CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net income	$ 269,025,000	$ 222,648,000	$ 271,605,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (recovery of) credit losses	88,071,000	48,089,000	(117,087,000)
Depreciation of premises and equipment, net	17,508,000	24,152,000	15,410,000
Accretion of fees, premiums and discounts, net	(27,376,000)	(28,378,000)	(38,257,000)
Amortization of intangible assets	15,527,000	18,401,000	10,583,000
Amortization of right of use lease asset	15,567,000	17,990,000	11,844,000
Decrease in operating lease liability	(12,417,000)	(16,291,000)	(11,941,000)
Income from mortgage banking activities, net	(4,799,000)	(7,271,000)	(23,216,000)
Gain on sale of securities, net	0	0	(331,000)
Loss (gain) on sale of other real estate owned and valuation adjustments, net	195,000	(221,000)	(385,000)
Stock-based compensation expense	9,605,000	6,349,000	5,694,000
Unrealized gains on equity investments, net	(329,000)	(5,980,000)	(5,141,000)
Realized (gain) loss on sale of equity investment, net	(9,493,000)	0	706,000
Deferred income tax (benefit) expense	(5,397,000)	(4,005,000)	39,838,000
(Increase) decrease in accrued interest receivable	(11,531,000)	(22,151,000)	2,739,000
Increase in other assets	(2,185,000)	(58,852,000)	(46,378,000)
Origination of loans held-for-sale	(280,826,000)	(527,684,000)	(971,863,000)
Proceeds from sales of loans held-for-sale	198,920,000	501,186,000	991,411,000
Increase (decrease) in accrued interest payable	41,510,000	1,196,000	(714,000)
(Decrease) increase in other liabilities	(60,781,000)	315,065,000	(4,807,000)
Decrease (increase) in value of bank-owned life insurance	(2,053,000)	(1,311,000)	(1,048,000)
Increase in capitalized interest, net	(1,738,000)	(2,078,000)	(3,014,000)
Net cash provided by operating activities	237,003,000	480,854,000	125,648,000
Investing activities:
Purchases of investment securities held to maturity	0	(120,868,000)	0
Repayments, maturities and calls of investment securities held to maturity	72,966,000	66,186,000	20,365,000
Sale of investment securities available-for-sale	0	0	14,051,000
Purchases of investment securities available-for-sale	(27,689,000)	(1,218,022,000)	(3,490,596,000)
Repayments of investment securities available-for-sale	354,783,000	1,015,603,000	697,480,000
Proceeds from bank-owned life insurance death benefit	3,772,000	1,437,000	0
Proceeds from bank-owned life insurance surrender	51,981,000	0	0
Net proceeds from sale of equity investments	17,946,000	0	4,899,000
Net cash (paid for) from business combinations	(3,000,000)	573,745,000	0
Net (increase) decrease in loans and leases	(486,819,000)	(41,324,000)	1,453,471,000
Purchases of loans held for investment	(313,363,000)	(393,159,000)	(188,076,000)
Purchases of FHLB stock	(134,279,000)	(51,518,000)	(625,000)
Redemption of FHLB stock	142,997,000	36,207,000	323,000
Sales of assets acquired through foreclosure, net	833,000	1,964,000	2,489,000
Sale of premise and equipment	17,000	1,191,000	427,000
Investment in premises and equipment, net	(6,406,000)	(8,809,000)	(6,576,000)
Net cash used in investing activities	(326,261,000)	(137,367,000)	(1,492,368,000)
Financing activities:
Net (decrease) increase in demand and saving deposits	(358,115,000)	(1,123,468,000)	1,760,031,000
Increase (decrease) in time deposits	681,484,000	(94,251,000)	(169,871,000)
(Decrease) increase in brokered deposits	(70,915,000)	61,705,000	(202,625,000)
Receipts from FHLB advances	7,195,000,000	1,873,100,000	1,000,000
Repayments of FHLB advances	(7,545,000,000)	(1,523,100,000)	(7,623,000)
Receipts from federal funds purchased	7,713,000,000	2,730,001,000	0
Repayments of federal funds purchased	(7,713,000,000)	(2,730,001,000)	0
Receipts from Bank Term Funding Program	565,000,000	0	0
Distributions to noncontrolling shareholders	(4,463,000)	(504,000)	0
Cash dividend	(36,742,000)	(35,746,000)	(24,242,000)
Issuance of common stock and exercise of common stock options	3,298,000	3,179,000	1,522,000
Redemption of senior and subordinated debt	(30,000,000)	0	(100,000,000)
Repurchase of common shares	(54,647,000)	(200,083,000)	(13,268,000)
Net cash provided by (used in) financing activities	344,900,000	(1,039,168,000)	1,244,924,000
Increase (decrease) in cash, cash equivalents, and restricted cash	255,642,000	(695,681,000)	(121,796,000)
Cash, cash equivalents, and restricted cash at beginning of period	837,258,000	1,532,939,000	1,654,735,000
Cash, cash equivalents, and restricted cash at end of period	1,092,900,000	837,258,000	1,532,939,000
Supplemental disclosure of cash flow information:
Cash paid for interest during the period	209,909,000	36,487,000	23,434,000
Cash paid for income taxes, net	99,136,000	58,148,000	40,691,000
Non-cash information:
Loans transferred to other real estate owned	1,569,000	630,000	1,972,000
Loans transferred to portfolio from held-for-sale at fair value	96,312,000	97,848,000	72,621,000
Securities transferred to held-to-maturity from available-for-sale at fair value	0	931,421,000	0
Available-for-sale securities purchased, not settled	0	0	34,489,000
Receivable for bank-owned life insurance surrender proceeds	4,731,000	0	0
Receivable for bank-owned life insurance death benefit proceeds	742,000	0	0
Fair value of assets acquired, net of cash received	7,993,000	4,713,544,000	0
Fair value of liabilities assumed	$ 4,993,000	$ 4,379,273,000	$ 0