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Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | $ 14,730 |  | $ 14,730 |  | $ 16,464
With a specific allowance recorded | 8,569 |  | 8,569 |  | 8,759
Total recorded investment in impaired loans | 23,299 |  | 23,299 |  | 25,223
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 17,718 |  | 17,718 |  | 22,677
With a specific allowance recorded | 8,818 |  | 8,818 |  | 9,028
Total unpaid principal balance of impaired loans | 26,536 |  | 26,536 |  | 31,705
Specific valuation | 1,079 |  | 1,079 |  | 1,138
Average recorded investment in impaired loans during the period | 24,207 | $ 25,721 | 24,687 | $ 25,736 | 25,909
Interest income recognized on impaired loans during the period ended | 195 | 259 | 385 | 533 | 948
Charged-off portion of impaired loans | 2,700 |  | 2,700 |  |
Outstanding commitments to extend credit on impaired loans | 767 |  | 767 |  |
Commercial loans | Commercial and industrial |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,903 |  | 1,903 |  | 1,141
With a specific allowance recorded | 2,592 |  | 2,592 |  | 2,443
Total recorded investment in impaired loans | 4,495 |  | 4,495 |  | 3,584
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,899 |  | 1,899 |  | 1,186
With a specific allowance recorded | 2,656 |  | 2,656 |  | 2,524
Total unpaid principal balance of impaired loans | 4,555 |  | 4,555 |  | 3,710
Specific valuation | 772 |  | 772 |  | 694
Average recorded investment in impaired loans during the period | 4,173 | 6,217 | 3,946 | 6,081 | 5,354
Interest income recognized on impaired loans during the period ended | 56 | 103 | 118 | 221 | 378
Commercial real estate loans | Commercial real estate, owner-occupied |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 5,514 |  | 5,514 |  | 5,577
With a specific allowance recorded | 2,882 |  | 2,882 |  | 2,882
Total recorded investment in impaired loans | 8,396 |  | 8,396 |  | 8,459
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 6,514 |  | 6,514 |  | 6,577
With a specific allowance recorded | 2,882 |  | 2,882 |  | 2,882
Total unpaid principal balance of impaired loans | 9,396 |  | 9,396 |  | 9,459
Specific valuation | 70 |  | 70 |  | 65
Average recorded investment in impaired loans during the period | 8,412 | 5,476 | 8,427 | 5,480 | 6,604
Interest income recognized on impaired loans during the period ended | 78 | 83 | 144 | 166 | 288
Commercial real estate loans | Commercial real estate, investor |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 3,018 |  | 3,018 |  | 2,954
With a specific allowance recorded | 0 |  | 0 |  | 0
Total recorded investment in impaired loans | 3,018 |  | 3,018 |  | 2,954
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 5,010 |  | 5,010 |  | 4,945
With a specific allowance recorded | 0 |  | 0 |  | 0
Total unpaid principal balance of impaired loans | 5,010 |  | 5,010 |  | 4,945
Specific valuation | 0 |  | 0 |  | 0
Average recorded investment in impaired loans during the period | 2,947 | 3,186 | 2,931 | 3,235 | 3,138
Interest income recognized on impaired loans during the period ended | 8 | 7 | 14 | 14 | 28
Commercial real estate loans | Construction |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,727 |  | 2,727 |  | 5,134
With a specific allowance recorded | 556 |  | 556 |  | 561
Total recorded investment in impaired loans | 3,283 |  | 3,283 |  | 5,695
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,727 |  | 2,727 |  | 7,824
With a specific allowance recorded | 741 |  | 741 |  | 749
Total unpaid principal balance of impaired loans | 3,468 |  | 3,468 |  | 8,573
Specific valuation | 6 |  | 6 |  | 3
Average recorded investment in impaired loans during the period | 4,475 | 6,503 | 5,078 | 6,513 | 6,471
Interest income recognized on impaired loans during the period ended | 9 | 23 | 18 | 44 | 85
Residential loans | Home equity |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 265 |  | 265 |  | 393
With a specific allowance recorded | 393 |  | 393 |  | 300
Total recorded investment in impaired loans | 658 |  | 658 |  | 693
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 265 |  | 265 |  | 880
With a specific allowance recorded | 393 |  | 393 |  | 300
Total unpaid principal balance of impaired loans | 658 |  | 658 |  | 1,180
Specific valuation | 3 |  | 3 |  | 0
Average recorded investment in impaired loans during the period | 610 | 755 | 618 | 666 | 741
Interest income recognized on impaired loans during the period ended | 4 | 5 | 9 | 9 | 19
Residential loans | Other residential |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,022 |  | 1,022 |  | 1,026
With a specific allowance recorded | 1,007 |  | 1,007 |  | 1,019
Total recorded investment in impaired loans | 2,029 |  | 2,029 |  | 2,045
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,022 |  | 1,022 |  | 1,026
With a specific allowance recorded | 1,007 |  | 1,007 |  | 1,019
Total unpaid principal balance of impaired loans | 2,029 |  | 2,029 |  | 2,045
Specific valuation | 79 |  | 79 |  | 92
Average recorded investment in impaired loans during the period | 2,033 | 1,686 | 2,037 | 1,870 | 1,744
Interest income recognized on impaired loans during the period ended | 23 | 19 | 46 | 42 | 74
Consumer loans | Installment and other consumer |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 281 |  | 281 |  | 239
With a specific allowance recorded | 1,139 |  | 1,139 |  | 1,554
Total recorded investment in impaired loans | 1,420 |  | 1,420 |  | 1,793
Unpaid principal balance of impaired loans: |  |  |  |  |
With no specific allowance recorded | 281 |  | 281 |  | 239
With a specific allowance recorded | 1,139 |  | 1,139 |  | 1,554
Total unpaid principal balance of impaired loans | 1,420 |  | 1,420 |  | 1,793
Specific valuation | 149 |  | 149 |  | 284
Average recorded investment in impaired loans during the period | 1,557 | 1,898 | 1,650 | 1,891 | 1,857
Interest income recognized on impaired loans during the period ended | $ 17 | $ 19 | $ 36 | $ 37 | $ 76

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