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Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | $ 5,347,000 |  | $ 5,347,000 |  | $ 12,928,000
With a specific allowance recorded | 14,310,000 |  | 14,310,000 |  | 8,260,000
Total recorded investment in impaired loans | 19,657,000 |  | 19,657,000 |  | 21,188,000
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 19,657,000 |  | 19,657,000 |  | 23,409,000
Specific valuation | 1,343,000 |  | 1,343,000 |  | 1,169,000
Average recorded investment in impaired loans during the period | 21,139,000 | $ 22,390,000 | 21,788,000 | $ 23,921,000 |
Interest income recognized on impaired loans during the period ended | 1,600,000 | 217,000 | 2,021,000 | 602,000 |
Interest income recognized on impaired loans during the period ended, cash basis | 1,400,000 | 0 | 1,400,000 | 0 |
Charged-off portion of impaired loans |  |  |  |  | 2,100,000
Outstanding commitments to extend credit on impaired loans | 1,300,000 |  | 1,300,000 |  |
Commercial loans | Commercial and industrial |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,102,000 |  | 1,102,000 |  | 2,198,000
With a specific allowance recorded | 1,906,000 |  | 1,906,000 |  | 2,522,000
Total recorded investment in impaired loans | 3,008,000 |  | 3,008,000 |  | 4,720,000
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 3,008,000 |  | 3,008,000 |  | 4,763,000
Specific valuation | 569,000 |  | 569,000 |  | 912,000
Average recorded investment in impaired loans during the period | 3,352,000 | 4,473,000 | 3,802,000 | 4,121,000 |
Interest income recognized on impaired loans during the period ended | 44,000 | 58,000 | 142,000 | 176,000 |
Commercial real estate loans | Commercial real estate, owner-occupied |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 0 |  | 0 |  | 4,111,000
With a specific allowance recorded | 7,169,000 |  | 7,169,000 |  | 2,882,000
Total recorded investment in impaired loans | 7,169,000 |  | 7,169,000 |  | 6,993,000
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 7,169,000 |  | 7,169,000 |  | 6,993,000
Specific valuation | 108,000 |  | 108,000 |  | 70,000
Average recorded investment in impaired loans during the period | 7,169,000 | 7,695,000 | 7,081,000 | 8,183,000 |
Interest income recognized on impaired loans during the period ended | 67,000 | 84,000 | 133,000 | 228,000 |
Commercial real estate loans | Commercial real estate, investor |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 0 |  | 0 |  | 2,416,000
With a specific allowance recorded | 2,299,000 |  | 2,299,000 |  | 0
Total recorded investment in impaired loans | 2,299,000 |  | 2,299,000 |  | 2,416,000
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 2,299,000 |  | 2,299,000 |  | 4,408,000
Specific valuation | 474,000 |  | 474,000 |  | 0
Average recorded investment in impaired loans during the period | 3,146,000 | 2,886,000 | 3,397,000 | 2,916,000 |
Interest income recognized on impaired loans during the period ended | 1,385,000 | 10,000 | 1,489,000 | 24,000 |
Commercial real estate loans | Construction |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 2,688,000 |  | 2,688,000 |  | 2,687,000
With a specific allowance recorded | 550,000 |  | 550,000 |  | 551,000
Total recorded investment in impaired loans | 3,238,000 |  | 3,238,000 |  | 3,238,000
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 3,238,000 |  | 3,238,000 |  | 3,424,000
Specific valuation | 5,000 |  | 5,000 |  | 1,000
Average recorded investment in impaired loans during the period | 3,238,000 | 3,262,000 | 3,238,000 | 4,473,000 |
Interest income recognized on impaired loans during the period ended | 32,000 | 22,000 | 105,000 | 40,000 |
Residential loans | Home equity |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 260,000 |  | 260,000 |  | 171,000
With a specific allowance recorded | 625,000 |  | 625,000 |  | 388,000
Total recorded investment in impaired loans | 885,000 |  | 885,000 |  | 559,000
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 885,000 |  | 885,000 |  | 559,000
Specific valuation | 34,000 |  | 34,000 |  | 3,000
Average recorded investment in impaired loans during the period | 1,140,000 | 610,000 | 1,098,000 | 616,000 |
Interest income recognized on impaired loans during the period ended | 38,000 | 5,000 | 48,000 | 14,000 |
Residential loans | Other residential |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 1,189,000 |  | 1,189,000 |  | 1,214,000
With a specific allowance recorded | 785,000 |  | 785,000 |  | 797,000
Total recorded investment in impaired loans | 1,974,000 |  | 1,974,000 |  | 2,011,000
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 1,974,000 |  | 1,974,000 |  | 2,011,000
Specific valuation | 59,000 |  | 59,000 |  | 67,000
Average recorded investment in impaired loans during the period | 1,981,000 | 2,025,000 | 1,993,000 | 2,033,000 |
Interest income recognized on impaired loans during the period ended | 22,000 | 23,000 | 67,000 | 69,000 |
Consumer loans | Installment and other consumer |  |  |  |  |
Recorded investment in impaired loans: |  |  |  |  |
With no specific allowance recorded | 108,000 |  | 108,000 |  | 131,000
With a specific allowance recorded | 976,000 |  | 976,000 |  | 1,120,000
Total recorded investment in impaired loans | 1,084,000 |  | 1,084,000 |  | 1,251,000
Unpaid principal balance of impaired loans: |  |  |  |  |
Total unpaid principal balance of impaired loans | 1,084,000 |  | 1,084,000 |  | 1,251,000
Specific valuation | 94,000 |  | 94,000 |  | $ 116,000
Average recorded investment in impaired loans during the period | 1,113,000 | 1,439,000 | 1,179,000 | 1,579,000 |
Interest income recognized on impaired loans during the period ended | $ 12,000 | $ 15,000 | $ 37,000 | $ 51,000 |

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