Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities
Net income	$ 264,319	$ 294,969
Adjustments reconciling net income to net cash provided by (used in) operating activities:
Depreciation	13,808	12,864
Net losses on sale or disposal of premises and equipment	92	3,200
Net write-downs on other assets	0	260
Provision for credit losses	38,807	(38,124)
Net write-downs and (gains) losses on sale of other real estate owned	(1,773)	(581)
Share-based compensation expense	4,859	5,884
Amortization of intangible assets	15,035	11,578
Amortization of operating lease right of use assets	8,783	12,389
Provision for deferred taxes	(21,699)	32,074
Net amortization of investment securities available-for-sale	407	2,534
Net amortization of investment securities held-to-maturity	71	14
Net amortization of other investments	556	0
Net gain on securities	(200)	(519)
Accretion of discount on purchased loans, net	(30)	(13,537)
Net amortization on other borrowings	324	330
Amortization of subordinated deferrable interest debentures	1,495	1,485
Loan servicing asset recovery	(21,824)	(9,990)
Originations of mortgage loans held for sale	(3,265,190)	(6,231,286)
Payments received on mortgage loans held for sale	21,657	38,178
Proceeds from sales of mortgage loans held for sale	3,919,672	5,752,055
Net (gains) losses on sale of mortgage loans held for sale	83,975	(126,533)
Originations of SBA loans	(44,664)	(51,155)
Proceeds from sales of SBA loans	53,961	54,861
Net gains on sale of SBA loans	(5,191)	(5,059)
Increase in cash surrender value of bank owned life insurance	(5,433)	(3,628)
Gain on bank owned life insurance proceeds	(55)	(603)
Net gains on other loans held for sale	0	(457)
Loss on sale of mortgage servicing rights	316	0
Change attributable to other operating activities	711	1,244
Net cash provided by (used in) operating activities	1,062,789	(257,553)
Investing Activities, net of effects of business combinations
Proceeds from maturities of time deposits in other banks	0	249
Purchases of securities available-for-sale	(894,260)	0
Purchases of investment securities held-to-maturity	(52,111)	(64,517)
Proceeds from maturities and paydowns of securities available-for-sale	147,291	281,244
Proceeds from maturities and paydowns of securities held-to-maturity	1,676	52
Net (increase) decrease in other investments	(13,364)	1,102
Net increase in loans	(2,764,936)	(215,289)
Purchases of premises and equipment	(11,307)	(21,990)
Proceeds from sale of premises and equipment	46	993
Proceeds from sales of other real estate owned	5,086	10,141
Proceeds from sale of mortgage servicing rights	119,845	0
Purchases of bank owned life insurance	(50,000)	(100,000)
Proceeds from bank owned life insurance	101	1,309
Payments received on other loans held for sale	0	9,136
Proceeds from sales of other loans held for sale	0	156,803
Net cash and cash equivalents paid in acquisitions	(14,003)	0
Net cash provided by (used in) investing activities	(3,525,936)	59,233
Financing Activities, net of effects of business combinations
Net increase (decrease) in deposits	(198,634)	1,875,666
Net decrease in securities sold under agreements to repurchase	(5,845)	(7,139)
Proceeds from other borrowings	350,000	0
Repayment of other borrowings	(364,539)	(110)
Proceeds from exercise of stock options	2,324	4,499
Dividends paid - common stock	(31,227)	(31,354)
Purchase of treasury shares	(22,421)	(8,108)
Net cash provided by (used in) financing activities	(270,342)	1,833,454
Net increase (decrease) in cash, cash equivalents and restricted cash	(2,733,489)	1,635,134
Cash, cash equivalents and restricted cash at beginning of period	4,064,657	2,117,306
Cash, cash equivalents and restricted cash at end of period	1,331,168	3,752,440
Cash paid during the period for:
Interest	42,040	35,389
Income taxes	82,551	55,651
Loans transferred to other real estate owned	346	2,274
Loans transferred from loans held for sale to loans held for investment	192,425	134,941
Loans provided for the sales of other real estate owned	2,288	1,052
Right-of-use assets obtained in exchange for new operating lease liabilities	1,537	10,270
Assets acquired in business acquisitions	10,641	0
Liabilities assumed in business acquisitions	(3,362)	0
Change in unrealized loss on securities available-for-sale, net of tax	$ (66,324)	$ (11,620)