Business Combinations (Details) $ in Thousands			3 Months Ended		6 Months Ended
	Jul. 31, 2020 USD ($) numberOfBankingOffices shares	Apr. 01, 2019 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)
Business Acquisition [Line Items]
Assets under management at time of acquisition			$ 822,400		$ 822,400
SB One Bancorp
Business Acquisition [Line Items]
Noncash Merger Related Costs			683		1,100
SB One Bancorp | Subsequent Event
Business Acquisition [Line Items]
Assets under management at time of acquisition	$ 2,220,000
Number of banking offices | numberOfBankingOffices	18
Common stock portion, number of SB One Bancorp stock for each share of company common stock converted | shares	1.357
Common stock, total amount of company stock | shares	12,800,000
Total cost of acquisition	$ 180,800
SB One Bancorp | Loans | Subsequent Event
Business Acquisition [Line Items]
Assets under management at time of acquisition	1,780,000
SB One Bancorp | Deposits | Subsequent Event
Business Acquisition [Line Items]
Assets under management at time of acquisition	$ 1,750,000
Tirschwell & Loewy
Business Acquisition [Line Items]
Increase in estimated fair value of contingent consideration liability				$ 2,800
Goodwill recorded as result of acquisition		$ 8,200
Contingent consideration liability		$ 6,600	9,400		9,400
Additional cash consideration to former stakeholders		3 years
Contingent consideration limit		$ 11,000	$ 11,000		$ 11,000
Total cost of acquisition		21,600
Cash consideration		15,000
Tirschwell & Loewy | Customer Relationships
Business Acquisition [Line Items]
Identifiable intangible assets acquired		12,600
Tirschwell & Loewy | Other Intangible Assets
Business Acquisition [Line Items]
Identifiable intangible assets acquired		$ 800