CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating activities:
Net income	$ 263,495	$ 269,025	$ 222,648
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	61,410	88,071	48,089
Depreciation of premises and equipment, net	13,875	17,508	24,152
Accretion of fees, premiums and discounts, net	(24,207)	(27,376)	(28,378)
Amortization of intangible assets	15,680	15,527	18,401
Amortization of right of use lease asset	10,147	15,567	17,990
Decrease in operating lease liability	(10,957)	(12,417)	(16,291)
Income from mortgage banking activities, net	(7,565)	(4,799)	(7,271)
Loss (gain) on sale of other real estate owned and valuation adjustments, net	296	195	(221)
Stock-based compensation expense	11,901	9,605	6,349
Unrealized gains on equity investments, net	0	(329)	(5,980)
Realized gain on sale of equity investment, net	(2,309)	(9,493)	0
Deferred income tax benefit	(8,162)	(5,397)	(4,005)
Decrease (increase) in accrued interest receivable	1,308	(11,531)	(22,151)
Increase in other assets	(106,041)	(2,185)	(58,852)
Origination of loans held-for-sale	(393,408)	(280,826)	(527,684)
Proceeds from sales of loans held-for-sale	319,658	198,920	501,186
(Decrease) increase in accrued interest payable	(8,511)	41,510	1,196
Increase (decrease) in other liabilities	85,291	(60,781)	315,065
(Increase) decrease in value of bank-owned life insurance	(531)	(2,053)	(1,311)
Increase in capitalized interest, net	(1,471)	(1,738)	(2,078)
Net cash provided by operating activities	219,899	237,003	480,854
Investing activities:
Purchases of investment securities held to maturity	0	0	(120,868)
Repayments, maturities and calls of investment securities held to maturity	61,332	72,966	66,186
Purchases of investment securities available-for-sale	(67,433)	(27,689)	(1,218,022)
Repayments of investment securities available-for-sale	350,388	354,783	1,015,603
Proceeds from bank-owned life insurance death benefit	112	3,772	1,437
Proceeds from bank-owned life insurance surrender	6,616	51,981	0
Net proceeds from sale of equity investments	0	17,946	0
Net cash (paid for) from business combinations	0	(3,000)	573,745
Net increase in loans and leases	(138,250)	(486,819)	(41,324)
Purchases of loans held for investment	(269,635)	(313,363)	(393,159)
Purchases of FHLB stock	(432,919)	(134,279)	(51,518)
Redemption of FHLB stock	436,512	142,997	36,207
Sales of assets acquired through foreclosure, net	803	833	1,964
Sale of premise and equipment	0	17	1,191
Investment in premises and equipment, net	(14,258)	(6,406)	(8,809)
Net cash used in investing activities	(66,732)	(326,261)	(137,367)
Financing activities:
Net increase (decrease) in demand and saving deposits	263,007	(358,115)	(1,123,468)
Increase (decrease) in time deposits	346,329	681,484	(94,251)
(Decrease) increase in brokered deposits	(51,676)	(70,915)	61,705
Receipts from FHLB advances	13,037,879	7,195,000	1,873,100
Repayments of FHLB advances	(12,986,839)	(7,545,000)	(1,523,100)
Receipts from federal funds purchased	1,525,001	7,713,000	2,730,001
Repayments of federal funds purchased	(1,525,001)	(7,713,000)	(2,730,001)
Receipts from Bank Term Funding Program	235,000	565,000	0
Repayments of Bank Term Funding Program	(800,000)	0	0
Distributions to noncontrolling shareholders	(3,299)	(4,463)	(504)
Cash dividend	(35,805)	(36,742)	(35,746)
Issuance of common stock and exercise of common stock options	466	3,298	3,179
Redemption of senior and subordinated debt	0	(30,000)	0
Repurchase of common shares	(96,311)	(54,647)	(200,083)
Net cash (used in) provided by financing activities	(91,249)	344,900	(1,039,168)
Increase (decrease) in cash, cash equivalents, and restricted cash	61,918	255,642	(695,681)
Cash, cash equivalents, and restricted cash at beginning of period	1,092,900	837,258	1,532,939
Cash, cash equivalents, and restricted cash at end of period	1,154,818	1,092,900	837,258
Supplemental disclosure of cash flow information:
Cash paid for interest during the period	366,655	209,909	36,487
Cash paid for income taxes, net	82,122	99,136	58,148
Non-cash information:
Loans transferred to other real estate owned	4,438	1,569	630
Loans transferred to portfolio from held-for-sale at fair value	57,813	96,312	97,848
Securities transferred to held-to-maturity from available-for-sale at fair value	0	0	931,421
Receivable for bank-owned life insurance surrender proceeds	0	4,731	0
Receivable for bank-owned life insurance death benefit proceeds	0	742	0
Premises & equipment transferred to held-for-sale	18,839	0	0
Fair value of assets acquired, net of cash received	0	7,993	4,713,544
Fair value of liabilities assumed	$ 0	$ 4,993	$ 4,379,273