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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Nov. 02, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Dividends declared (in dollars per share)		$ 0.52	$ 0.51	$ 1.56	$ 1.53
Schedule of Accumulated Other Income (Loss) [Abstract]
Balance, Beginning of Period				$ 335,868	$ 104,923
Net change in unrealized gain (loss)		$ (74,525)	$ (6,783)	(216,176)	347,985
Reclassification Adjustments Included in Earnings [Abstract]
Loss (gain) on available for sale securities, net		(1,255)	12	(3,152)	(5,571)
Other comprehensive income, before income taxes		(75,780)	(6,771)	(219,328)	342,414
Federal and state income taxes		(18,184)	(1,625)	(52,632)	82,167
Other comprehensive income, net of income taxes		(57,596)	(5,146)	(166,696)	260,247
Balance, End of Period		169,172	365,170	169,172	365,170
Accumulated Net Unrealized Gain (Loss) on Available for Sale Securities [Member]
Schedule of Accumulated Other Income (Loss) [Abstract]
Balance, Beginning of Period				335,032	104,996
Net change in unrealized gain (loss)				(216,176)	347,985
Reclassification Adjustments Included in Earnings [Abstract]
Loss (gain) on available for sale securities, net				(3,152)	(5,571)
Other comprehensive income, before income taxes				(219,328)	342,414
Federal and state income taxes				(52,632)	82,167
Other comprehensive income, net of income taxes				(166,696)	260,247
Balance, End of Period		168,336	365,243	168,336	365,243
Accumulated Unrealized Gain (Loss) on Employee Benefit Plans [Member]
Schedule of Accumulated Other Income (Loss) [Abstract]
Balance, Beginning of Period				836	(73)
Net change in unrealized gain (loss)				0	0
Reclassification Adjustments Included in Earnings [Abstract]
Loss (gain) on available for sale securities, net				0	0
Other comprehensive income, before income taxes				0	0
Federal and state income taxes				0	0
Other comprehensive income, net of income taxes				0	0
Balance, End of Period		$ 836	$ (73)	$ 836	$ (73)
Subsequent Event [Member]
Dividends Payable, Date Declared	Nov. 02, 2021
Dividends declared (in dollars per share)	$ 0.53
Dividends Payable, Date to be Paid	Nov. 24, 2021
Dividends Payable, Date of Record	Nov. 15, 2021

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