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Loans and Allowance for Loan Losses (Impaired Loan Portfolio) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired loans with a valuation allowance, Related Allowance $ 534 $ 461
Total impaired loans, Recorded Investment 3,559 2,657
Total impaired loans, Unpaid Principal Balance 3,652 2,826
Total impaired loans, Average Recorded Investment 3,358 2,005
Total impaired loans, Interest Income Recognized 111 129
All Other Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 2,354 1,427
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,387 1,462
Impaired loans without a valuation allowance, Average Recorded Investment 2,420 1,277
Impaired loans without a valuation allowance, Interest Income Recognized 71 63
Impaired loans with a valuation allowance, Recorded Investment 1,205 1,214
Impaired loans with a valuation allowance, Unpaid Principal Balance 1,265 1,241
Impaired loans with a valuation allowance, Related Allowance 534 445
Impaired loans with a valuation allowance, Average Recorded Investment 927 725
Impaired loans with a valuation allowance, Interest Income Recognized 40 50
All Other Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 636 424
Impaired loans without a valuation allowance, Unpaid Principal Balance 648 454
Impaired loans without a valuation allowance, Average Recorded Investment 855 204
Impaired loans without a valuation allowance, Interest Income Recognized 33 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 0 5
Impaired loans with a valuation allowance, Interest Income Recognized 0 1
All Other Loans [Member] | Consumer Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 1,073 415
Impaired loans without a valuation allowance, Unpaid Principal Balance 1,089 420
Impaired loans without a valuation allowance, Average Recorded Investment 934 401
Impaired loans without a valuation allowance, Interest Income Recognized 29 16
Impaired loans with a valuation allowance, Recorded Investment 163 1,007
Impaired loans with a valuation allowance, Unpaid Principal Balance 205 1,033
Impaired loans with a valuation allowance, Related Allowance 26 256
Impaired loans with a valuation allowance, Average Recorded Investment 365 601
Impaired loans with a valuation allowance, Interest Income Recognized 0 38
All Other 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
All Other Loans [Member] | Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 69 41
Impaired loans without a valuation allowance, Unpaid Principal Balance 70 41
Impaired loans without a valuation allowance, Average Recorded Investment 69 44
Impaired loans without a valuation allowance, Interest Income Recognized 6 3
Impaired loans with a valuation allowance, Recorded Investment 955 172
Impaired loans with a valuation allowance, Unpaid Principal Balance 973 172
Impaired loans with a valuation allowance, Related Allowance 442 172
Impaired loans with a valuation allowance, Average Recorded Investment 476 117
Impaired loans with a valuation allowance, Interest Income Recognized 37 10
All Other Loans [Member] | Consumer and Other [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans without a valuation allowance, Recorded Investment 29 0
Impaired loans without a valuation allowance, Unpaid Principal Balance 33 0
Impaired loans without a valuation allowance, Average Recorded Investment 15 0
Impaired loans without a valuation allowance, Interest Income Recognized 3 0
Impaired loans with a valuation allowance, Recorded Investment 87 12
Impaired loans with a valuation allowance, Unpaid Principal Balance 87 13
Impaired loans with a valuation allowance, Related Allowance 66 12
Impaired loans with a valuation allowance, Average Recorded Investment 86 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 0 16
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 123
Impaired loans with a valuation allowance, Related Allowance 0 16
Impaired loans with a valuation allowance, Average Recorded Investment 11 3
Impaired loans with a valuation allowance, Interest Income Recognized $ 0 $ 16