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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | $ 11,323 | $ 17,974
Recorded investment with no allowance | 6,656 | 12,039
Recorded investment with an allowance | 3,934 | 4,616
Related allowance | 776 | 541
Quarter-to-date average recorded investment | 10,886 | 10,364
Year-to-date average recorded investment | 13,501 | 7,357
Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 7,501 | 8,663
Recorded investment with no allowance | 5,372 | 2,777
Recorded investment with an allowance | 2,129 | 5,886
Related allowance | 199 | 220
Quarter-to-date average recorded investment | 7,531 | 8,801
Year-to-date average recorded investment | 7,699 | 9,888
Interest income recognized | 306 | 309
Other Impaired Accruing Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 1,326 |
Recorded investment with no allowance | 1,326 |
Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 20,150 | 26,637
Recorded investment with no allowance | 13,354 | 14,816
Recorded investment with an allowance | 6,063 | 10,502
Related allowance | 975 | 761
Quarter-to-date average recorded investment | 18,417 | 19,165
Year-to-date average recorded investment | 21,200 | 17,245
Interest income recognized | 306 | 309
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 2,660 | 4,281
Recorded investment with no allowance | 678 | 2,605
Recorded investment with an allowance | 1,797 | 1,494
Related allowance | 215 | 118
Quarter-to-date average recorded investment | 2,052 | 2,820
Year-to-date average recorded investment | 2,691 | 1,884
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 4,041 | 4,454
Recorded investment with no allowance | 2,583 | 1,440
Recorded investment with an allowance | 1,458 | 3,014
Related allowance | 180 | 183
Quarter-to-date average recorded investment | 4,052 | 4,585
Year-to-date average recorded investment | 4,157 | 4,606
Interest income recognized | 171 | 125
Residential Portfolio Segment [Member] | Other Impaired Accruing Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 556 |
Recorded investment with no allowance | 556 |
Residential Portfolio Segment [Member] | Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 7,257 | 8,735
Recorded investment with no allowance | 3,817 | 4,045
Recorded investment with an allowance | 3,255 | 4,508
Related allowance | 395 | 301
Quarter-to-date average recorded investment | 6,104 | 7,405
Year-to-date average recorded investment | 6,848 | 6,490
Interest income recognized | 171 | 125
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 8,242 | 10,029
Recorded investment with no allowance | 5,680 | 9,307
Recorded investment with an allowance | 2,137 | 67
Related allowance | 561 | 67
Quarter-to-date average recorded investment | 8,533 | 4,283
Year-to-date average recorded investment | 9,421 | 2,149
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 3,419 | 4,158
Recorded investment with no allowance | 2,748 | 1,286
Recorded investment with an allowance | 671 | 2,872
Related allowance | 19 | 37
Quarter-to-date average recorded investment | 3,438 | 4,164
Year-to-date average recorded investment | 3,496 | 4,416
Interest income recognized | 125 | 149
Commercial Real Estate Portfolio Segment [Member] | Other Impaired Accruing Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 770 |
Recorded investment with no allowance | 770 |
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 12,431 | 14,187
Recorded investment with no allowance | 9,198 | 10,593
Recorded investment with an allowance | 2,808 | 2,939
Related allowance | 580 | 104
Quarter-to-date average recorded investment | 11,971 | 8,447
Year-to-date average recorded investment | 12,917 | 6,565
Interest income recognized | 125 | 149
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 421 | 445
Recorded investment with no allowance | 298 |
Recorded investment with an allowance |  | 340
Related allowance |  | 36
Quarter-to-date average recorded investment | 301 | 329
Year-to-date average recorded investment | 313 | 336
Commercial Portfolio Segment [Member] | Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 421 | 445
Recorded investment with no allowance | 298 |
Recorded investment with an allowance |  | 340
Related allowance |  | 36
Quarter-to-date average recorded investment | 301 | 329
Year-to-date average recorded investment | 313 | 336
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 |  | 3,219
Recorded investment with no allowance |  | 127
Recorded investment with an allowance |  | 2,715
Related allowance |  | 320
Quarter-to-date average recorded investment |  | 2,932
Year-to-date average recorded investment | 1,076 | 2,988
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 | 41 | 51
Recorded investment with no allowance | 41 | 51
Quarter-to-date average recorded investment | 41 | 52
Year-to-date average recorded investment | 46 | 866
Interest income recognized | 10 | 35
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 41 | 3,270
Recorded investment with no allowance | 41 | 178
Recorded investment with an allowance |  | 2,715
Related allowance |  | 320
Quarter-to-date average recorded investment | 41 | 2,984
Year-to-date average recorded investment | 1,122 | 3,854
Interest income recognized | $ 10 | $ 35

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