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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance $ 17,901   $ 19,266
Recorded investment with no allowance 8,838   10,977
Recorded investment with an allowance 7,897   7,320
Related allowance 801   805
Average recorded investment 17,598 $ 21,399  
Interest income recognized 100 130  
Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 8,175   5,940
Recorded investment with no allowance 3,137   1,813
Recorded investment with an allowance 3,872   3,158
Related allowance 501   492
Average recorded investment 5,679 8,547  
Impaired Accruing Restructured Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 9,726   13,326
Recorded investment with no allowance 5,701   9,164
Recorded investment with an allowance 4,025   4,162
Related allowance 300   313
Average recorded investment 11,919 12,852  
Interest income recognized 100 130  
Residential Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 6,292   6,156
Recorded investment with no allowance 2,901   3,524
Recorded investment with an allowance 3,068   2,494
Related allowance 237   239
Average recorded investment 5,917 7,772  
Interest income recognized 46 43  
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 2,122   1,620
Recorded investment with no allowance 1,096   1,482
Recorded investment with an allowance 703    
Related allowance 14    
Average recorded investment 1,625 4,010  
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 4,170   4,536
Recorded investment with no allowance 1,805   2,042
Recorded investment with an allowance 2,365   2,494
Related allowance 223   239
Average recorded investment 4,292 3,762  
Interest income recognized 46 43  
Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 7,072   5,613
Recorded investment with no allowance 5,699   4,233
Recorded investment with an allowance 727   734
Related allowance 36   33
Average recorded investment 5,370 5,629  
Interest income recognized 41 57  
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 2,506   795
Recorded investment with no allowance 1,860   149
Average recorded investment 720 721  
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 4,566   4,818
Recorded investment with no allowance 3,839   4,084
Recorded investment with an allowance 727   734
Related allowance 36   33
Average recorded investment 4,650 4,908  
Interest income recognized 41 57  
Commercial Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 455   425
Recorded investment with an allowance 363   337
Related allowance 59   33
Average recorded investment 345    
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 455   425
Recorded investment with an allowance 363   337
Related allowance 59   33
Average recorded investment 345    
Consumer Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Average recorded investment   99  
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Average recorded investment   99  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 4,082   7,072
Recorded investment with no allowance 238   3,220
Recorded investment with an allowance 3,739   3,755
Related allowance 469   500
Average recorded investment 5,966 7,899  
Interest income recognized 13 30  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 3,092   3,100
Recorded investment with no allowance 181   182
Recorded investment with an allowance 2,806   2,821
Related allowance 428   459
Average recorded investment 2,989 3,717  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 990   3,972
Recorded investment with no allowance 57   3,038
Recorded investment with an allowance 933   934
Related allowance 41   $ 41
Average recorded investment 2,977 4,182  
Interest income recognized $ 13 $ 30