Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Cash flows from operating activities:
Net income	$ 390,853	$ 305,810
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	20,008	19,204
Net (accretion) amortization of discounts and premiums	(20,705)	7,640
Deferred income taxes	(3,441)	(6,660)
Provision for credit losses	9,311	14,587
Net gain on sale of loans	(29,742)	(28,964)
Net change in trading debt securities	666	(670)
Net investment securities losses	6,811	36,661
Originations of mortgage loans held for sale	(1,278,712)	(1,278,005)
Proceeds from sales of mortgage loans held for sale	1,302,110	1,302,861
Stock-based compensation	3,117	3,458
(Increase) decrease in other assets	(112,820)	8,312
(Decrease) in other liabilities	(39,292)	(20,937)
Net cash provided by operating activities	248,164	363,297
Cash flows from investing activities:
Purchase of available-for-sale securities	(2,566,281)	(3,761,831)
Purchase of equity securities	(234)	(10,590)
Proceeds from sales of available-for-sale securities	315,180	1,044,686
Proceeds from sales of equity securities	913	26,654
Proceeds from maturities of available-for-sale securities	1,639,896	2,227,755
Proceeds from maturities of held-to-maturity securities	1,548	836
Net change in interest-bearing deposits	(340)	489
Net decrease (increase) in loans	161,913	(148,660)
Purchase of land, buildings, and equipment	(16,771)	(25,158)
Proceeds from sale of land, buildings, and equipment	433	11,911
Net cash (used in) investing activities	(463,743)	(633,908)
Cash flows from financing activities:
Increase (decrease) in deposits	938,598	(53,155)
(Decrease) increase in time deposits	(61,821)	169,493
Increase (decrease) in federal funds purchased and customer repurchase agreements	4,556	(218,872)
Dividends paid	246,531	57,532
Purchase of treasury stock	0	(12,143)
Proceeds from stock issuance, net	403,112	0
Net cash provided by (used in) financing activities	1,037,914	(172,209)
Net increase (decrease) in cash and cash equivalents	822,335	(442,820)
Cash and cash equivalents at beginning of year	1,241,808	1,684,628
Cash and cash equivalents at end of year	2,064,143	1,241,808
Cash and due from banks	258,588	265,209
Short-term earning assets	1,805,215	969,416
Federal funds sold and securities purchased under agreements to resell	340	7,183
Total cash and cash equivalents	2,064,143	1,241,808
Supplemental disclosure of cash flow information:
Interest paid	199,298	216,063
Income taxes paid	144,380	92,020
Loans transferred to foreclosed assets held for sale	$ 4,442	$ 4,938