Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Computed at the statutory rate	$ 69,807	$ 67,143	$ 63,442
State income taxes, net of federal tax benefit	4,452	6,402	5,860
Discrete items related to share-based compensation	(17)	375	(38)
Tax exempt interest income	(11,510)	(6,726)	(4,390)
Tax exempt earnings on bank owned life insurance	(1,212)	(1,214)	(852)
Federal tax credits	(2,260)	(2,177)	(939)
Other differences, net	2,046	1,087	1,182
Provision for income taxes	$ 61,306	$ 64,890	$ 64,265