CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities:
Net income	$ 5,798	$ 47,055
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,304	3,690
Amortization of intangible assets	3,667	3,732
Net amortization (accretion) on securities, loans and borrowings	508	(4,547)
Stock-based compensation	2,272	1,886
Gain on debt extinguishment	(242)	0
Provision for credit losses	3,500	906
Amortization of mortgage servicing rights	233	109
Loss on sales of investment securities	52,329	0
Unrealized gain on equity securities	0	(2)
Income from bank-owned life insurance policies	(587)	(440)
Net gain on sale of assets	(399)	(450)
Change in other assets and liabilities	6,991	(1)
Net cash provided by operating activities	77,374	51,938
Investing activities:
Proceeds from maturities, calls, and paydowns of available-for-sale investment securities	20,543	49,667
Proceeds from maturities, calls, and paydowns of held-to-maturity investment securities	10	0
Proceeds from maturities and redemptions of equity and other investment securities	32,148	460
Proceeds from sales of available-for-sale investment securities	733,789	0
Purchases of available-for-sale investment securities	0	(1,256,723)
Purchases of held-to-maturity investment securities	(3,310)	0
Purchases of equity and other securities	(3,319)	(37)
Net increase in loans	(179,292)	(49,556)
Cash paid for acquisitions, net of cash acquired of $0, and $0, respectively	(2,061)	(2,464)
Proceeds from sales of premises and equipment, net	1,634	368
Purchases of premises and equipment, net	(4,070)	(2,582)
Real estate limited partnership investments	0	(247)
Net cash provided by (used in) investing activities	596,072	(1,261,114)
Financing activities:
Net increase in deposits	98,364	406,499
Net decrease in overnight borrowings	(710,000)	0
Net decrease in securities sold under agreement to repurchase, short-term	(42,045)	(24,189)
Net decrease in other Federal Home Loan Bank borrowings	(2,215)	(24)
Redemption of subordinated notes payable	(3,000)	0
Proceeds from the issuance of common stock	513	485
Purchases of treasury stock	(10,966)	(3,592)
Increase in deferred compensation arrangements	60	63
Cash dividends paid	(23,708)	(23,235)
Withholding taxes paid on share-based compensation	(1,047)	(969)
Net cash (used in) provided by financing activities	(694,044)	355,038
Change in cash and cash equivalents	(20,598)	(854,138)
Cash and cash equivalents at beginning of period	209,896	1,875,064
Cash and cash equivalents at end of period	189,298	1,020,926
Supplemental disclosures of cash flow information:
Cash paid for interest	14,815	2,839
Cash paid for income taxes	1,065	3,344
Supplemental disclosures of noncash financing and investing activities:
Dividends declared and unpaid	23,778	23,234
Transfers from loans to other real estate	18	203
Transfers from premises and equipment, net to other assets	1,443	0
Acquisitions:
Fair value of assets acquired, excluding acquired cash and intangibles	32	0
Fair value of liabilities assumed	$ 9	$ 0