CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Operating Activities
Net income	$ 190,144	$ 222,927	$ 303,202
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	28,306	14,795	19,963
Net amortization of debt securities	13,153	15,506	29,587
Net amortization of purchase accounting adjustments and deferred loan fees and costs	(5,983)	(5,347)	2,789
Origination of loans held for sale	(665,181)	(435,649)	(743,212)
Proceeds from loans held for sale	738,134	549,778	844,940
Gain on sale of loans	(16,855)	(12,202)	(20,032)
Gain on sale of securities	(30)	(1,510)	(620)
Bank-owned life insurance income, net	(4,476)	(3,849)	(3,579)
Stock-based compensation, net of tax benefits	5,694	5,929	5,366
Depreciation and amortization of premises and equipment	28,907	27,412	25,830
(Gain) loss on dispositions of premises and equipment	(5,100)	160	(3,047)
Gain on sale and write-downs of other real estate owned, net	(1,124)	(321)	(121)
Deferred tax expense	2,608	507	2,177
Amortization of core deposit and other intangibles	12,757	9,731	10,658
Amortization of investments in variable interest entities	24,054	20,515	16,640
Net decrease (increase) in accrued interest receivable	877	(10,989)	(6,865)
Net decrease (increase) in other assets	8,856	(9,961)	(22,760)
Net (decrease) increase in accrued interest payable	(93,693)	121,576	1,922
Net (decrease) increase in other liabilities	(3,011)	(8,293)	7,822
Net cash provided by operating activities	258,037	500,715	470,660
Investing Activities
Sales of debt securities, available-for-sale	237,502	29,972	326,302
Maturities, prepayments and calls of available-for-sale debt securities	609,118	621,878	1,101,420
Purchases of available-for-sale debt securities	(50,148)	0	(471,581)
Maturities, prepayments and calls of held-to-maturity debt securities	204,645	209,909	211,700
Purchases of held-to-maturity debt securities	0	0	(523,060)
Termination of interest rate swaps	(19,825)	0	0
Principal collected on loans	4,007,266	2,946,294	5,432,753
Loan originations	(4,438,907)	(4,013,701)	(7,296,411)
Proceeds from sale of premises and equipment	14,375	251	10,525
Net additions to premises and equipment	(48,277)	(49,534)	(33,763)
Proceeds from sale of other real estate owned	2,337	391	1,014
Proceeds from redemption of non-marketable equity securities	149,873	630,584	366,467
Purchases of non-marketable equity securities	(233,288)	(559,601)	(438,398)
Proceeds from bank-owned life insurance	417	1,787	2,217
Investments in variable interest entities	(49,631)	(25,722)	(40,967)
Net cash received from acquisitions	107,684	0	0
Net cash provided by (used in) investing activities	493,141	(207,492)	(1,351,782)
Financing Activities
Net decrease in deposits	(394,570)	(676,652)	(729,707)
Net increase (decrease) in securities sold under agreements to repurchase	286,320	540,934	(74,878)
Net (decrease) increase in short-term Federal Home Loan Bank advances	(58,500)	(1,800,000)	1,800,000
Proceeds from short-term FRB Bank Term Funding	0	2,740,000	0
Repayments of short-term FRB Bank Term Funding	(2,740,000)	0	0
Proceeds from long-term Federal Home Loan Bank advances	1,800,000	0	0
Net increase in other borrowed funds	1,297	3,327	9,120
Cash dividends paid	(150,034)	(146,690)	(157,540)
Tax withholding payments for stock-based compensation	(1,625)	(1,795)	(1,704)
Proceeds from stock option exercises	0	0	140
Net cash (used in) provided by financing activities	(1,257,112)	659,124	845,431
Net (decrease) increase in cash, cash equivalents and restricted cash	(505,934)	952,347	(35,691)
Cash, cash equivalents and restricted cash at beginning of period	1,354,342	401,995	437,686
Cash, cash equivalents and restricted cash at end of period	848,408	1,354,342	401,995
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest	528,911	204,397	39,339
Cash paid during the period for income taxes	15,604	27,932	55,197
Supplemental Disclosure of Non-Cash Investing Activities
Transfer of debt securities from held-to-maturity to available-for-sale	0	0	2,154,475
Sale and refinancing of other real estate owned	6	22	0
Transfer of loans to other real estate owned	879	1,563	97
Right-of-use assets obtained in exchange for new lease liabilities	395	1,979	25,048
Equity investments obtained in exchange or delayed equity contributions	33,982	37,068	57,171
Dividends declared during the period but not paid	388	370	346
Acquisitions
Fair value of common stock shares issued	92,385	0	0
Cash consideration	26,009	0	0
Fair value of assets acquired	1,180,757	0	0
Liabilities assumed	$ 1,087,601	$ 0	$ 0