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Loan Servicing - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Servicing Assets at Fair Value [Line Items] |  |  |
Mortgage Servicing Rights Fair Value | $ 9,299 | $ 9,593 |
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Serviced sold mortgage loans | 1,330,000 | 1,276,000 | $ 1,265,000
Serviced sold mortgage loans with recourse | 4,100 | 5,400 | 7,000
Mortgage loans sold with recourse, reserve | $ 266 | $ 500 |
Mortgage servicing rights, discount rate | 13.00% | 10.00% |
Servicing fees included in other service income | $ 3,400 | $ 3,400 | $ 3,500
Minimum |  |  |
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Mortgage servicing rights, constant prepayment speeds | 6.20% | 6.30% |
Maximum |  |  |
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Mortgage servicing rights, constant prepayment speeds | 16.80% | 22.00% |

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- Definition Estimated rate of prepayment of principal on financial assets for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=d3e107207-111719 + Details
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- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746 + Details
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- Definition Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13 (d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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