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Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | $ 30,786 | $ 36,996 | $ 30,786 | $ 36,996 | $ 35,862
Unpaid Principal Balance | 33,276 | 39,211 | 33,276 | 39,211 | 39,026
Related Allowance | 826 | 2,843 | 826 | 2,843 | 1,803
Average Recorded Investment | 31,358 | 37,064 | 33,502 | 39,105 | 38,404
Recognized Interest Income | 311 | 435 | 948 | 1,138 | 1,465
With No Related Allowance |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 21,216 | 26,475 | 21,216 | 26,475 | 26,313
Unpaid Principal Balance | 23,313 | 28,201 | 23,313 | 28,201 | 29,077
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 21,420 | 25,158 | 23,408 | 26,994 | 26,926
Recognized Interest Income | 215 | 305 | 630 | 796 | 1,078
With an Allowance Recorded |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 9,570 | 10,521 | 9,570 | 10,521 | 9,549
Unpaid Principal Balance | 9,963 | 11,010 | 9,963 | 11,010 | 9,949
Related Allowance | 826 | 2,843 | 826 | 2,843 | 1,803
Average Recorded Investment | 9,938 | 11,906 | 10,094 | 12,111 | 11,478
Recognized Interest Income | 96 | 130 | 318 | 342 | 387
Commercial real estate |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 11,228 | 14,418 | 11,228 | 14,418 | 13,304
Unpaid Principal Balance | 11,776 | 15,135 | 11,776 | 15,135 | 14,212
Related Allowance | 71 | 1,041 | 71 | 1,041 | 346
Average Recorded Investment | 11,604 | 14,537 | 12,379 | 14,217 | 14,120
Recognized Interest Income | 102 | 147 | 355 | 429 | 550
Commercial real estate | With No Related Allowance |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 7,976 | 12,509 | 7,976 | 12,509 | 11,687
Unpaid Principal Balance | 8,444 | 13,064 | 8,444 | 13,064 | 12,423
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 8,310 | 11,183 | 9,410 | 10,700 | 11,080
Recognized Interest Income | 65 | 123 | 247 | 362 | 488
Commercial real estate | With an Allowance Recorded |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 3,252 | 1,909 | 3,252 | 1,909 | 1,617
Unpaid Principal Balance | 3,332 | 2,071 | 3,332 | 2,071 | 1,789
Related Allowance | 71 | 1,041 | 71 | 1,041 | 346
Average Recorded Investment | 3,294 | 3,354 | 2,969 | 3,517 | 3,040
Recognized Interest Income | 37 | 24 | 108 | 67 | 62
Commercial construction |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 996 | 1,380 | 996 | 1,380 | 1,380
Unpaid Principal Balance | 996 | 1,380 | 996 | 1,380 | 1,380
Related Allowance | 282 | 411 | 282 | 411 | 413
Average Recorded Investment | 996 | 1,455 | 1,206 | 1,285 | 1,309
Recognized Interest Income | 13 | 14 | 38 | 42 | 56
Commercial construction | With No Related Allowance |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 40 | 30
Recognized Interest Income | 0 | 0 | 0 | 0 | 0
Commercial construction | With an Allowance Recorded |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 996 | 1,380 | 996 | 1,380 | 1,380
Unpaid Principal Balance | 996 | 1,380 | 996 | 1,380 | 1,380
Related Allowance | 282 | 411 | 282 | 411 | 413
Average Recorded Investment | 996 | 1,455 | 1,206 | 1,245 | 1,279
Recognized Interest Income | 13 | 14 | 38 | 42 | 56
Commercial other |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 1,736 | 3,892 | 1,736 | 3,892 | 2,942
Unpaid Principal Balance | 1,811 | 4,208 | 1,811 | 4,208 | 3,745
Related Allowance | 8 | 660 | 8 | 660 | 129
Average Recorded Investment | 1,850 | 4,099 | 2,394 | 5,473 | 4,956
Recognized Interest Income | 34 | 95 | 80 | 163 | 169
Commercial other | With No Related Allowance |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 1,660 | 3,029 | 1,660 | 3,029 | 2,616
Unpaid Principal Balance | 1,728 | 3,255 | 1,728 | 3,255 | 3,407
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 1,698 | 3,071 | 2,077 | 4,221 | 3,853
Recognized Interest Income | 34 | 66 | 76 | 125 | 156
Commercial other | With an Allowance Recorded |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 76 | 863 | 76 | 863 | 326
Unpaid Principal Balance | 83 | 953 | 83 | 953 | 338
Related Allowance | 8 | 660 | 8 | 660 | 129
Average Recorded Investment | 152 | 1,028 | 317 | 1,252 | 1,103
Recognized Interest Income | 0 | 29 | 4 | 38 | 13
Residential term |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 15,276 | 15,896 | 15,276 | 15,896 | 16,123
Unpaid Principal Balance | 16,491 | 16,839 | 16,491 | 16,839 | 17,337
Related Allowance | 435 | 661 | 435 | 661 | 519
Average Recorded Investment | 15,281 | 15,539 | 15,857 | 16,309 | 16,243
Recognized Interest Income | 141 | 169 | 434 | 479 | 641
Residential term | With No Related Allowance |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 10,096 | 9,777 | 10,096 | 9,777 | 10,820
Unpaid Principal Balance | 11,006 | 10,488 | 11,006 | 10,488 | 11,824
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 9,852 | 9,746 | 10,482 | 10,478 | 10,505
Recognized Interest Income | 95 | 107 | 268 | 286 | 402
Residential term | With an Allowance Recorded |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 5,180 | 6,119 | 5,180 | 6,119 | 5,303
Unpaid Principal Balance | 5,485 | 6,351 | 5,485 | 6,351 | 5,513
Related Allowance | 435 | 661 | 435 | 661 | 519
Average Recorded Investment | 5,429 | 5,793 | 5,375 | 5,831 | 5,738
Recognized Interest Income | 46 | 62 | 166 | 193 | 239
Residential construction |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0 | 0 | 0
Residential construction | With No Related Allowance |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0 | 0 | 0
Residential construction | With an Allowance Recorded |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | 0 | 0 | 0 | 0 | 0
Home equity line of credit |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 1,550 | 1,384 | 1,550 | 1,384 | 2,087
Unpaid Principal Balance | 2,202 | 1,621 | 2,202 | 1,621 | 2,324
Related Allowance | 30 | 70 | 30 | 70 | 396
Average Recorded Investment | 1,565 | 1,416 | 1,610 | 1,815 | 1,765
Recognized Interest Income | 21 | 8 | 38 | 23 | 46
Home equity line of credit | With No Related Allowance |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 1,484 | 1,134 | 1,484 | 1,134 | 1,164
Unpaid Principal Balance | 2,135 | 1,366 | 2,135 | 1,366 | 1,395
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 1,498 | 1,140 | 1,383 | 1,549 | 1,447
Recognized Interest Income | 21 | 7 | 36 | 21 | 29
Home equity line of credit | With an Allowance Recorded |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 66 | 250 | 66 | 250 | 923
Unpaid Principal Balance | 67 | 255 | 67 | 255 | 929
Related Allowance | 30 | 70 | 30 | 70 | 396
Average Recorded Investment | 67 | 276 | 227 | 266 | 318
Recognized Interest Income | 0 | 1 | 2 | 2 | 17
Consumer |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 0 | 26 | 0 | 26 | 26
Unpaid Principal Balance | 0 | 28 | 0 | 28 | 28
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 62 | 18 | 56 | 6 | 11
Recognized Interest Income | 0 | 2 | 3 | 2 | 3
Consumer | With No Related Allowance |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 0 | 26 | 0 | 26 | 26
Unpaid Principal Balance | 0 | 28 | 0 | 28 | 28
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 62 | 18 | 56 | 6 | 11
Recognized Interest Income | 0 | 2 | 3 | 2 | 3
Consumer | With an Allowance Recorded |  |  |  |  |
Schedule of Financing Receivables [Line Items] |  |  |  |  |
Recorded Investment | 0 | 0 | 0 | 0 | 0
Unpaid Principal Balance | 0 | 0 | 0 | 0 | 0
Related Allowance | 0 | 0 | 0 | 0 | 0
Average Recorded Investment | 0 | 0 | 0 | 0 | 0
Recognized Interest Income | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

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