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Impaired Loan Information by Portfolio (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 1,079 | $ 1,342 | $ 5,214
Related Allowance | 1,079 | 1,342 | 5,214
Recorded Investment | 59,060 | 72,801 | 77,297
Unpaid Principal Balance | 68,514 | 79,276 | 81,071
Average Recorded Investment | 63,522 | 76,180 | 77,209
Interest Income Recognized | 1,554 | 2,026 | 2,700
Commercial and Industrial [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 7 | 10 | 3,661
Commercial Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 37 | 42 | 196
Construction Loans [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0 | 0
Small Business [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1 | 1 | 8
Residential Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 862 | 1,007 | 1,086
Home Equity [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 164 | 265 | 242
Consumer Portfolio Segment [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 8 | 17 | 21
With No Related Allowance Recorded [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 47,900 | 57,373 | 49,745
Unpaid Principal Balance | 56,125 | 62,867 | 52,377
Average Recorded Investment | 51,970 | 60,380 | 48,814
Interest Income Recognized | 1,111 | 1,449 | 1,764
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Commercial and Industrial [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 28,459 | 34,267 | 28,776
Unpaid Principal Balance | 35,913 | 38,329 | 29,772
Average Recorded Investment | 31,117 | 36,631 | 26,472
Interest Income Recognized | 142 | 446 | 927
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Commercial Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 9,552 | 13,245 | 11,628
Unpaid Principal Balance | 9,832 | 14,374 | 12,891
Average Recorded Investment | 10,561 | 13,683 | 12,744
Interest Income Recognized | 519 | 559 | 437
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Construction Loans [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Related Allowance |  |  | 0
With No Related Allowance Recorded [Member] | Small Business [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 358 | 556 | 494
Unpaid Principal Balance | 439 | 619 | 569
Average Recorded Investment | 401 | 569 | 534
Interest Income Recognized | 14 | 21 | 20
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Residential Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 4,518 | 4,264 | 4,216
Unpaid Principal Balance | 4,686 | 4,397 | 4,427
Average Recorded Investment | 4,597 | 4,332 | 4,302
Interest Income Recognized | 212 | 218 | 185
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Home Equity [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 4,957 | 4,950 | 4,485
Unpaid Principal Balance | 5,199 | 5,056 | 4,572
Average Recorded Investment | 5,230 | 5,063 | 4,602
Interest Income Recognized | 220 | 198 | 184
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Consumer Portfolio Segment [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 56 | 91 | 146
Unpaid Principal Balance | 56 | 92 | 146
Average Recorded Investment | 64 | 102 | 160
Interest Income Recognized | 4 | 7 | 11
Related Allowance | 0 | 0 | 0
With Allowance Recorded [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 11,160 | 15,428 | 27,552
Unpaid Principal Balance | 12,389 | 16,409 | 28,694
Average Recorded Investment | 11,552 | 15,800 | 28,395
Interest Income Recognized | 443 | 577 | 936
With Allowance Recorded [Member] | Commercial and Industrial [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 370 | 376 | 10,402
Unpaid Principal Balance | 370 | 376 | 10,440
Average Recorded Investment | 385 | 391 | 10,760
Interest Income Recognized | 19 | 19 | 325
With Allowance Recorded [Member] | Commercial Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 1,287 | 3,393 | 5,185
Unpaid Principal Balance | 1,287 | 3,399 | 5,533
Average Recorded Investment | 1,311 | 3,447 | 5,491
Interest Income Recognized | 74 | 198 | 200
With Allowance Recorded [Member] | Small Business [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 183 | 147 | 377
Unpaid Principal Balance | 223 | 153 | 392
Average Recorded Investment | 225 | 238 | 408
Interest Income Recognized | 13 | 14 | 21
With Allowance Recorded [Member] | Residential Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 8,188 | 9,420 | 9,959
Unpaid Principal Balance | 9,217 | 10,154 | 10,530
Average Recorded Investment | 8,459 | 9,575 | 10,065
Interest Income Recognized | 289 | 284 | 332
With Allowance Recorded [Member] | Home Equity [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 991 | 1,876 | 1,378
Unpaid Principal Balance | 1,149 | 2,110 | 1,547
Average Recorded Investment | 1,018 | 1,916 | 1,403
Interest Income Recognized | 43 | 55 | 50
With Allowance Recorded [Member] | Consumer Portfolio Segment [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 141 | 216 | 251
Unpaid Principal Balance | 143 | 217 | 252
Average Recorded Investment | 154 | 233 | 268
Interest Income Recognized | $ 5 | $ 7 | $ 8

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