Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Deferred income tax expense (benefit), related to unrealized gain (losses) on available-for-sale securities	$ 53,400	$ 8,000	$ (5,600)
Reclassification adjustment of actuarial net (loss) gain included in net income	749	1,100	900
Deferred tax expense	12,769	17,709	9,738
Deferred tax assets	36,899
Included in retained earnings, no provision for income tax	21,500	21,500
Valuation allowance	1,965	1,965
Operating loss carryforwards	147,000	116,100
Accounting Standards Update 2016-13 | Impact of adopting ASU 2016-13 (CECL) effective January 1, 2022
Income Tax Contingency [Line Items]
Deferred tax assets	2,400
RSI, Freehold, Roselle, And Stewardship Acquisitions
Income Tax Contingency [Line Items]
Deferred tax expense	9,600	1,500	$ 5,400
Roselle Entities
Income Tax Contingency [Line Items]
Operating loss carryforwards	7,800	9,900
RSI Entities
Income Tax Contingency [Line Items]
Operating loss carryforwards	8,600
New Jersey Division of Taxation
Income Tax Contingency [Line Items]
Tax credit carryforward, amount	$ 2,200	$ 2,200