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Mortgage Servicing Rights - Schedule of Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Transfers And Servicing [Abstract] |  |  |  |
Carrying value prior to policy change | $ 47,593 | $ 36,611 | $ 32,070 | $ 29,711
Fair value impact of change in accounting policy (See Note 1) |  |  | 1,011 |
Carrying value at beginning of period | 47,593 | 36,611 | 33,081 | 29,711
Capitalization | 14,646 | 10,653 | 29,659 | 19,783
Amortization |  | (1,968) |  | (3,425)
Sales | (11,935) |  | (11,935) |
Impairment |  | (4,914) |  | (5,687)
Change in fair value: |  |  |  |
Due to pay-offs/pay-downs | (532) |  | (797) |
Due to change in valuation inputs or assumptions | (1,308) |  | (1,544) |
Carrying value at June 30 | $ 48,464 | $ 40,382 | $ 48,464 | $ 40,382

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- Definition Amount of other-than-temporary impairment (OTTI) applied to 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 50 -Paragraph 4 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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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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