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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | $ 28,610 | $ 34,833 | $ 29,531
Unpaid Principal Balance | 31,078 | 38,244 | 31,906
Related Allowance | 599 | 1,436 | 754
Average Recorded Investment | 28,973 | 35,121 | 32,698
Recognized Interest Income | 275 | 311 | 1,220
With No Related Allowance |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 20,544 | 23,990 | 20,889
Unpaid Principal Balance | 22,651 | 26,136 | 22,947
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 20,490 | 25,806 | 22,808
Recognized Interest Income | 187 | 213 | 839
With an Allowance Recorded |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 8,066 | 10,843 | 8,642
Unpaid Principal Balance | 8,427 | 12,108 | 8,959
Related Allowance | 599 | 1,436 | 754
Average Recorded Investment | 8,483 | 9,315 | 9,890
Recognized Interest Income | 88 | 98 | 381
Commercial real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 10,510 | 12,705 | 10,717
Unpaid Principal Balance | 10,925 | 13,451 | 11,123
Related Allowance | 69 | 248 | 89
Average Recorded Investment | 10,620 | 12,895 | 12,056
Recognized Interest Income | 115 | 120 | 450
Commercial real estate | With No Related Allowance |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 7,381 | 9,062 | 7,173
Unpaid Principal Balance | 7,712 | 9,496 | 7,496
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 7,221 | 10,899 | 8,990
Recognized Interest Income | 79 | 88 | 301
Commercial real estate | With an Allowance Recorded |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 3,129 | 3,643 | 3,544
Unpaid Principal Balance | 3,213 | 3,955 | 3,627
Related Allowance | 69 | 248 | 89
Average Recorded Investment | 3,399 | 1,996 | 3,066
Recognized Interest Income | 36 | 32 | 149
Commercial construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 967 | 1,380 | 1,026
Unpaid Principal Balance | 1,026 | 1,380 | 1,026
Related Allowance | 96 | 396 | 302
Average Recorded Investment | 1,006 | 1,372 | 1,156
Recognized Interest Income | 9 | 13 | 45
Commercial construction | With No Related Allowance |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 179 | 0 | 30
Unpaid Principal Balance | 238 | 0 | 30
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 80 | 0 | 3
Recognized Interest Income | 1 | 0 | 1
Commercial construction | With an Allowance Recorded |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 788 | 1,380 | 996
Unpaid Principal Balance | 788 | 1,380 | 996
Related Allowance | 96 | 396 | 302
Average Recorded Investment | 926 | 1,372 | 1,153
Recognized Interest Income | 8 | 13 | 44
Commercial other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 1,185 | 2,721 | 1,234
Unpaid Principal Balance | 1,233 | 3,526 | 1,287
Related Allowance | 21 | 347 | 8
Average Recorded Investment | 1,201 | 2,792 | 2,149
Recognized Interest Income | 8 | 16 | 81
Commercial other | With No Related Allowance |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 1,097 | 2,305 | 1,163
Unpaid Principal Balance | 1,137 | 2,411 | 1,210
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 1,121 | 2,465 | 1,893
Recognized Interest Income | 8 | 16 | 76
Commercial other | With an Allowance Recorded |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 88 | 416 | 71
Unpaid Principal Balance | 96 | 1,115 | 77
Related Allowance | 21 | 347 | 8
Average Recorded Investment | 80 | 327 | 256
Recognized Interest Income | 0 | 0 | 5
Municipal |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0
Municipal | With No Related Allowance |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0
Municipal | With an Allowance Recorded |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0
Residential term |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 14,540 | 16,348 | 15,088
Unpaid Principal Balance | 15,806 | 17,606 | 16,350
Related Allowance | 384 | 421 | 326
Average Recorded Investment | 14,710 | 16,369 | 15,708
Recognized Interest Income | 134 | 153 | 595
Residential term | With No Related Allowance |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 10,543 | 11,235 | 11,122
Unpaid Principal Balance | 11,541 | 12,243 | 12,157
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 10,715 | 11,136 | 10,480
Recognized Interest Income | 91 | 100 | 415
Residential term | With an Allowance Recorded |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 3,997 | 5,113 | 3,966
Unpaid Principal Balance | 4,265 | 5,363 | 4,193
Related Allowance | 384 | 421 | 326
Average Recorded Investment | 3,995 | 5,233 | 5,228
Recognized Interest Income | 43 | 53 | 180
Residential construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0
Residential construction | With No Related Allowance |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0
Residential construction | With an Allowance Recorded |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0
Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 1,408 | 1,654 | 1,466
Unpaid Principal Balance | 2,088 | 2,253 | 2,120
Related Allowance | 29 | 24 | 29
Average Recorded Investment | 1,436 | 1,668 | 1,587
Recognized Interest Income | 9 | 8 | 46
Home equity line of credit | With No Related Allowance |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 1,344 | 1,363 | 1,401
Unpaid Principal Balance | 2,023 | 1,958 | 2,054
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 1,353 | 1,281 | 1,400
Recognized Interest Income | 8 | 8 | 43
Home equity line of credit | With an Allowance Recorded |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 64 | 291 | 65
Unpaid Principal Balance | 65 | 295 | 66
Related Allowance | 29 | 24 | 29
Average Recorded Investment | 83 | 387 | 187
Recognized Interest Income | 1 | 0 | 3
Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 25 | 0
Unpaid Principal Balance | 0 | 28 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 25 | 42
Recognized Interest Income | 0 | 1 | 3
Consumer | With No Related Allowance |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 25 | 0
Unpaid Principal Balance | 0 | 28 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 25 | 42
Recognized Interest Income | 0 | 1 | 3
Consumer | With an Allowance Recorded |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Recorded Investment | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0
Related Allowance | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0
Recognized Interest Income | $ 0 | $ 0 | $ 0

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