Consolidated Statements of Cash Flow - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss)	$ 212,465,000	$ 193,100,000	$ 167,630,000
Adjustments to reconcile to net cash provided by operating activities:
Provision for/(benefit from) credit losses	7,458,000	10,076,000	(8,690,000)
Depreciation and amortization	22,189,000	22,048,000	20,041,000
Net amortization of securities premiums and discounts	(1,269,000)	2,619,000	4,409,000
Realized securities losses (gains)	1,828,000	1,833,000	(1,047,000)
Gain on sales of loans	(2,607,000)	(4,548,000)	(7,282,000)
Cash receipts from the sale of loans originated for sale	149,825,000	246,499,000	369,301,000
Cash disbursements for loans originated for sale	(144,476,000)	(223,407,000)	(354,674,000)
Deferred income tax (benefit) provision	(2,787,000)	322,000	7,044,000
Gain on sale of other real estate owned and other assets	(2,330,000)	(4,682,000)	(3,379,000)
(Increase)/decrease in interest receivable	(9,876,000)	(16,914,000)	4,214,000
Increase/(decrease) in interest payable	7,719,000	3,192,000	(617,000)
Stock-based compensation arrangements	2,999,000	1,941,000	2,133,000
Excess tax benefit from stock-based compensation arrangements	(899,000)	(3,325,000)	(1,932,000)
Other, net	(7,194,000)	(2,482,000)	6,783,000
Net cash provided by operating activities	233,045,000	226,272,000	203,934,000
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid	8,045,000	121,099,000	12,599,000
Net cash paid from sale of assets and liabilities, net of cash received			(13,733,000)
Net decrease in federal funds sold	1,534,000	563,000	14,200,000
Purchases of held for investment debt securities			(845,000)
Purchases of available for sale debt securities	(454,019,000)	(1,881,784,000)	(462,304,000)
Proceeds from maturities, calls and paydowns of held for investment debt securities	1,351,000	74,000	831,000
Proceeds from maturities, calls and paydowns of available for sale debt securities	467,601,000	550,018,000	506,737,000
Proceeds from sales of available for sale debt securities	0	222,474,000	0
Purchase of equity securities	(310,000)	(4,309,000)	(904,000)
Proceeds from paydowns and sales of equity securities	850,000	1,620,000	1,459,000
Net change in loans	(719,287,000)	(521,220,000)	404,393,000
Net receipts (payments) on derivative asset contracts	21,192,000	7,294,000	(14,146,000)
Purchases of premises, equipment and computer software	(22,504,000)	(19,785,000)	(27,251,000)
Purchase of tax credits	(7,635,000)	(9,706,000)	(7,456,000)
Other, net	33,477,000	14,494,000	9,305,000
Net cash (used in) provided by investing activities	(669,705,000)	(1,519,168,000)	422,885,000
FINANCING ACTIVITIES
Net change in deposits	(284,919,000)	2,452,297,000	(191,737,000)
Net change in short-term borrowings	3,051,000	300,000	(1,100,000)
Issuance of common stock in connection with stock options, net	2,543,000	7,649,000	2,260,000
Common stock acquired	(1,820,000)		(11,663,000)
Proceeds from issuance of subordinated notes, net of debt issuance costs			59,150,000
Net cash settlement of options			(5,479,000)
Cash dividends paid	(53,642,000)	(48,462,000)	(45,140,000)
Net cash (used in) provided by financing activities	(334,787,000)	2,411,784,000	(193,709,000)
Net (decrease)/increase in cash, due from banks and interest-bearing deposits	(771,447,000)	1,118,888,000	433,110,000
Cash, due from banks and interest-bearing deposits at the beginning of the period	3,168,910,000	2,050,022,000	1,616,912,000
Cash, due from banks and interest-bearing deposits at the end of the period	2,397,463,000	3,168,910,000	2,050,022,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	191,760,000	42,930,000	11,993,000
Cash paid during the period for income taxes	52,398,000	34,640,000	30,600,000
Noncash investing and financing activities:
Cash (received)/paid consideration for acquisitions	(7,833,000)	77,685,000	21,000,000
Fair value of assets acquired in acquisitions	2,981,000	511,595,000	283,711,000
Liabilities assumed in acquisitions	10,814,000	433,911,000	257,915,000
Unpaid common stock dividends declared	$ 14,161,000	$ 13,150,000	$ 11,737,000