0 0
Impaired loans with a valuation allowance, Recorded Investment 56 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 56 0
Impaired loans with a valuation allowance, Related Allowance 8 0
Impaired loans with a valuation allowance, Average Recorded Investment 28 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 31 69
Impaired loans without a valuation allowance, Unpaid Principal Balance 32 70
Impaired loans without a valuation allowance, Average Recorded Investment 50 69
Impaired loans without a valuation allowance, Interest Income Recognized 1 6
Impaired loans with a valuation allowance, Recorded Investment 334 955
Impaired loans with a valuation allowance, Unpaid Principal Balance 349 973
Impaired loans with a valuation allowance, Related Allowance 164 442
Impaired loans with a valuation allowance, Average Recorded Investment 644 476
Impaired loans with a valuation allowance, Interest Income Recognized 9 37
Non PCI Loans [Member] | Consumer and Other [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 27 29
Impaired loans without a valuation allowance, Unpaid Principal Balance 31 33
Impaired loans without a valuation allowance, Average Recorded Investment 28 15
Impaired loans without a valuation allowance, Interest Income Recognized 1 3
Impaired loans with a valuation allowance, Recorded Investment 26 87
Impaired loans with a valuation allowance, Unpaid Principal Balance 26 87
Impaired loans with a valuation allowance, Related Allowance 4 66
Impaired loans with a valuation allowance, Average Recorded Investment 57 86
Impaired loans with a valuation allowance, Interest Income Recognized 0 3
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with a valuation allowance, Recorded Investment 2,535 0
Impaired loans with a valuation allowance, Unpaid Principal Balance 2,837 0
Impaired loans with a valuation allowance, Related Allowance 40 0
Impaired loans with a valuation allowance, Average Recorded Investment 845 11
Impaired loans with a valuation allowance, Interest Income Recognized (10) $ 0
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with a valuation allowance, Recorded Investment 1,101  
Impaired loans with a valuation allowance, Unpaid Principal Balance 1,271  
Impaired loans with a valuation allowance, Related Allowance 14  
Impaired loans with a valuation allowance, Average Recorded Investment 367  
Impaired loans with a valuation allowance, Interest Income Recognized $ 3