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Business Combinations - SB One Bancorp Acquisition (Details)
$ in Thousands
12 Months Ended
Jul. 31, 2020
USD ($)
numberOfBankingOffices
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]            
Gross amortized cost basis at July 31, 2020       $ 822,400    
Excess of consideration paid recorded as goodwill $ 22,400          
Fair value premium   $ 8,400        
Less allowance for credit losses   101,466 $ 55,525   $ 55,562 $ 60,195
Subordinated debentures   25,135 $ 0      
SB One Bancorp            
Business Acquisition [Line Items]            
Assets added during acquisition 2,195,708          
Gross amortized cost basis at July 31, 2020 $ 315,784          
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          
Merger-related expenses   6,300        
Fair value premium   133        
Less allowance for credit losses   13,600        
Bank-owned life insurance   37,200        
Time deposit discount   4,300        
Subordinated debentures   27,500        
SB One Bancorp | Core Deposits            
Business Acquisition [Line Items]            
Intangible asset   $ 3,200        
Estimated useful life   10 years        
SB One Bancorp | Customer Relationships            
Business Acquisition [Line Items]            
Intangible asset   $ 6,800        
Estimated useful life   13 years        
SB One Bancorp | Loans            
Business Acquisition [Line Items]            
Gross amortized cost basis at July 31, 2020 1,770,000          
SB One Bancorp | PCD Loans            
Business Acquisition [Line Items]            
Gross amortized cost basis at July 31, 2020 294,200          
SB One Bancorp | Deposits            
Business Acquisition [Line Items]            
Gross amortized cost basis at July 31, 2020 $ 1,760,000