Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Contingency [Line Items]
Deferred income tax expense (benefit), related to unrealized gain (losses) on available-for-sale securities	$ 8,000	$ (5,600)	$ (5,500)
Reclassification adjustment of actuarial net (loss) gain included in net income	1,100	900	779
Deferred tax expense	17,709	9,738	7,527
Included in retained earnings, no provision for income tax	21,500	21,500
Valuation allowance	1,965	2,002
Operating loss carryforwards	116,100	108,400
Freehold, Roselle, And Stewardship Acquisitions
Income Tax Contingency [Line Items]
Deferred tax expense	1,500	5,400	$ 2,300
Roselle Entities
Income Tax Contingency [Line Items]
Operating loss carryforwards	9,900	11,900
New Jersey Division of Taxation
Income Tax Contingency [Line Items]
Tax credit carryforward, amount	$ 2,200	$ 2,200