Parent Company Financial Statements - Condensed Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash Flows From Operating Activities
Net income	$ 669,257	$ 539,188	$ 581,992
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	44,943	38,104	38,180
Share-based compensation expense	38,214	32,283	27,910
(Increase) decrease in other assets	33,250	(54,023)	(66,070)
Increase (decrease) in other liabilities	(170,846)	(40,241)	(79,885)
Net cash flows provided by (used in) operating activities	681,472	622,284	516,342
Cash Flows From Investing Activities
Net cash and cash equivalents of acquisitions	135,124	177,791	0
Proceeds from sales of investment securities available-for-sale	2,082,053	300,617	96,506
Proceeds from sales of equity securities	6,004	3,080	24,636
Purchases of equity securities	(7,723)	(7,244)	(28,408)
Purchases of premises and equipment	(44,064)	(30,269)	(38,375)
Net cash flows provided by (used in) investing activities	(1,834,806)	(1,371,968)	(1,818,876)
Cash Flows From Financing Activities
Cash dividends paid	(225,117)	(191,163)	(180,030)
Common stock repurchased	(71,799)	(8,884)	(44,308)
Common stock issued for ESPP	1,089	1,034	1,076
Net cash flows provided by (used in) financing activities	1,751,543	802,594	1,749,180
Net increase (decrease) in cash and cash equivalents	598,209	52,910	446,646
Cash and cash equivalents at beginning of period	1,227,968	1,175,058	728,412
Cash and cash equivalents at end of period	1,826,177	1,227,968	1,175,058
Old National Bancorp
Cash Flows From Operating Activities
Net income	669,257	539,188	581,992
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	10	26	18
Share-based compensation expense	38,214	32,283	27,910
(Increase) decrease in other assets	85,847	12,149	(19,353)
Increase (decrease) in other liabilities	100,166	11,772	(2,561)
Equity in undistributed earnings of affiliates	(462,684)	(199,213)	(481,628)
Net cash flows provided by (used in) operating activities	430,810	396,205	106,378
Cash Flows From Investing Activities
Net cash and cash equivalents of acquisitions	(367,143)	0	0
Proceeds from sales of investment securities available-for-sale	13,000	0	0
Proceeds from sales of equity securities	5,999	0	0
Purchases of equity securities	(7,723)	(7,244)	(17,773)
Purchases of premises and equipment	(321)	(76)	(8)
Net cash flows provided by (used in) investing activities	(356,188)	(7,320)	(17,781)
Cash Flows From Financing Activities
Payments for maturities/redemptions of other borrowings	(30,000)	(174,987)	0
Cash dividends paid	(225,117)	(191,163)	(180,030)
Common stock repurchased	(71,799)	(8,884)	(44,308)
Common stock issued for ESPP	1,089	1,034	1,076
Common stock issued for forward sale agreements	443,236	0	0
Net cash flows provided by (used in) financing activities	117,409	(374,000)	(223,262)
Net increase (decrease) in cash and cash equivalents	192,031	14,885	(134,665)
Cash and cash equivalents at beginning of period	299,179	284,294	418,959
Cash and cash equivalents at end of period	$ 491,210	$ 299,179	$ 284,294

OLD NATIONAL BANCORP /IN/ 10-K