Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net income	$ 151,995	$ 154,885	$ 104,388
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	17,147	(8,257)	51,134
Depreciation and amortization of premises and equipment	10,155	9,896	9,772
Net amortization on securities	3,460	5,832	4,369
Amortization of intangible assets	2,263	2,808	3,395
Amortization of operating lease right-of-use assets	6,643	7,176	7,382
Excess tax benefit on stock-based compensation	(288)	(385)	(181)
Stock-based compensation expense	4,530	4,414	4,581
Bank owned life insurance income	(6,044)	(6,217)	(5,743)
Amortization of subordinated debt issuance costs	437	438	230
Discount on repurchase of subordinated debt	(106)	0	0
Proceeds from sale of loans held for sale	5,674	55,065	168,707
Originations of loans held for sale	(5,475)	(54,608)	(158,279)
Net gains on sale of loans held for sale	(122)	(361)	(1,989)
Net security losses (gains)	1,131	(566)	388
Net (gains) losses on sale of other real estate owned	(259)	182	(96)
Lease termination losses	0	0	4,284
Net change in other assets and other liabilities	(7,918)	(11,117)	(47,069)
Net cash provided by operating activities	183,223	159,185	145,273
Investing activities
Net cash used in acquisitions	(2,616)	(1,550)	(6,760)
Securities available for sale:
Proceeds from maturities, calls and principal paydowns	213,722	395,386	336,410
Purchases	(264,569)	(775,963)	(689,932)
Securities held to maturity:
Proceeds from maturities, calls and principal paydowns	177,554	181,620	243,136
Proceeds from sales	0	0	996
Purchases	(365,033)	(299,014)	(230,951)
Equity securities:
Proceeds from calls	0	1,000	2,000
Purchases	(1,000)	0	0
Other:
Net increase in loans	(659,949)	(9,305)	(378,765)
Proceeds from Federal Home Loan Bank stock redemption	36,125	2,422	63,305
Purchases of Federal Reserve Bank and Federal Home Loan Bank stock	(55,740)	(167)	(46,038)
Proceeds from settlement of bank owned life insurance	1,873	4,413	1,057
Purchases of bank owned life insurance	0	(40,000)	0
Purchases of premises and equipment, net	(7,009)	(7,740)	(8,157)
Proceeds from sales of other real estate owned	426	1,290	1,113
Net cash provided by (used in) investing activities	(926,216)	(547,608)	(712,586)
Financing activities
Net (decrease) increase in deposits	(738,536)	1,152,777	1,493,872
Net increase (decrease) in short-term borrowings	487,217	(70,592)	(486,889)
Proceeds from issuance of subordinated debt	0	0	100,000
Payment of subordinated debt issuance costs	0	0	(2,178)
Repurchase of subordinated debt	(2,000)	0	0
Proceeds from issuance of long-term debt	1,519	0	0
Repayments of long-term debt	(10,699)	(25,101)	(25,114)
Proceeds from the issuance of shares to employee and other stock plans	0	112	184
Cash paid by employer for tax-withholding on stock issuance	(1,751)	(2,931)	(1,537)
Purchase of treasury stock	(14,713)	(21,714)	(7,980)
Cash dividends	(49,765)	(47,738)	(47,207)
Net cash (used in) provided by financing activities	(328,728)	984,813	1,023,151
Net (decrease) increase in cash and cash equivalents	(1,071,721)	596,390	455,838
Cash and cash equivalents at beginning of year	1,269,071	672,681	216,843
Cash and cash equivalents at end of year	197,350	1,269,071	672,681
Cash paid during the period for:
Interest expense	20,608	20,285	31,692
Income taxes paid, net of refund	62,795	46,097	45,790
Noncash investing activities:
Loans transferred to other real estate owned	105	181	1,017
Acquisitions:
Fair value of assets acquired	$ 705	$ 0	$ 3,328