Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net income	$ 118,782	$ 151,995	$ 154,885
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	25,274	17,147	(8,257)
Depreciation and amortization of premises and equipment	10,695	10,155	9,896
Net amortization on securities	2,736	3,460	5,832
Amortization of intangible assets	4,734	2,263	2,808
Amortization of operating lease right-of-use assets	6,843	6,643	7,176
Excess tax benefit on stock-based compensation	(296)	(288)	(385)
Stock-based compensation expense	5,102	4,530	4,414
Bank owned life insurance income	(6,750)	(6,044)	(6,217)
Amortization of subordinated debt issuance costs	437	437	438
Discount on repurchase of subordinated debt	0	(106)	0
Proceeds from sale of loans held for sale	53,969	5,674	55,065
Originations of loans held for sale	(55,960)	(5,475)	(54,608)
Net gain on sale of loans held for sale	(156)	(122)	(361)
Net security losses (gains)	9,315	1,131	(566)
Net (gains) losses on sale of other real estate owned	(69)	(259)	182
Impairment of a minority interest equity investment	4,750	0	0
Net deferred income tax expense (benefit)	5,958	(19,850)	864
Net change in other assets and other liabilities	(27,907)	11,932	(11,981)
Net cash provided by operating activities	157,457	183,223	159,185
Investing activities
Net cash provided by (used in) acquisitions	44,564	(2,616)	(1,550)
Securities available for sale:
Proceeds from maturities, calls and principal paydowns	116,453	213,722	395,386
Proceeds from sales	124,577	0	0
Purchases	0	(264,569)	(775,963)
Securities held to maturity:
Proceeds from maturities, calls and principal paydowns	100,954	177,554	181,620
Purchases	(88,022)	(365,033)	(299,014)
Equity securities:
Proceeds from calls	0	0	1,000
Purchases	(11)	(1,000)	0
Other:
Net increase in loans	(338,111)	(659,949)	(9,305)
Proceeds from Federal Home Loan Bank stock redemption	91,535	36,125	2,422
Purchases of Federal Reserve and Federal Home Loan Bank stock	(90,945)	(55,740)	(167)
Proceeds from settlement of bank owned life insurance	3,766	1,873	4,413
Purchases of bank owned life insurance	0	0	(40,000)
Purchases of premises and equipment, net	(9,254)	(7,009)	(7,740)
Proceeds from sales of other real estate owned	268	426	1,290
Net cash (used in) provided by investing activities	(44,226)	(926,216)	(547,608)
Financing activities
Net increase (decrease) in deposits	164,085	(738,536)	1,152,777
Net (decrease) increase in short-term borrowings	(231,743)	487,217	(70,592)
Repurchase of subordinated debt	0	(2,000)	0
Proceeds from long-term debt	25,000	1,519	0
Repayments of long-term debt	(118)	(10,699)	(25,101)
Proceeds from the issuance of shares to employee and other stock plans	91	0	112
Cash paid by employer for tax-withholding on stock issuance	(1,877)	(1,751)	(2,931)
Purchase of treasury stock	(4,944)	(14,713)	(21,714)
Cash dividends	(55,886)	(49,765)	(47,738)
Net cash (used in) provided by financing activities	(105,392)	(328,728)	984,813
Net increase (decrease) in cash and cash equivalents	7,839	(1,071,721)	596,390
Cash and cash equivalents at beginning of year	197,350	1,269,071	672,681
Cash and cash equivalents at end of year	205,189	197,350	1,269,071
Cash paid during the period for:
Interest expense	130,180	20,608	20,285
Income taxes paid, net of refund	27,636	62,795	46,097
Noncash investing activities:
Loans transferred to other real estate owned	94	105	181
Acquisitions:
Fair value of assets acquired, excluding acquired cash and goodwill	1,415,712	705	0
Fair value of liabilities assumed	1,380,386	0	0
Common stock issued	$ 161,723	$ 0	$ 0