Other Assets - Loans, Fees, Amortization and Carrying Value (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Intangible Assets
Unpaid principal amount of consumer loans serviced for others	$ 2,344,899	$ 2,664,860
Contractually specified fees, late charges, and ancillary fees	6,300	7,000	$ 6,500
Amortization of mortgage servicing rights	3,625	3,813	$ 3,600
MSRs
Estimated future amortization expenses for MSRs, next five years
2020	2,129
2021	1,808
2022	1,530
2023	1,295
2024	1,101
Details of MSRs
Gross carrying amount	63,480	63,342
Less: accumulated amortization	50,812	47,187
Net carrying value	$ 12,668	$ 16,155

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.

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Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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