Income Tax - Reconciliation of Federal Statutory to Actual Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Federal Statutory to Actual Tax Expense:
Federal Statutory Income Tax at 21%	$ 53,692	$ 50,566	$ 35,695
Tax-exempt Interest Income	(19,349)	(16,200)	(13,273)
Stock Compensation	(214)	(20)	338
Earnings on Life Insurance	(2,344)	(1,468)	(1,079)
Tax Credits	(414)	(354)	(425)
CARES Act - NOL carryback rate differential	0	0	(1,178)
State Tax	2,494	2,697	1,122
Other	(280)	38	175
Income Tax Expense	$ 33,585	$ 35,259	$ 21,375
Effective Tax Rate	13.10%	14.60%	12.60%