Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
(Loss) gain on securities transactions	$ 0	$ 0	$ (10,847)	$ 210
Other non-interest expense, net	302	1,925	861	4,501
Total before tax	11,835	27,960	38,617	86,436
Income tax benefit	(2,705)	(7,041)	(9,100)	(22,154)
Net income	9,130	20,919	29,517	64,282
Accumulated Other Comprehensive Income (Loss) Components
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax	1	(339)	(10,844)	(807)
Income tax benefit	0	95	3,067	226
Net income	1	(244)	(7,777)	(581)
Accumulated Other Comprehensive Income (Loss) Components | Reclassification adjustment for (loss) gain included in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
(Loss) gain on securities transactions			(10,847)	210
Accumulated Other Comprehensive Income (Loss) Components | Reclassification adjustment of actuarial net gain (loss) included in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-interest expense, net	$ 1	$ (339)	$ 3	$ (1,017)