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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 |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | $ 7,569 |  | $ 7,569 |  | $ 12,928
With a specific allowance recorded | 15,050 |  | 15,050 |  | 8,260
Total recorded investment in impaired loans | 22,619 |  | 22,619 |  | 21,188
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 24,628 |  | 24,628 |  | 23,409
Specific valuation | 1,421 |  | 1,421 |  | 1,169
Average recorded investment in impaired loans during the period | 22,470 | $ 24,207 | 22,111 | $ 24,687 |
Interest income recognized on impaired loans during the period ended | 205 | 195 | 420 | 385 |
Charged-off portion of impaired loans | 2,000 |  | 2,000 |  | 2,100
Outstanding commitments to extend credit on impaired loans | 944 |  | 944 |  | 1,300
Commercial loans | Commercial and industrial |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,059 |  | 1,059 |  | 2,198
With a specific allowance recorded | 2,637 |  | 2,637 |  | 2,522
Total recorded investment in impaired loans | 3,696 |  | 3,696 |  | 4,720
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 3,697 |  | 3,697 |  | 4,763
Specific valuation | 671 |  | 671 |  | 912
Average recorded investment in impaired loans during the period | 3,771 | 4,173 | 4,027 | 3,946 |
Interest income recognized on impaired loans during the period ended | 44 | 56 | 98 | 118 |
Commercial real estate loans | Commercial real estate, owner-occupied |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 0 |  | 0 |  | 4,111
With a specific allowance recorded | 7,169 |  | 7,169 |  | 2,882
Total recorded investment in impaired loans | 7,169 |  | 7,169 |  | 6,993
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 7,169 |  | 7,169 |  | 6,993
Specific valuation | 98 |  | 98 |  | 70
Average recorded investment in impaired loans during the period | 7,081 | 8,412 | 7,037 | 8,427 |
Interest income recognized on impaired loans during the period ended | 66 | 78 | 133 | 144 |
Commercial real estate loans | Commercial real estate, investor |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,676 |  | 1,676 |  | 2,416
With a specific allowance recorded | 2,317 |  | 2,317 |  | 0
Total recorded investment in impaired loans | 3,993 |  | 3,993 |  | 2,416
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 5,984 |  | 5,984 |  | 4,408
Specific valuation | 472 |  | 472 |  | 0
Average recorded investment in impaired loans during the period | 3,917 | 2,947 | 3,523 | 2,931 |
Interest income recognized on impaired loans during the period ended | 22 | 8 | 38 | 14 |
Commercial real estate loans | Construction |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,688 |  | 2,688 |  | 2,687
With a specific allowance recorded | 550 |  | 550 |  | 551
Total recorded investment in impaired loans | 3,238 |  | 3,238 |  | 3,238
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 3,238 |  | 3,238 |  | 3,424
Specific valuation | 5 |  | 5 |  | 1
Average recorded investment in impaired loans during the period | 3,238 | 4,475 | 3,238 | 5,078 |
Interest income recognized on impaired loans during the period ended | 32 | 9 | 70 | 18 |
Residential loans | Home equity |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 789 |  | 789 |  | 171
With a specific allowance recorded | 606 |  | 606 |  | 388
Total recorded investment in impaired loans | 1,395 |  | 1,395 |  | 559
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 1,411 |  | 1,411 |  | 559
Specific valuation | 12 |  | 12 |  | 3
Average recorded investment in impaired loans during the period | 1,286 | 610 | 1,077 | 618 |
Interest income recognized on impaired loans during the period ended | 6 | 4 | 11 | 9 |
Residential loans | Other residential |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,198 |  | 1,198 |  | 1,214
With a specific allowance recorded | 789 |  | 789 |  | 797
Total recorded investment in impaired loans | 1,987 |  | 1,987 |  | 2,011
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 1,987 |  | 1,987 |  | 2,011
Specific valuation | 64 |  | 64 |  | 67
Average recorded investment in impaired loans during the period | 1,993 | 2,033 | 1,998 | 2,037 |
Interest income recognized on impaired loans during the period ended | 23 | 23 | 45 | 46 |
Consumer loans | Installment and other consumer |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 159 |  | 159 |  | 131
With a specific allowance recorded | 982 |  | 982 |  | 1,120
Total recorded investment in impaired loans | 1,141 |  | 1,141 |  | 1,251
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 1,142 |  | 1,142 |  | 1,251
Specific valuation | 99 |  | 99 |  | $ 116
Average recorded investment in impaired loans during the period | 1,184 | 1,557 | 1,211 | 1,650 |
Interest income recognized on impaired loans during the period ended | $ 12 | $ 17 | $ 25 | $ 36 |

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