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Loan Servicing (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Servicing Assets at Fair Value [Line Items] |  |  |
Serviced sold mortgage loans | $ 1,447,000 | $ 1,389,000 | $ 1,371,000
Serviced sold mortgage loans with recourse | 2,300 | 2,500 | 3,000
Mortgage loans sold with recourse, reserve | $ 25 | $ 60 |
Mortgage servicing rights, discount rate | 12.00% | 12.00% |
Bank Servicing [Member] |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 15,500 | $ 14,266 | 13,162
Bank Servicing [Member] | Real Estate Loan [Member] |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 3,600 | $ 3,600 | $ 3,500
Minimum |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Mortgage servicing rights, constant prepayment speeds | 6.60% | 4.80% |
Maximum |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Mortgage servicing rights, constant prepayment speeds | 18.42% | 17.82% |
Mortgages [Member] |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Servicing Asset at Amortized Cost, Fair Value | $ 10,100 | $ 11,000 |

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- Definition Estimated rate of prepayment of principal on financial assets for initial fair value measurement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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- Definition Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7516967&loc=d3e66267-113978 + Details
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