Parent Company Condensed Financial Statements - Schedule of Condensed Cash Flow Statement (Details) - 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:
(Increase) decrease in other assets	(112,820)	8,312
Net cash provided by operating activities	248,164	363,297
Cash flows from investing activities:
Proceeds from maturities of available-for-sale securities	1,639,896	2,227,755
Net cash (used in) investing activities	(463,743)	(633,908)
Cash flows from financing activities:
Purchase of treasury stock	0	(12,143)
Proceeds from stock issuance, net	403,112	0
Dividends paid	(246,531)	(57,532)
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
Parent Company
Cash flows from operating activities:
Net income	390,853	305,810
Adjustments to reconcile net income to net cash provided by operating activities:
Earnings of consolidated subsidiaries, net of dividends	(37,091)	(20,968)
(Increase) decrease in other assets	(1,900)	(17,513)
Net cash provided by operating activities	351,862	267,329
Cash flows from investing activities:
Proceeds from maturities of available-for-sale securities	265	4,662
Decrease (increase) in advances to subsidiaries, net	74,110	(74,587)
Other, net	1,541	(6,226)
Net cash (used in) investing activities	75,916	(76,151)
Cash flows from financing activities:
Purchase of treasury stock	0	(12,143)
Issuance of stock under equity compensation plans	(218)	(285)
Proceeds from stock issuance, net	403,112	0
Dividends paid	(246,531)	(57,532)
Other, net	0	942
Net cash provided by (used in) financing activities	156,363	(69,018)
Net increase (decrease) in cash and cash equivalents	584,141	122,160
Cash and cash equivalents at beginning of year	312,447	190,288
Cash and cash equivalents at end of year	$ 896,588	$ 312,447