CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 51,873	$ 61,605	$ 94,962	$ 114,419
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			12,964	13,671
Provision (benefit) for credit losses			6,491	(7,728)
Net amortization of premium on securities			38,332	18,439
Securities gains, net	2,089	(2,842)	(783)	(2,812)
Unrealized loss on equity securities, net			404	27
Stock based compensation			5,090	4,776
Loans originated for sale			(180,072)	(244,752)
Proceeds on sales of loans held for sale			188,317	279,923
Net gains on sale of loans held for sale			(5,408)	(10,470)
(Increase) decrease in accrued interest receivable			(280)	813
Decrease in prepaid expenses			(2,194)	(1,324)
Decrease in accrued interest payable			(91)	(1,342)
Capitalization of servicing rights			(904)	(703)
Valuation adjustment on servicing rights	0	526	(1,658)	(391)
(Gain) loss on sales/valuations of assets, net			(139)	377
Net excess tax benefit from stock based compensation			129	303
Other, net			33,327	(9,645)
NET CASH PROVIDED BY OPERATING ACTIVITIES			188,487	153,581
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of time deposits in other financial institutions			0	(9)
Proceeds from the sale of securities available for sale	149,840	423,415	973,911	630,481
Proceeds from the sale of securities held to maturity			2,337	0
Proceeds from the maturity of and principal paydowns on securities available for sale			565,196	484,958
Proceeds from the maturity of and principal paydowns on securities held to maturity			1,286	4,127
Proceeds from the maturity of time deposits in other financial institutions			1,039	0
Proceeds from the sale, maturity of, redemption of and principal paydowns on other investments			6,715	2,498
Purchase of securities available for sale			(1,788,922)	(1,571,281)
Purchase of other investments			(8,714)	(4,054)
Net (increase) decrease in loans			(752,767)	5,203
Purchase of bank owned life insurance policies			(201)	(190)
Proceeds from bank owned life insurance policies			502	0
Capital expenditures			(8,181)	(11,539)
Proceeds from the sale of equipment			4,264	3,090
Net cash expended in divestitures			(50,616)	0
Proceeds on sale of OREO and other repossessed assets			1,927	1,858
NET CASH USED BY INVESTING ACTIVITIES			(1,052,224)	(454,858)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in demand deposits			(392,811)	610,479
Net increase in savings deposits			1,203,729	169,519
Net increase (decrease) in time deposit accounts			61,228	(144,785)
Net decrease in short-term borrowings			(33,848)	(15,309)
Proceeds from short term advances			141,000	1,700
Repayments of short term advances			(141,000)	(1,700)
Repayments of other borrowings			(168)	(186,356)
Proceeds from issuance of common stock			1,682	1,519
Dividends paid			(26,880)	(22,565)
NET CASH PROVIDED BY FINANCING ACTIVITIES			812,932	412,502
Net increase (decrease) in cash and cash equivalents			(50,805)	111,225
Cash and cash equivalents at beginning of year			435,599	337,903	$ 337,903
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 384,794	$ 449,128	384,794	449,128	$ 435,599
Supplemental disclosures:
Cash paid for income/franchise taxes			17,457	31,735
Cash paid for interest			17,100	16,053
Loans transferred to OREO			4,684	1,186
Transfer of premises from premises, furniture and equipment, net, to premises, furniture and equipment held for sale			4,061	1,564
Transfer of premises from premises, furniture and equipment held for sale to premises, furniture and equipment, net			0	6
Dividends declared, not paid			2,013	2,013
Purchases of securities available for sale, accrued, not settled			$ 7,420	$ 0