Stockholders' Equity - Accumulated Other Comprehensive (Loss) Income (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 785,328
Realized loss on sale of securities, net of tax	1,606
Other comprehensive income (loss), net of reclassifications and tax	6,610
Ending balance	998,907
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(127,136)
Ending balance	(118,920)
Unrealized (Loss) Gain on Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(129,896)
Realized loss on sale of securities, net of tax	1,606
Other comprehensive income (loss), net of reclassifications and tax	6,835
Ending balance	(121,455)
Unrecognized Net Pension and Postretirement Costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,633)
Realized loss on sale of securities, net of tax	0
Other comprehensive income (loss), net of reclassifications and tax	7
Ending balance	(1,626)
Unrealized Gain (Loss) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	4,393
Realized loss on sale of securities, net of tax	0
Other comprehensive income (loss), net of reclassifications and tax	(232)
Ending balance	$ 4,161