Parent Company Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest and Dividend Income, Operating	$ 471,670	$ 378,247	$ 345,853
Interest Expense	98,557	31,188	15,960
Income taxes	26,870	32,108	34,290
Net Income (Loss) Attributable to Parent	126,734	148,351	153,945
Other Comprehensive Income (Loss), Net of Tax	36,203	(117,549)	9,584
Parent Company
Dividends From Subsidiaries	110,000	120,000	115,500
Interest and Dividend Income, Operating	1,678	1,250	1,250
Other Income	163	2,478	2,016
Revenues	111,841	123,728	118,766
Interest Expense	9,383	8,833	8,887
Other Expenses	9,536	10,504	10,707
Operating Expenses	18,919	19,337	19,594
Income Before Taxes And Equity In Undistributed Losses Of Subsidiaries	92,922	104,391	99,172
Income taxes	(4,196)	(5,142)	(4,897)
Income Before Equity In Undistributed Losses Of Subsidiaries	97,118	109,533	104,069
Equity In Undistributed Losses Of Subsidiaries	(29,616)	(38,818)	(49,876)
Net Income (Loss) Attributable to Parent	126,734	148,351	153,945
Other Comprehensive Income (Loss), Net of Tax	36,203	(117,549)	9,584
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 162,937	$ 30,802	$ 163,529