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Mortgage Servicing Rights Summary of Changes in Mortgage Servicing Rights (Details) - Mortgage - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Amortized cost: |  |
Balance at beginning of year | $ 38,822 | $ 40,944
Originations of mortgage servicing rights | 4,968 | 5,485
Amortization expense | (6,127) | (7,607)
Balance at end of year | 37,663 | 38,822
Valuation allowance: |  |
Balance at beginning of year | (1,291) | 0
Net deductions (additions) to the valuation allowance | 1,291 | (1,291)
Balance at end of year | 0 | (1,291)
Net MSRs at end of year | 37,663 | $ 37,531
Amortization [Abstract] |  |
2017 | 6,342 |
2018 | 5,905 |
2019 | 5,423 |
2020 | 4,893 |
2021 | $ 4,311 |

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- Definition Amortized amount 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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