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Impaired Loan Information by Portfolio (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 1,342 | $ 5,214 | $ 1,930
Related Allowance | 1,342 | 5,214 | 1,930
Recorded Investment | 72,801 | 77,297 | 51,410
Unpaid Principal Balance | 79,276 | 81,071 | 54,822
Average Recorded Investment | 76,180 | 77,209 | 51,678
Interest Income Recognized | 2,026 | 2,700 | 1,993
Commercial and Industrial [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 10 | 3,661 | 183
Commercial Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 42 | 196 | 204
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 | 8 | 4
Residential Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1,007 | 1,086 | 1,278
Home Equity [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 265 | 242 | 238
Consumer Portfolio Segment [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 17 | 21 | 23
With No Related Allowance Recorded [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 57,373 | 49,745 | 24,403
Unpaid Principal Balance | 62,867 | 52,377 | 26,276
Average Recorded Investment | 60,380 | 48,814 | 24,774
Interest Income Recognized | 1,449 | 1,764 | 835
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Commercial and Industrial [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 34,267 | 28,776 | 2,613
Unpaid Principal Balance | 38,329 | 29,772 | 3,002
Average Recorded Investment | 36,631 | 26,472 | 3,024
Interest Income Recognized | 446 | 927 | 71
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Commercial Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 13,245 | 11,628 | 12,008
Unpaid Principal Balance | 14,374 | 12,891 | 13,128
Average Recorded Investment | 13,683 | 12,744 | 11,676
Interest Income Recognized | 559 | 437 | 375
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Construction Loans [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment |  |  | 304
Unpaid Principal Balance |  |  | 305
Average Recorded Investment |  |  | 308
Related Allowance |  |  | 0
With No Related Allowance Recorded [Member] | Small Business [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 556 | 494 | 527
Unpaid Principal Balance | 619 | 569 | 618
Average Recorded Investment | 569 | 534 | 584
Interest Income Recognized | 21 | 20 | 22
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Residential Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 4,264 | 4,216 | 3,874
Unpaid Principal Balance | 4,397 | 4,427 | 4,033
Average Recorded Investment | 4,332 | 4,302 | 3,958
Interest Income Recognized | 218 | 185 | 157
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Home Equity [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 4,950 | 4,485 | 4,893
Unpaid Principal Balance | 5,056 | 4,572 | 5,005
Average Recorded Investment | 5,063 | 4,602 | 5,023
Interest Income Recognized | 198 | 184 | 195
Related Allowance | 0 | 0 | 0
With No Related Allowance Recorded [Member] | Consumer Portfolio Segment [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 91 | 146 | 184
Unpaid Principal Balance | 92 | 146 | 185
Average Recorded Investment | 102 | 160 | 201
Interest Income Recognized | 7 | 11 | 15
Related Allowance | 0 | 0 | 0
With Allowance Recorded [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 15,428 | 27,552 | 27,007
Unpaid Principal Balance | 16,409 | 28,694 | 28,546
Average Recorded Investment | 15,800 | 28,395 | 26,904
Interest Income Recognized | 577 | 936 | 1,158
With Allowance Recorded [Member] | Commercial and Industrial [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 376 | 10,402 | 2,534
Unpaid Principal Balance | 376 | 10,440 | 2,648
Average Recorded Investment | 391 | 10,760 | 2,848
Interest Income Recognized | 19 | 325 | 48
With Allowance Recorded [Member] | Commercial Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 3,393 | 5,185 | 10,978
Unpaid Principal Balance | 3,399 | 5,533 | 11,047
Average Recorded Investment | 3,447 | 5,491 | 10,789
Interest Income Recognized | 198 | 200 | 592
With Allowance Recorded [Member] | Small Business [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 147 | 377 | 494
Unpaid Principal Balance | 153 | 392 | 523
Average Recorded Investment | 238 | 408 | 535
Interest Income Recognized | 14 | 21 | 30
With Allowance Recorded [Member] | Residential Real Estate [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 9,420 | 9,959 | 11,531
Unpaid Principal Balance | 10,154 | 10,530 | 12,652
Average Recorded Investment | 9,575 | 10,065 | 11,669
Interest Income Recognized | 284 | 332 | 460
With Allowance Recorded [Member] | Home Equity [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 1,876 | 1,378 | 1,096
Unpaid Principal Balance | 2,110 | 1,547 | 1,287
Average Recorded Investment | 1,916 | 1,403 | 655
Interest Income Recognized | 55 | 50 | 14
With Allowance Recorded [Member] | Consumer Portfolio Segment [Member] |  |  |
Impaired loans by loan portfolio |  |  |
Recorded Investment | 216 | 251 | 374
Unpaid Principal Balance | 217 | 252 | 389
Average Recorded Investment | 233 | 268 | 408
Interest Income Recognized | $ 7 | $ 8 | $ 14

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