Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating Activities
Net income	$ 203,171	$ 264,319
Adjustments reconciling net income to net cash provided by (used in) operating activities:
Depreciation	14,260	13,808
Net losses on sale or disposal of premises and equipment	97	92
Provision for credit losses	119,704	38,807
Net write-downs and (gains) losses on sale of other real estate owned	(1,597)	(1,773)
Share-based compensation expense	7,415	4,859
Amortization of intangible assets	13,819	15,035
Amortization of operating lease right of use assets	8,440	8,783
Provision for deferred taxes	(13,382)	(21,699)
Net (accretion) amortization of debt securities available-for-sale	(4,316)	407
Net (accretion) amortization of debt securities held-to-maturity	(136)	71
Net amortization of other investments	1,108	556
Net (gain) loss on securities	16	(200)
Accretion of discount on purchased loans, net	(1,361)	(30)
Net amortization on other borrowings	774	324
Amortization of subordinated deferrable interest debentures	1,495	1,495
Loan servicing asset recovery	0	(21,824)
Originations of mortgage loans held for sale	(2,818,898)	(3,265,190)
Payments received on mortgage loans held for sale	11,806	21,657
Proceeds from sales of mortgage loans held for sale	2,802,956	3,919,672
Net losses on sale of mortgage loans held for sale	4,447	83,975
Originations of SBA loans	(24,252)	(44,664)
Proceeds from sales of SBA loans	27,129	53,961
Net gains on sale of SBA loans	(1,382)	(5,191)
Increase in cash surrender value of bank owned life insurance	(6,768)	(5,433)
Gain on bank owned life insurance proceeds	(486)	(55)
Loss on sale of mortgage servicing rights	0	316
Gain on debt redemption	(1,148)	0
Change attributable to other operating activities	13,157	711
Net cash provided by operating activities	356,068	1,062,789
Investing Activities, net of effects of business combinations
Purchases of debt securities available-for-sale	(500)	(894,260)
Purchases of debt securities held-to-maturity	(8,543)	(52,111)
Proceeds from maturities and paydowns of debt securities available-for-sale	61,394	147,291
Proceeds from sales of debt securities available-for-sale	216	0
Proceeds from maturities and paydowns of debt securities held-to-maturity	1,684	1,676
Net (increase) decrease in other investments	4,911	(13,364)
Net increase in loans	(400,486)	(2,764,936)
Purchases of premises and equipment	(11,680)	(11,307)
Proceeds from sale of premises and equipment	42	46
Proceeds from sales of other real estate owned	8,756	5,086
Proceeds from sale of mortgage servicing rights	0	119,845
Purchases of bank owned life insurance	0	(50,000)
Proceeds from bank owned life insurance	1,890	101
Net cash and cash equivalents paid in acquisitions	0	(14,003)
Net cash used in investing activities	(342,316)	(3,525,936)
Financing Activities, net of effects of business combinations
Net increase (decrease) in deposits	1,127,607	(198,634)
Net decrease in securities sold under agreements to repurchase	0	(5,845)
Proceeds from other borrowings	13,837,000	350,000
Repayment of other borrowings	(14,502,809)	(364,539)
Proceeds from exercise of stock options	476	2,324
Dividends paid - common stock	(31,308)	(31,227)
Purchase of treasury shares	(17,077)	(22,421)
Net cash provided by (used in) financing activities	413,889	(270,342)
Net increase (decrease) in cash, cash equivalents and restricted cash	427,641	(2,733,489)
Cash, cash equivalents and restricted cash at beginning of period	1,118,132	4,064,657
Cash, cash equivalents and restricted cash at end of period	1,545,773	1,331,168
Cash paid (received) during the period for:
Interest	290,972	42,040
Income taxes	88,353	82,551
Loans transferred to other real estate owned	9,713	346
Loans transferred from loans held for sale to loans held for investment	8,806	192,425
Loans provided for the sales of other real estate owned	0	2,288
Right-of-use assets obtained in exchange for new operating lease liabilities	2,678	1,537
Assets acquired in business acquisitions	0	10,641
Liabilities assumed in business acquisitions	0	(3,362)
Change in unrealized loss on securities available-for-sale, net of tax	$ (14,311)	$ (66,324)