CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
OPERATING ACTIVITIES:
Net income	$ 71,310	$ 69,984
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization on investment securities and low-income housing investments	3,753	3,678
Net accretion and amortization on loans	(3,026)	(12,650)
Unrealized and realized losses on equity securities with readily determinable fair value	204	505
Depreciation of premises and equipment	5,884	6,747
Amortization of mortgage servicing rights	1,773	2,617
Recovery of mortgage servicing rights		(500)
Provision for on-balance sheet exposures	14,504	12,231
Provision for off-balance sheet exposures	128	(52)
Net gain on sale of mortgage loans held for sale	(4,704)	(16,339)
Origination of mortgage loans held for sale	(195,006)	(525,246)
Proceeds from sale of mortgage loans held for sale	226,191	562,661
Net gain on sale of consumer loans held for sale	(10,466)	(7,889)
Origination of consumer loans held for sale	(820,127)	(561,062)
Proceeds from sale of consumer loans held for sale	831,802	558,972
Net gain realized on sale of other real estate owned		(51)
Writedowns of other real estate owned	158	158
Deferred compensation expense - Class A Common Stock	944	808
Stock-based awards and ESPP expense - Class A Common Stock	1,397	1,178
Net gain on sale of bank premises and equipment		(399)
Increase in cash surrender value of bank owned life insurance	(1,852)	(1,616)
Net change in other assets and liabilities:
Accrued interest receivable	(1,225)	3,573
Accrued interest payable	34	(162)
Other assets	1,309	2,384
Other liabilities	12,117	(3,104)
Net cash provided by operating activities	135,102	96,426
INVESTING ACTIVITIES:
Purchases of available-for-sale debt securities	(244,820)	(141,571)
Proceeds from calls, maturities and paydowns of equity and available-for-sale debt securities	65,269	164,280
Proceeds from calls, maturities and paydowns of held-to-maturity debt securities	11,703	8,444
Net change in outstanding warehouse lines of credit	408,312	212,114
Net change in other loans	(212,312)	259,710
Proceeds from redemption of Federal Home Loan Bank stock	1,743	7,086
Proceeds from sales of other real estate owned		611
Proceeds from sale of bank premises and equipment		637
Purchase of bank owned life insurance		(30,000)
Investments in low-income housing tax partnerships	(7,258)	(8,277)
Net purchases of premises and equipment	(2,624)	(4,972)
Net cash provided by investing activities	20,013	468,062
FINANCING ACTIVITIES:
Net change in deposits	(39,910)	214,766
Net change in securities sold under agreements to repurchase and other short-term borrowings	(81,591)	49,557
Payments of Federal Home Loan Bank advances	(25,000)	(235,000)
Proceeds from Federal Home Loan Bank advances	20,000	25,000
Payoff of subordinated note, net of common security interest		(40,000)
Repurchase of Class A Common Stock	(12,164)	(34,907)
Net proceeds from Class A Common Stock purchased through employee stock purchase plan	433	435
Net proceeds from option exercises and equity awards vested - Class A Common Stock	40	(142)
Cash dividends paid	(19,501)	(18,537)
Net cash used in financing activities	(157,693)	(38,828)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(2,578)	525,660
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	756,971	485,587
CASH AND CASH EQUIVALENTS AT END OF PERIOD	754,393	1,011,247
Cash paid during the period for:
Interest	4,017	4,790
Income taxes	14,614	16,736
SUPPLEMENTAL NONCASH DISCLOSURES:
Mortgage servicing rights capitalized	1,755	3,889
Transfers from loans to real estate acquired in settlement of loans		64
Unfunded commitments in low-income-housing investments	16,100	24
Right-of-use assets recorded	$ 6,360	$ 263