Parent Company Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest and Dividend Income, Operating	$ 345,853	$ 357,720	$ 360,500
Interest Expense	15,960	30,090	62,763
Income taxes	34,290	26,722	22,071
Net Income (Loss) Attributable to Parent	153,945	127,923	102,700
Other Comprehensive Income (Loss), Net of Tax	9,584	15,160	40,199
Parent Company
Dividends From Subsidiaries	115,500	97,000	97,500
Interest and Dividend Income, Operating	1,250	1,250	1,250
Other Income	2,016	98	4,634
Revenues	118,766	98,348	103,384
Interest Expense	8,887	4,311	1,950
Other Expenses	10,707	12,234	19,804
Operating Expenses	19,594	16,545	21,754
Income Before Taxes And Equity In Undistributed Losses Of Subsidiaries	99,172	81,803	81,630
Income taxes	(4,897)	(4,390)	(4,242)
Income Before Equity In Undistributed Losses Of Subsidiaries	104,069	86,193	85,872
Equity In Undistributed Losses Of Subsidiaries	(49,876)	(41,730)	(16,828)
Net Income (Loss) Attributable to Parent	153,945	127,923	102,700
Other Comprehensive Income (Loss), Net of Tax	9,584	15,160	40,199
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 163,529	$ 143,083	$ 142,899