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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

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