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Business Combinations - SB One Bancorp Acquisition (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 31, 2020
USD ($)
numberOfBankingOffices
shares
Apr. 01, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]                    
Fair value of acquired loans at July 31, 2020     $ 822,400 $ 822,400            
Fair value premium       10,600            
Allowance for credit losses     106,314 106,314 $ 86,259 $ 55,525 $ 55,525 $ 57,344 $ 62,810 $ 55,562
Subordinated debentures     25,099 25,099     $ 0      
SB One Bancorp                    
Business Acquisition [Line Items]                    
Fair value of acquired loans 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                  
Fair value premium       133            
Allowance for credit losses     13,600 13,600            
Bank-owned life insurance 37,200                  
Time deposit discount       4,300            
Subordinated debentures     27,500 27,500            
Merger-related expenses     $ 2,000 3,100            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Other Than Goodwill 2,195,708                  
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]                    
Fair value of acquired loans at July 31, 2020 1,770,000                  
SB One Bancorp | Deposits                    
Business Acquisition [Line Items]                    
Fair value of acquired loans at July 31, 2020 $ 1,760,000                  
Tirschwell & Loewy                    
Business Acquisition [Line Items]                    
Total cost of acquisition   $ 21,600