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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance $ 24,570 $ 26,637
Recorded investment with no allowance 15,899 14,816
Recorded investment with an allowance 7,289 10,502
Related allowance 812 761
Year-to-date average recorded investment 23,680 17,598
Interest income recognized 85 100
Impaired Nonaccrual Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 16,742 17,974
Recorded investment with no allowance 11,768 12,039
Recorded investment with an allowance 3,592 4,616
Related allowance 611 541
Year-to-date average recorded investment 15,772 5,679
Impaired Accruing Restructured Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 7,828 8,663
Recorded investment with no allowance 4,131 2,777
Recorded investment with an allowance 3,697 5,886
Related allowance 201 220
Year-to-date average recorded investment 7,908 11,919
Interest income recognized 85 100
Residential Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 7,447 8,735
Recorded investment with no allowance 3,690 4,045
Recorded investment with an allowance 3,528 4,508
Related allowance 427 301
Year-to-date average recorded investment 7,646 5,917
Interest income recognized 39 46
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 3,213 4,281
Recorded investment with no allowance 2,456 2,605
Recorded investment with an allowance 528 1,494
Related allowance 253 118
Year-to-date average recorded investment 3,338 1,625
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 4,234 4,454
Recorded investment with no allowance 1,234 1,440
Recorded investment with an allowance 3,000 3,014
Related allowance 174 183
Year-to-date average recorded investment 4,308 4,292
Interest income recognized 39 46
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 13,500 14,187
Recorded investment with no allowance 12,077 10,593
Recorded investment with an allowance 764 2,939
Related allowance 94 104
Year-to-date average recorded investment 12,868 5,370
Interest income recognized 39 41
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 9,955 10,029
Recorded investment with no allowance 9,229 9,307
Recorded investment with an allowance 67 67
Related allowance 67 67
Year-to-date average recorded investment 9,318 720
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 3,545 4,158
Recorded investment with no allowance 2,848 1,286
Recorded investment with an allowance 697 2,872
Related allowance 27 37
Year-to-date average recorded investment 3,550 4,650
Interest income recognized 39 41
Commercial Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 425 445
Recorded investment with an allowance 315 340
Related allowance 12 36
Year-to-date average recorded investment 325 345
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 425 445
Recorded investment with an allowance 315 340
Related allowance 12 36
Year-to-date average recorded investment 325 345
Construction Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 3,198 3,270
Recorded investment with no allowance 132 178
Recorded investment with an allowance 2,682 2,715
Related allowance 279 320
Year-to-date average recorded investment 2,841 5,966
Interest income recognized 7 13
Construction Loans [Member] | Impaired Nonaccrual Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 3,149 3,219
Recorded investment with no allowance 83 127
Recorded investment with an allowance 2,682 2,715
Related allowance 279 320
Year-to-date average recorded investment 2,791 2,989
Construction Loans [Member] | Impaired Accruing Restructured Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Unpaid principal balance 49 51
Recorded investment with no allowance 49 51
Year-to-date average recorded investment 50 2,977
Interest income recognized $ 7 $ 13