Parent Company Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest and Dividend Income, Operating	$ 378,247	$ 345,853	$ 357,720
Interest Expense	31,188	15,960	30,090
Income taxes	32,108	34,290	26,722
Net Income (Loss) Attributable to Parent	148,351	153,945	127,923
Other Comprehensive Income (Loss), Net of Tax	(117,549)	9,584	15,160
Parent Company
Dividends From Subsidiaries	120,000	115,500	97,000
Interest and Dividend Income, Operating	1,250	1,250	1,250
Other Income	2,478	2,016	98
Revenues	123,728	118,766	98,348
Interest Expense	8,833	8,887	4,311
Other Expenses	10,504	10,707	12,234
Operating Expenses	19,337	19,594	16,545
Income Before Taxes And Equity In Undistributed Losses Of Subsidiaries	104,391	99,172	81,803
Income taxes	(5,142)	(4,897)	(4,390)
Income Before Equity In Undistributed Losses Of Subsidiaries	109,533	104,069	86,193
Equity In Undistributed Losses Of Subsidiaries	(38,818)	(49,876)	(41,730)
Net Income (Loss) Attributable to Parent	148,351	153,945	127,923
Other Comprehensive Income (Loss), Net of Tax	(117,549)	9,584	15,160
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 30,802	$ 163,529	$ 143,083