CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
OPERATING ACTIVITIES:
Net income	$ 82,355	$ 70,715
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization on investment securities and low-income housing investments	4,617	4,176
Net accretion and amortization on loans	(2,266)	(2,756)
Unrealized and realized losses on equity securities with readily determinable fair value	(65)	(26)
Depreciation of premises and equipment	5,278	4,930
Amortization of mortgage servicing rights	1,271	1,440
Provision for on-balance sheet exposures	41,425	36,635
Provision for off-balance sheet exposures	(340)	90
Net gain on sale of mortgage loans held for sale	(2,430)	(1,453)
Origination of mortgage loans held for sale	(137,891)	(53,750)
Proceeds from sale of mortgage loans held for sale	135,022	53,794
Net gain on sale of consumer loans held for sale	(11,221)	(8,880)
Origination of consumer loans held for sale	(940,901)	(756,714)
Proceeds from sale of consumer loans held for sale	950,249	761,497
Net gain realized on sale of other real estate owned	(4)
Writedowns of other real estate owned	158	158
Deferred compensation expense - Class A Common Stock	1,180	844
Stock-based awards and ESPP expense - Class A Common Stock	714	1,407
Amortization of right-of-use assets	4,076	4,590
Repayment of operating lease liabilities	(4,024)	(4,580)
Increase in cash surrender value of bank owned life insurance	(2,372)	(1,324)
Gain from death benefits received in excess of cash surrender value of BOLI		(1,728)
Net change in other assets and liabilities:
Accrued interest receivable	557	(5,366)
Accrued interest payable	1,106	1,778
Other assets	(7,687)	(25,675)
Other liabilities	6,666	6,452
Net cash provided by operating activities	125,473	86,254
INVESTING ACTIVITIES:
Net cash proceeds paid in acquisition		(40,970)
Purchases of available-for-sale debt securities	(110,000)	(30,000)
Purchases of held-to-maturity debt securities		(25,000)
Proceeds from calls, maturities and paydowns of equity and available-for-sale debt securities	246,769	67,571
Proceeds from calls, maturities and paydowns of held-to-maturity debt securities	65,483	10,736
Net change in outstanding warehouse lines of credit	(255,440)	(54,472)
Net change in other loans	92,377	(323,283)
Proceeds from sale of mortgage loans transferred to held for sale	67,176
Net purchases of Federal Home Loan Bank stock	(211)	(22,274)
Proceeds from sale of other real estate owned	172
Proceeds of principal and earnings from bank-owned life insurance		1,528
Investments in low-income housing tax partnerships	(10,018)	10,221
Net purchases of premises and equipment	(4,874)	(5,278)
Net cash (used in) provided by investing activities	91,434	(411,221)
FINANCING ACTIVITIES:
Net change in deposits	48,533	34,059
Net change in securities sold under agreements to repurchase and other short-term borrowings	(18,235)	(136,159)
Payments of Federal Home Loan Bank advances	(815,000)	(538,000)
Proceeds from Federal Home Loan Bank advances	805,000	908,000
Repurchase of Class A Common Stock		(16,110)
Net proceeds from Class A Common Stock purchased through employee stock purchase plan	490	514
Net proceeds from option exercises and equity awards vested - Class A Common Stock	(694)	(194)
Cash dividends paid	(22,703)	(21,179)
Net cash (used in) provided by financing activities	(2,609)	230,931
NET CHANGE IN CASH AND CASH EQUIVALENTS	214,298	(94,036)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	316,567	313,689
CASH AND CASH EQUIVALENTS AT END OF PERIOD	530,865	219,653
Cash paid during the period for:
Interest	92,013	41,504
Income taxes	20,955	17,279
SUPPLEMENTAL NONCASH DISCLOSURES:
Mortgage servicing rights capitalized	913	381
Transfers from loans to real estate acquired in settlement of loans	169	2
Net transfers from loans held for investment to loans held for sale	67,176
New unfunded obligations in low-income-housing investments	11,000	27,000
Right-of-use assets recorded	$ 5,282	$ 3,480