Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Computed at the statutory rate	$ 11,862	$ 20,488	$ 38,045	$ 44,412
State income taxes, net of federal tax benefit	(40)	1,774	657	2,339
Stock-based compensation	28	16	469	(89)
Tax exempt interest income	(3,848)	(3,682)	(11,523)	(10,704)
Tax exempt earnings on BOLI	(636)	(509)	(1,973)	(1,399)
Federal tax credits	(567)	(301)	(1,501)	(1,838)
Other differences, net	2,444	(827)	5,845	5,615
Actual tax provision	$ 9,243	$ 16,959	$ 30,019	$ 38,336