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Loans and Allowance for Loan Losses - Impaired Loans and Related Allowance (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | $ 4,209,000 | $ 12,928,000 |
With a specific allowance recorded | 14,104,000 | 8,260,000 |
Total recorded investment in impaired loans | 18,313,000 | 21,188,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 18,270,000 | 23,409,000 |
Specific valuation | 991,000 | 1,169,000 |
Average recorded investment in impaired loans during the period | 20,835,000 | 23,273,000 | $ 25,909,000
Interest income recognized on impaired loans | 2,223,000 | 826,000 | 948,000
Charged-off portion of impaired loans | 0 | 2,100,000 |
Outstanding commitments to extend credit on impaired loans | 1,600,000 | 1,300,000 |
Interest income recognized on impaired loans during the period ended, cash basis | 1,400,000 | 0 | 0
Commercial loans | Commercial and industrial |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 315,000 | 2,198,000 |
With a specific allowance recorded | 1,892,000 | 2,522,000 |
Total recorded investment in impaired loans | 2,207,000 | 4,720,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 2,177,000 | 4,763,000 |
Specific valuation | 285,000 | 912,000 |
Average recorded investment in impaired loans during the period | 3,514,000 | 4,237,000 | 5,354,000
Interest income recognized on impaired loans | 175,000 | 238,000 | 378,000
Commercial real estate loans | Commercial real estate, owner-occupied |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 0 | 4,111,000 |
With a specific allowance recorded | 6,993,000 | 2,882,000 |
Total recorded investment in impaired loans | 6,993,000 | 6,993,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 6,993,000 | 6,993,000 |
Specific valuation | 163,000 | 70,000 |
Average recorded investment in impaired loans during the period | 7,069,000 | 7,886,000 | 6,604,000
Interest income recognized on impaired loans | 199,000 | 295,000 | 288,000
Commercial real estate loans | Commercial real estate, investor |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 0 | 2,416,000 |
With a specific allowance recorded | 2,256,000 | 0 |
Total recorded investment in impaired loans | 2,256,000 | 2,416,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 2,252,000 | 4,408,000 |
Specific valuation | 375,000 | 0 |
Average recorded investment in impaired loans during the period | 2,950,000 | 2,833,000 | 3,138,000
Interest income recognized on impaired loans | 1,514,000 | 33,000 | 28,000
Commercial real estate loans | Construction |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 2,692,000 | 2,687,000 |
With a specific allowance recorded | 553,000 | 551,000 |
Total recorded investment in impaired loans | 3,245,000 | 3,238,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 3,238,000 | 3,424,000 |
Specific valuation | 8,000 | 1,000 |
Average recorded investment in impaired loans during the period | 3,242,000 | 4,164,000 | 6,471,000
Interest income recognized on impaired loans | 137,000 | 86,000 | 85,000
Residential loans | Home equity |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 91,000 | 171,000 |
With a specific allowance recorded | 624,000 | 388,000 |
Total recorded investment in impaired loans | 715,000 | 559,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 713,000 | 559,000 |
Specific valuation | 7,000 | 3,000 |
Average recorded investment in impaired loans during the period | 945,000 | 602,000 | 741,000
Interest income recognized on impaired loans | 60,000 | 18,000 | 19,000
Residential loans | Other residential |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 1,008,000 | 1,214,000 |
With a specific allowance recorded | 957,000 | 797,000 |
Total recorded investment in impaired loans | 1,965,000 | 2,011,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 1,965,000 | 2,011,000 |
Specific valuation | 55,000 | 67,000 |
Average recorded investment in impaired loans during the period | 1,988,000 | 2,028,000 | 1,744,000
Interest income recognized on impaired loans | 90,000 | 92,000 | 74,000
Consumer loans | Installment and other consumer |  |  |
Recorded investment in impaired loans: |  |  |
With no specific allowance recorded | 103,000 | 131,000 |
With a specific allowance recorded | 829,000 | 1,120,000 |
Total recorded investment in impaired loans | 932,000 | 1,251,000 |
Unpaid principal balance of impaired loans: |  |  |
Total unpaid principal balance of impaired loans | 932,000 | 1,251,000 |
Specific valuation | 98,000 | 116,000 |
Average recorded investment in impaired loans during the period | 1,127,000 | 1,523,000 | 1,857,000
Interest income recognized on impaired loans | $ 48,000 | $ 64,000 | $ 76,000

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