Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities
Net income	$ 358,685	$ 269,105	$ 346,540
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation, amortization and accretion, net	36,798	34,570	40,987
Net (gains) losses on sale or disposal of premises and equipment	1,401	(1,658)	156
Net write-downs on premises and equipment	(121)	0	0
Provision for credit losses	58,793	142,656	71,697
Net write-downs and (gains) losses on sale of other real estate owned	532	(1,595)	(1,773)
Share-based compensation expense	13,440	9,950	6,706
Amortization of operating lease right of use assets	9,930	11,363	12,639
Provision for deferred taxes	(20,078)	(20,468)	(35,677)
Net (gain) loss on securities	(12,304)	304	(203)
Loan servicing asset impairment (recovery)	0	0	(21,824)
Originations of mortgage loans held for sale	(4,420,439)	(3,620,664)	(3,949,676)
Payments received on mortgage loans held for sale	20,479	15,269	23,324
Proceeds from sales of mortgage loans held for sale	4,179,314	3,695,259	4,493,742
Net (gains) losses on mortgage loans held for sale	(41,298)	2,072	93,133
Originations of SBA loans	(28,805)	(27,410)	(46,479)
Proceeds from sales of SBA loans	32,999	30,462	57,171
Net gains on sales of SBA loans	(4,194)	(1,557)	(5,552)
Increase in cash surrender value of bank owned life insurance	(12,298)	(8,777)	(7,305)
Gain on bank owned life insurance proceeds	(1,464)	(486)	(55)
Gain on sale of mortgage servicing rights	(10,494)	0	(1,356)
Loss (gain) on debt redemption	890	(1,148)	0
Increase in interest receivable	(747)	(9,662)	(20,125)
Increase (decrease) in interest payable	(11,176)	26,946	6,217
Increase in taxes payable	29,846	2,271	5,177
Change attributable to other operating activities	(25,496)	22,157	(4,991)
Net cash provided by operating activities	154,193	568,959	1,062,473
Investing Activities, net of effects of business combinations
Purchases of securities available-for-sale	(693,401)	(30,548)	(1,172,323)
Purchases of securities held-to-maturity	(26,071)	(8,543)	(57,408)
Proceeds from prepayments and maturities of securities available-for-sale	434,711	142,082	186,849
Proceeds from prepayments and maturities of securities held-to-maturity	3,084	2,082	2,357
Proceeds from sale of securities available-for-sale	0	5,141	0
Net (increase) decrease in other investments	16,712	38,112	(63,959)
Net increase in loans	(610,502)	(485,459)	(3,345,287)
Purchase of loan pool	0	0	(472,266)
Proceeds from sale of mortgage servicing rights	82,328	0	119,845
Purchases of premises and equipment	(13,477)	(17,531)	(13,568)
Proceeds from sale of premises and equipment	250	3,925	46
Proceeds from sales of other real estate owned	14,625	10,655	5,086
Purchase of bank owned life insurance	(110,000)	0	(50,000)
Proceeds from bank owned life insurance	55,059	1,890	101
Net cash proceeds paid in acquisitions	0	0	(14,003)
Net cash used in investing activities	(846,682)	(338,194)	(4,874,530)
Financing Activities, net of effects of business combinations
Net increase (decrease) in deposits	1,013,939	1,245,771	(202,815)
Net decrease in securities sold under agreements to repurchase	0	0	(5,845)
Proceeds from other borrowings	6,308,000	15,842,000	3,950,000
Repayment of other borrowings	(6,526,963)	(17,207,845)	(2,814,576)
Proceeds from exercise of stock options	0	476	2,799
Dividends paid - common stock	(41,460)	(41,649)	(41,610)
Purchase of treasury shares	(7,954)	(20,346)	(22,421)
Net cash provided by (used in) financing activities	745,562	(181,593)	865,532
Net increase (decrease) in cash, cash equivalents and restricted cash	53,073	49,172	(2,946,525)
Cash, cash equivalents and restricted cash at beginning of period	1,167,304	1,118,132	4,064,657
Cash, cash equivalents and restricted cash at end of period	1,220,377	1,167,304	1,118,132
Cash paid during the year for:
Interest	540,270	418,445	86,643
Income taxes	102,511	101,328	133,894
Loans transferred to other real estate owned	11,391	14,416	346
Loans transferred from loans held for sale to loans held for investment	14,677	0	196,891
Loans provided for the sales of other real estate owned	0	0	2,288
Right-of-use assets obtained in exchange for new operating lease liabilities	5,488	2,827	7,226
Assets acquired in business combination	0	0	3,216
Liabilities assumed in business combination	0	0	(10,787)
Change in unrealized gain (loss) on securities available-for-sale, net of tax	$ 5,820	$ 10,568	$ (62,097)