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Loan Servicing - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Serviced sold mortgage loans | $ 1,389,000 | $ 1,371,000 | $ 1,330,000
Serviced sold mortgage loans with recourse | 2,500 | 3,000 | 4,100
Mortgage loans sold with recourse, reserve | $ 60 | $ 300 |
Mortgage servicing rights, discount rate | 12.00% | 13.00% |
Minimum |  |  |
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Mortgage servicing rights, constant prepayment speeds | 4.80% | 6.50% |
Maximum |  |  |
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Mortgage servicing rights, constant prepayment speeds | 17.80% | 17.10% |
Mortgages [Member] |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Servicing Asset at Amortized Cost, Fair Value | $ 10,971 | $ 9,692 |
Bank Servicing [Member] |  |  |
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 14,266 | 13,162 | 14,419
Real Estate Loan [Member] | Bank Servicing [Member] |  |  |
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 3,600 | $ 3,500 | $ 3,400

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
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