Consolidated Statements of Cash Flow (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 135,974,000	$ 129,462,000
Adjustments to reconcile to net cash provided by operating activities:
Provision for (benefit from) credit losses	6,300,000	(8,466,000)
Depreciation and amortization	16,602,000	14,574,000
Net amortization of securities premiums and discounts	3,002,000	3,069,000
Realized securities losses/(gains)	2,949,000	(417,000)
Gain on sales of loans	(3,891,000)	(5,737,000)
Cash receipts from the sale of loans originated for sale	207,972,000	294,387,000
Cash disbursements for loans originated for sale	(184,129,000)	(277,480,000)
Deferred income tax (benefit)/provision	(2,940,000)	4,662,000
Gain on sale of other assets	(4,185,000)	(2,991,000)
(Decrease)/increase in interest receivable	(11,703,000)	3,894,000
Increase in interest payable	528,000	69,000
Amortization of stock-based compensation arrangements	1,545,000	1,604,000
Excess tax benefit from stock-based compensation arrangements	(3,058,000)	(1,622,000)
Other, net	14,326,000	22,309,000
Net cash provided by operating activities	179,292,000	177,317,000
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid	121,099,000	12,442,000
Net cash paid from sale of assets and liabilities, net of cash received		(13,733,000)
Net (increase)/decrease in federal funds sold	(465,000)	15,000,000
Purchases of held for investment debt securities		(845,000)
Purchases of available for sale debt securities	(1,375,496,000)	(251,874,000)
Proceeds from maturities, calls and paydowns of held for investment debt securities	72,000	826,000
Proceeds from maturities, calls and paydowns of available for sale debt securities	48,300,000	306,231,000
Proceeds from sales of available for sale securities	222,474,000	0
Purchase of equity securities	(3,952,000)	(490,000)
Proceeds from paydowns and sales of equity securities	1,378,000	638,000
Net change in loans	(405,052,000)	561,540,000
Net payments on derivative asset contracts	(11,019,000)	(15,694,000)
Purchases of premises, equipment and computer software	(15,105,000)	(20,859,000)
Purchase of tax credits	(4,091,000)	(4,107,000)
Other, net	12,547,000	6,454,000
Net cash (used in) provided by investing activities	(1,409,310,000)	595,529,000
FINANCING ACTIVITIES
Net change in deposits	2,537,009,000	1,708,393,000
Net change in short-term borrowings	4,600,000	2,400,000
Proceeds from issuance of subordinated notes, net of debt issuance costs		59,150,000
Issuance of common stock in connection with stock options, net	7,011,000	1,722,000
Common stock acquired		(11,664,000)
Net cash settlement of options		(5,479,000)
Cash dividends paid	(35,319,000)	(33,414,000)
Net cash provided by financing activities	2,513,301,000	1,721,108,000
Net increase in cash, due from banks and interest-bearing deposits	1,283,283,000	2,493,954,000
Cash, due from banks and interest-bearing deposits at the beginning of the period	2,050,022,000	1,616,912,000
Cash, due from banks and interest-bearing deposits at the end of the period	3,333,305,000	4,110,866,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	20,154,000	8,356,000
Cash paid during the period for income taxes	26,780,000	27,800,000
Noncash investing and financing activities:
Cash consideration for acquisitions	77,685,000	21,000,000
Fair value of assets acquired in acquisitions	511,580,000	283,962,000
Liabilities assumed in acquisitions	433,896,000	258,165,000
Unpaid common stock dividends declared	$ 13,143,000	$ 11,802,000