Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period			$ (21,146)
Net comprehensive (loss) income	$ (196,928)	$ 25,167	(469,738)	$ (23,453)
Balance at the end of the period	(490,884)		(490,884)
Benefit Plans
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	57	(151)	57	(151)
Balance at the end of the period	57	(151)	57	(151)
Unrealized Gains and (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(294,013)	(880)	(21,203)	47,740
Other comprehensive income (loss) before reclassifications	(196,928)	25,194	(469,738)	(23,426)
Amounts reclassified from accumulated other comprehensive loss		(27)		(27)
Net comprehensive (loss) income	(196,928)	25,167	(469,738)	(23,453)
Balance at the end of the period	(490,941)	24,287	(490,941)	24,287
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period	(293,956)	(1,031)	(21,146)	47,589
Other comprehensive income (loss) before reclassifications	(196,928)	25,194	(469,738)	(23,426)
Amounts reclassified from accumulated other comprehensive loss		(27)		(27)
Net comprehensive (loss) income	(196,928)	25,167	(469,738)	(23,453)
Balance at the end of the period	$ (490,884)	$ 24,136	$ (490,884)	$ 24,136