Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage servicing rights	$ 57,259	$ 41,990	$ 72,532
Mortgage banking, net	(16,186)	17,704	$ 63
Equity Securities without Readily Determinable Fair Value, Amount	14,000	13,000
Equity securities	18,352	15,106
Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Equity Securities without Readily Determinable Fair Value, Amount	13,542	13,444
Equity securities	13,542	13,444
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
OREO(b)	21,299	6,125
Other noninterest expense	7,345	3,747
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Individually evaluated loans(a)	69,917	138,752
Provision for credit losses	(3,045)	97,519
Mortgage servicing rights	57,259	41,990
Mortgage banking, net	$ 16,186	$ (17,704)