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Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (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
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | $ 11,935 |  | $ 11,935 |  | $ 16,464
With a specific allowance recorded | 9,542 |  | 9,542 |  | 8,759
Total recorded investment in impaired loans | 21,477 |  | 21,477 |  | 25,223
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 13,923 |  | 13,923 |  | 22,677
With a specific allowance recorded | 9,719 |  | 9,719 |  | 9,028
Total unpaid principal balance of impaired loans | 23,642 |  | 23,642 |  | 31,705
Specific valuation | 1,188 |  | 1,188 |  | 1,138
Average recorded investment in impaired loans during the period | 22,390 | $ 26,186 | 23,921 | $ 25,884 | 25,909
Interest income recognized on impaired loans during the period ended | 217 | 210 | 602 | 743 | 948
Charged-off portion of impaired loans | 2,700 |  | 2,700 |  |
Outstanding commitments to extend credit on impaired loans | 857 |  | 857 |  | 1,400
Commercial loans | Commercial and industrial |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,108 |  | 2,108 |  | 1,141
With a specific allowance recorded | 2,343 |  | 2,343 |  | 2,443
Total recorded investment in impaired loans | 4,451 |  | 4,451 |  | 3,584
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,105 |  | 2,105 |  | 1,186
With a specific allowance recorded | 2,398 |  | 2,398 |  | 2,524
Total unpaid principal balance of impaired loans | 4,503 |  | 4,503 |  | 3,710
Specific valuation | 935 |  | 935 |  | 694
Average recorded investment in impaired loans during the period | 4,473 | 5,292 | 4,121 | 5,818 | 5,354
Interest income recognized on impaired loans during the period ended | 58 | 88 | 176 | 309 | 378
Commercial real estate loans | Commercial real estate, owner-occupied |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,882 |  | 2,882 |  | 5,577
With a specific allowance recorded | 4,111 |  | 4,111 |  | 2,882
Total recorded investment in impaired loans | 6,993 |  | 6,993 |  | 8,459
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,882 |  | 2,882 |  | 6,577
With a specific allowance recorded | 4,111 |  | 4,111 |  | 2,882
Total unpaid principal balance of impaired loans | 6,993 |  | 6,993 |  | 9,459
Specific valuation | 55 |  | 55 |  | 65
Average recorded investment in impaired loans during the period | 7,695 | 6,982 | 8,183 | 5,980 | 6,604
Interest income recognized on impaired loans during the period ended | 84 | 54 | 228 | 220 | 288
Commercial real estate loans | Commercial real estate, investor |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,537 |  | 2,537 |  | 2,954
With a specific allowance recorded | 217 |  | 217 |  | 0
Total recorded investment in impaired loans | 2,754 |  | 2,754 |  | 2,954
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 4,528 |  | 4,528 |  | 4,945
With a specific allowance recorded | 217 |  | 217 |  | 0
Total unpaid principal balance of impaired loans | 4,745 |  | 4,745 |  | 4,945
Specific valuation | 0 |  | 0 |  | 0
Average recorded investment in impaired loans during the period | 2,886 | 3,090 | 2,916 | 3,186 | 3,138
Interest income recognized on impaired loans during the period ended | 10 | 7 | 24 | 21 | 28
Commercial real estate loans | Construction |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,688 |  | 2,688 |  | 5,134
With a specific allowance recorded | 552 |  | 552 |  | 561
Total recorded investment in impaired loans | 3,240 |  | 3,240 |  | 5,695
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,688 |  | 2,688 |  | 7,824
With a specific allowance recorded | 674 |  | 674 |  | 749
Total unpaid principal balance of impaired loans | 3,362 |  | 3,362 |  | 8,573
Specific valuation | 3 |  | 3 |  | 3
Average recorded investment in impaired loans during the period | 3,262 | 6,678 | 4,473 | 6,568 | 6,471
Interest income recognized on impaired loans during the period ended | 22 | 23 | 40 | 67 | 85
Residential loans | Home equity |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 171 |  | 171 |  | 393
With a specific allowance recorded | 391 |  | 391 |  | 300
Total recorded investment in impaired loans | 562 |  | 562 |  | 693
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 171 |  | 171 |  | 880
With a specific allowance recorded | 391 |  | 391 |  | 300
Total unpaid principal balance of impaired loans | 562 |  | 562 |  | 1,180
Specific valuation | 3 |  | 3 |  | 0
Average recorded investment in impaired loans during the period | 610 | 857 | 616 | 730 | 741
Interest income recognized on impaired loans during the period ended | 5 | 5 | 14 | 14 | 19
Residential loans | Other residential |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,220 |  | 1,220 |  | 1,026
With a specific allowance recorded | 800 |  | 800 |  | 1,019
Total recorded investment in impaired loans | 2,020 |  | 2,020 |  | 2,045
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,220 |  | 1,220 |  | 1,026
With a specific allowance recorded | 800 |  | 800 |  | 1,019
Total unpaid principal balance of impaired loans | 2,020 |  | 2,020 |  | 2,045
Specific valuation | 71 |  | 71 |  | 92
Average recorded investment in impaired loans during the period | 2,025 | 1,440 | 2,033 | 1,726 | 1,744
Interest income recognized on impaired loans during the period ended | 23 | 14 | 69 | 56 | 74
Consumer loans | Installment and other consumer |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 329 |  | 329 |  | 239
With a specific allowance recorded | 1,128 |  | 1,128 |  | 1,554
Total recorded investment in impaired loans | 1,457 |  | 1,457 |  | 1,793
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 329 |  | 329 |  | 239
With a specific allowance recorded | 1,128 |  | 1,128 |  | 1,554
Total unpaid principal balance of impaired loans | 1,457 |  | 1,457 |  | 1,793
Specific valuation | 121 |  | 121 |  | 284
Average recorded investment in impaired loans during the period | 1,439 | 1,847 | 1,579 | 1,876 | 1,857
Interest income recognized on impaired loans during the period ended | $ 15 | $ 19 | $ 51 | $ 56 | $ 76

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