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Business Combinations - Fair Value Adjustments Made to the Amortized Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Jul. 31, 2020
Business Acquisition [Line Items]        
Gross amortized cost basis at July 31, 2020       $ 1,784,945
Interest rate fair value adjustment on all loans       2,567
Credit fair value adjustment on non-PCD loans       (21,397)
Fair value of acquired loans at July 31, 2020 $ 822,400 $ 822,400    
Allowance for credit losses on PCD loans       (13,586)
Loans, net 1,752,529 $ 1,752,529 $ 0  
SB One Bancorp        
Business Acquisition [Line Items]        
Interest rate fair value adjustment on all loans       (7,988)
Fair value of acquired loans at July 31, 2020       315,784
Allowance for credit losses on PCD loans       $ (13,586)
Loans, net $ 294,210