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Loans and Allowance for Credit Losses (Aging of Past Due Financing Receivables) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 1,146,862 $ 1,081,295
Total past due 3,265 7,248
Nonaccrual 6,757 4,971
Total loans $ 1,156,884 $ 1,093,514
Percent of total loans, Current 99.10% 98.80%
Percent of total loans, Total past due 0.30% 0.70%
Percent of total loans, Nonaccrual 0.60% 0.50%
Percent of total loans, Total loans 100.00% 100.00%
Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due $ 1,828 $ 3,097
Percent of total loans, Total past due 0.20% 0.30%
Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due $ 1,437 $ 3,512
Percent of total loans, Total past due 0.10% 0.30%
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   $ 639
Percent of total loans, Total past due   0.10%
Residential Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 405,042 $ 394,653
Total past due 647 3,055
Nonaccrual 1,589 1,482
Total loans 407,278 399,190
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 433 1,589
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 214 1,045
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   421
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 493,503 460,998
Total past due 2,351 3,740
Nonaccrual 1,853 149
Total loans 497,707 464,887
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 1,130 1,061
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 1,221 2,461
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   218
Commercial Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 107,836 96,774
Total past due 60 173
Nonaccrual 333 337
Total loans 108,229 97,284
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 60 173
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 6,329 6,395
Total past due 23 12
Total loans 6,352 6,407
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 21 6
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 2 6
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 134,152 122,475
Total past due 184 268
Nonaccrual 2,982 3,003
Total loans 137,318 125,746
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due $ 184 $ 268