Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ (9,451)	$ (10,578)
Mortgage servicing rights(e)			$ 57,259
Equity securities	14,000		14,000
Investment securities gains (losses), net	18,560		18,352
Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Equity securities	13,535		13,542
Investment securities gains (losses), net	13,535		13,542
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount	102		7,345
OREO(b)	985		21,299
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Individually evaluated loans(a)	43,882		69,917
Provision for credit losses	$ (397)		(3,045)
Mortgage Servicing Rights (MSR) Impairment (Recovery)			16,186
Mortgage servicing rights(e)			$ 57,259