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Mortgage Servicing Rights - Loans, Fees, Amortization and Carrying Value (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Other Intangible Assets |  |  |  |  |
Unpaid principal amount of consumer loans serviced for others | $ 1,800,000 |  | $ 1,800,000 |  | $ 2,200,000
Contractually specified fees, late charges, and ancillary fees | 1,100 | $ 1,400 | 3,700 | $ 4,400 |
Amortization of mortgage servicing rights | 1,001 | $ 1,402 | 2,830 | $ 4,681 |
Details of MSRs |  |  |  |  |
Gross carrying amount | 69,062 |  | 69,062 |  | 67,856
Less: accumulated amortization | 59,955 |  | 59,955 |  | 57,125
Net carrying value | 9,107 |  | 9,107 |  | $ 10,731
MSRs |  |  |  |  |
Estimated future amortization expenses for MSRs over the next five years |  |  |  |  |
Under one year | 1,860 |  | 1,860 |  |
One to two years | 1,434 |  | 1,434 |  |
Two to three years | 1,142 |  | 1,142 |  |
Three to four years | 926 |  | 926 |  |
Four to five years | $ 763 |  | $ 763 |  |

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- Definition Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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