Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities:
Net income	$ 111,088	$ 94,798
Adjustments to reconcile net income to net cash from operating activities
Depreciation and amortization	4,933	4,989
Net accretion of discounts and premiums	(7,946)	(3,407)
Deferred income taxes	(20,691)	(1,806)
Provision for credit losses	3,146	2,920
Net gain on sale of loans	(6,107)	(6,639)
Net change in trading debt securities	0	666
Net investment securities gains	0	(109)
Originations of mortgage loans held for sale	(295,149)	(248,607)
Proceeds from sales of mortgage loans held for sale	300,271	253,623
Stock-based compensation	1,004	934
Decrease (increase) in other assets	74,646	(31,574)
Increase in other liabilities	44,906	36,657
Net cash provided by operating activities	210,101	102,445
Cash flows from investing activities:
Purchase of AFS securities	(771,964)	(542,910)
Purchase of equity securities	(3)	(54)
Proceeds from sales of equity securities	29	859
Proceeds from maturities of AFS securities	360,645	458,523
Proceeds from maturities of HTM securities	161	5
Net change in interest-bearing deposits	181	50
Net (increase) decrease in loans	(75,228)	124,732
Purchase of land, buildings, and equipment	(8,414)	(1,337)
Proceeds from sale of land, buildings, and equipment	91	552
Net cash (used in) provided by investing activities	(494,502)	40,420
Cash flows from financing activities:
(Decrease) increase in deposits	(379,212)	101,687
(Decrease) in time deposits	(17,972)	(14,798)
Increase in federal funds purchased and customer repurchase agreements	55,072	90,145
Dividends paid	(29,109)	(12,086)
Purchase of treasury stock	(31,143)	0
Net cash (used in) provided by financing activities	(402,364)	164,948
Net (decrease) increase in cash and cash equivalents	(686,765)	307,813
Cash and cash equivalents at beginning of year	2,064,143	1,241,808
Cash and cash equivalents at end of year	1,377,378	1,549,621
Cash and due from banks	190,868	319,668
Short-term interest-bearing deposits	1,185,077	1,227,505
Federal funds sold and securities purchased under agreements to resell	1,433	2,448
Total cash and cash equivalents	1,377,378	1,549,621
Supplemental disclosure of cash flow information:
Interest paid	48,407	50,570
Income taxes paid	1,049	0
Loans transferred to foreclosed assets held for sale	$ 2,090	$ 1,016