Consolidated Statements of Cash Flow - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 193,100,000	$ 167,630,000	$ 99,586,000
Adjustments to reconcile to net cash provided by operating activities:
Provision for (benefit from) credit losses	10,076,000	(8,690,000)	62,648,000
Depreciation and amortization	22,048,000	20,041,000	18,424,000
Net amortization of securities premiums and discounts	2,619,000	4,409,000	(94,000)
Realized securities losses (gains)	1,833,000	(1,047,000)	389,000
Gain on sales of loans	(4,548,000)	(7,282,000)	(6,067,000)
Cash receipts from the sale of loans originated for sale	246,499,000	369,301,000	415,589,000
Cash disbursements for loans originated for sale	(223,407,000)	(354,674,000)	(430,653,000)
Deferred income tax provision (benefit)	322,000	7,044,000	(9,491,000)
Gain on sale of other assets	(4,682,000)	(3,379,000)	(2,345,000)
(Increase)/decrease in interest receivable	(16,914,000)	4,214,000	(325,000)
Increase/(decrease) in interest payable	3,192,000	(617,000)	(1,641,000)
Stock-based compensation arrangements	1,941,000	2,133,000	1,516,000
Excess tax benefit from stock-based compensation arrangements	(3,325,000)	(1,932,000)	(500,000)
Other, net	(2,482,000)	6,783,000	7,818,000
Net cash provided by operating activities	226,272,000	203,934,000	154,854,000
INVESTING ACTIVITIES
Net cash received from acquisitions, net of cash paid	121,099,000	12,599,000	18,397,000
Net cash paid from sale of assets and liabilities, net of cash received		(13,733,000)
Net decrease in federal funds sold	563,000	14,200,000	1,000,000
Purchases of held for investment debt securities		(845,000)	(1,395,000)
Purchases of available for sale debt securities	(1,881,784,000)	(462,304,000)	(605,069,000)
Proceeds from maturities, calls and paydowns of held for investment debt securities	74,000	831,000	561,000
Proceeds from maturities, calls and paydowns of available for sale debt securities	550,018,000	506,737,000	547,729,000
Proceeds from sales of available for sale debt securities	222,474,000	0	0
Purchase of equity securities	(4,309,000)	(904,000)	(811,000)
Proceeds from paydowns and sales of equity securities	1,620,000	1,459,000	445,000
Net change in loans	(521,220,000)	404,393,000	(798,024,000)
Net receipts (payments) on derivative asset contracts	7,294,000	(14,146,000)	(513,000)
Purchases of premises, equipment and computer software	(19,785,000)	(27,251,000)	(66,446,000)
Purchase of tax credits	(9,706,000)	(7,456,000)	(2,200,000)
Other, net	14,494,000	9,305,000	7,820,000
Net cash (used in) provided by investing activities	(1,519,168,000)	422,885,000	(898,506,000)
FINANCING ACTIVITIES
Net change in deposits	2,452,297,000	(191,737,000)	536,063,000
Net change in short-term borrowings	300,000	(1,100,000)
Proceeds from long-term borrowings			3,000,000
Paydown of long-term borrowings			(3,000,000)
Issuance of common stock in connection with stock options, net	7,649,000	2,260,000	1,790,000
Common stock acquired		(11,663,000)	(3,098,000)
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	(48,462,000)	(45,140,000)	(42,472,000)
Net cash provided by (used in) financing activities	2,411,784,000	(193,709,000)	492,283,000
Net increase/(decrease) in cash, due from banks and interest-bearing deposits	1,118,888,000	433,110,000	(251,369,000)
Cash, due from banks and interest-bearing deposits at the beginning of the period	2,050,022,000	1,616,912,000	1,868,281,000
Cash, due from banks and interest-bearing deposits at the end of the period	3,168,910,000	2,050,022,000	1,616,912,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	42,930,000	11,993,000	22,056,000
Cash paid during the period for income taxes	34,640,000	30,600,000	26,525,000
Noncash investing and financing activities:
Cash consideration for acquisitions	77,685,000	21,000,000	2,861,000
Fair value of assets acquired in acquisitions	511,595,000	283,711,000	47,838,000
Liabilities assumed in acquisitions	433,911,000	257,915,000	45,040,000
Unpaid common stock dividends declared	$ 13,150,000	$ 11,737,000	$ 11,125,000