Acquisitions - Narrative (Details)				3 Months Ended		12 Months Ended
	Dec. 01, 2021 USD ($) shares	Apr. 01, 2020 USD ($) shares	Nov. 01, 2019 USD ($) branch $ / shares	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) branch	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) branch	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Assets					$ 8,798,536,000	$ 9,224,097,000	$ 8,798,536,000
Liabilities					7,787,249,000	8,145,016,000	7,787,249,000
Deposits					6,778,624,000	7,570,216,000	6,778,624,000
Balance					799,364,000	377,309,000	799,364,000
Merger-related expenses						822,000	1,931,000	$ 2,755,000
Goodwill					$ 80,285,000	85,324,000	$ 80,285,000
Facility Closing
Business Acquisition [Line Items]
Number of branches closed | branch					4		4
Gain (loss) on restructuring						301,000	$ 770,000
Stewardship Financial Corporation
Business Acquisition [Line Items]
Business acquisition, share price (in dollars per share) | $ / shares			$ 15.75
Cash paid for purchase			$ 136,294,000
Merger-related expenses						277,000	1,300,000	2,800,000
Goodwill			55,047,000
Roselle Entities
Business Acquisition [Line Items]
Merger-related expenses						0	597,000	0
Goodwill		$ 23,809,000				17,600,000
Business, acquisition, equity interest issued or issuable (in shares) | shares		4,759,048
Business combination, provisional information, initial accounting incomplete, adjustment, deferred tax assets					$ 5,100,000
Goodwill, decrease from subsequent recognition of deferred tax asset				$ 1,100,000
Freehold Entities
Business Acquisition [Line Items]
Merger-related expenses						350,000	0	0
Goodwill	$ 6,104,000
Business, acquisition, equity interest issued or issuable (in shares) | shares	2,591,007
RSI Entites
Business Acquisition [Line Items]
Merger-related expenses						$ 196,000	$ 0	$ 0
Stewardship Financial Corporation
Business Acquisition [Line Items]
Assets			956,000,000
Loans receivable, net			756,900,000
Securities			52,600,000
Liabilities			877,800,000
Deposits			781,400,000
Balance			$ 81,800,000
Number of stores | branch			12
Core deposit intangibles | Stewardship Financial Corporation
Business Acquisition [Line Items]
Core deposit intangible			$ 7,500,000