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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | $ 17,476 |  | $ 19,266
Recorded investment with no allowance | 7,012 |  | 10,977
Recorded investment with an allowance | 9,365 |  | 7,320
Related allowance | 711 |  | 805
Average recorded investment | 16,428 | $ 20,192 |
Interest income recognized | 16,916 | 20,794 |
Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 7,856 |  | 5,940
Recorded investment with no allowance | 3,643 |  | 1,813
Recorded investment with an allowance | 3,114 |  | 3,158
Related allowance | 421 |  | 492
Average recorded investment | 6,757 | 7,874 |
Interest income recognized | 6,121 | 8,210 |
Impaired Accruing Restructured Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 9,620 |  | 13,326
Recorded investment with no allowance | 3,369 |  | 9,164
Recorded investment with an allowance | 6,251 |  | 4,162
Related allowance | 290 |  | 313
Average recorded investment | 9,671 | 12,318 |
Interest income recognized | 10,795 | 12,584 |
Residential Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 5,941 |  | 6,156
Recorded investment with no allowance | 3,299 |  | 3,524
Recorded investment with an allowance | 2,393 |  | 2,494
Related allowance | 201 |  | 239
Average recorded investment | 6,429 | 7,279 |
Interest income recognized | 6,069 | 7,525 |
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 1,838 |  | 1,620
Recorded investment with no allowance | 1,589 |  | 1,482
Average recorded investment | 1,590 | 3,870 |
Interest income recognized | 1,504 | 3,940 |
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 4,103 |  | 4,536
Recorded investment with no allowance | 1,710 |  | 2,042
Recorded investment with an allowance | 2,393 |  | 2,494
Related allowance | 201 |  | 239
Average recorded investment | 4,839 | 3,409 |
Interest income recognized | 4,565 | 3,585 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 7,030 |  | 5,613
Recorded investment with no allowance | 3,457 |  | 4,233
Recorded investment with an allowance | 2,926 |  | 734
Related allowance | 38 |  | 33
Average recorded investment | 6,394 | 5,539 |
Interest income recognized | 5,882 | 5,584 |
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 2,500 |  | 795
Recorded investment with no allowance | 1,853 |  | 149
Average recorded investment | 1,853 | 670 |
Interest income recognized | 1,286 | 696 |
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 4,530 |  | 4,818
Recorded investment with no allowance | 1,604 |  | 4,084
Recorded investment with an allowance | 2,926 |  | 734
Related allowance | 38 |  | 33
Average recorded investment | 4,541 | 4,869 |
Interest income recognized | 4,596 | 4,888 |
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 425 |  | 425
Recorded investment with an allowance | 333 |  | 337
Related allowance | 29 |  | 33
Average recorded investment | 332 | 115 |
Interest income recognized | 344 | 57 |
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 425 |  | 425
Recorded investment with an allowance | 333 |  | 337
Related allowance | 29 |  | 33
Average recorded investment | 332 | 115 |
Interest income recognized | 344 | 57 |
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Average recorded investment |  | 66 |
Interest income recognized |  | 82 |
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Average recorded investment |  | 66 |
Interest income recognized |  | 82 |
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Unpaid principal balance | 4,080 |  | 7,072
Recorded investment with no allowance | 256 |  | 3,220
Recorded investment with an allowance | 3,713 |  | 3,755
Related allowance | 443 |  | 500
Average recorded investment | 3,273 | 7,193 |
Interest income recognized | 4,621 | 7,546 |
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 | 3,093 |  | 3,100
Recorded investment with no allowance | 201 |  | 182
Recorded investment with an allowance | 2,781 |  | 2,821
Related allowance | 392 |  | 459
Average recorded investment | 2,982 | 3,153 |
Interest income recognized | 2,987 | 3,435 |
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 | 987 |  | 3,972
Recorded investment with no allowance | 55 |  | 3,038
Recorded investment with an allowance | 932 |  | 934
Related allowance | 51 |  | $ 41
Average recorded investment | 291 | 4,040 |
Interest income recognized | $ 1,634 | $ 4,111 |

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