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Mortgage Loan Servicing, Origination, and Loans Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Mortgage Loan Servicing, Origination, and Loans Held for Sale
Residential mortgages serviced for others	$ 6,600,000		$ 6,600,000
Contractually specified servicing fees earned	4,100	$ 3,800
Mortgage servicing rights	85,406		$ 86,610
Changes in the fair value of MSRs and its offsetting hedge.
(Decrease) increase in fair value of MSRs	(1,290)	12,827
Decay of MSRs	(1,409)	(2,230)
Gain (loss) related to derivatives	145	(11,838)
Net effect on Consolidated Statements of Net Income	$ (2,554)	$ (1,241)
Characteristics and sensitivity analysis of the MSR
Composition of residential loans serviced for others	100.00%		100.00%
Weighted average life (in years)	8 years 2 months 26 days		8 years 4 months 13 days
Constant Prepayment rate (CPR) (as a percent)	6.60%		6.40%
Weighted average discount rate (as a percent)	10.00%		10.00%
Effect on fair value due to change in interest rates:
25 basis point increase	$ 1,012		$ 774
50 basis point increase	1,888		1,428
25 basis point decrease	(1,146)		(902)
50 basis point decrease	$ (2,422)		$ (1,938)
Fixed-rate mortgage loans
Characteristics and sensitivity analysis of the MSR
Composition of residential loans serviced for others	100.00%		100.00%

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The hypothetical financial impact of a 25 basis point decrease in interest rates on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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The hypothetical financial impact of a 25 basis point increase in interest rates on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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The hypothetical financial impact of a 50 basis point decrease in interest rates on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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Amount of increase (decrease) in fair value from changes in the assumptions or model used to calculate the fair value of a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

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Amount of increase (decrease) in fair value from changes in the inputs used to calculate the fair value 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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Amount of increase (decrease) in fair value from changes classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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The increase (decrease) in the fair value of servicing assets that are subsequently measured at fair value.

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Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

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Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

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Weighted average life of financial assets and financial liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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