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Derivative Financial Instruments, Agency Business (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Derivative Financial Instruments
Notional Value, classified in Other Assets	$ 173,532	$ 400,661
Notional Value, classified in Other Liabilities	347,701	108,625
Net gains (losses) from changes in the fair value of derivatives	7,800	6,000	$ 1,400
Income from mortgage servicing rights	90,761	98,839	$ 76,820
Agency Business
Derivative Financial Instruments
Notional Value, classified in Other Assets	848,633	509,286
Fair Value, classified in Other Assets	1,435	6,113
Fair Value, classified in Other Liabilities	$ (3,097)	$ (732)
Swap Futures
Derivative Financial Instruments
Derivative, maturity term	3 months
Swap Futures | Minimum
Derivative Financial Instruments
Derivative Swap Rate Period	5 years
Swap Futures | Maximum
Derivative Financial Instruments
Derivative Swap Rate Period	10 years
Swap Futures | Agency Business | Other Income
Derivative Financial Instruments
Realized gain (loss) on derivatives	$ 4,600
Unrealized gain (loss) on derivatives	1,500
Swap Futures | Structured Business | Other Income
Derivative Financial Instruments
Realized gain (loss) on derivatives	(400)
Unrealized gain (loss) on derivatives	$ 200
Non-Qualifying | Rate lock commitments | Agency Business
Derivative Financial Instruments
Count | item	5	4
Notional Value, classified in Other Assets	$ 37,657	$ 18,161
Fair Value, classified in Other Assets	1,066	324
Fair Value, classified in Other Liabilities	$ (202)	$ (95)
Non-Qualifying | Forward Sale Commitments | Agency Business
Derivative Financial Instruments
Count | item	79	90
Notional Value, classified in Other Assets	$ 483,576	$ 491,125
Fair Value, classified in Other Assets	369	5,789
Fair Value, classified in Other Liabilities	$ (2,895)	$ (637)
Non-Qualifying | Swap Futures | Agency Business
Derivative Financial Instruments
Count | item	3,274
Notional Value, classified in Other Assets	$ 327,400
Non-Qualifying | Swap Futures | Structured Business
Derivative Financial Instruments
Count | item	271
Notional Value, classified in Other Assets	$ 27,100

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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