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Business Combinations - Fair Value Adjustments Made to the Amortized Cost (Details) - USD ($)
$ in Thousands
Jul. 31, 2020
Apr. 01, 2019
Business Acquisition [Line Items]    
Gross amortized cost basis at July 31, 2020 $ 1,787,057  
Interest component of expected cash flows (accretable difference) 455  
Credit fair value adjustment on non-PCD loans (21,397)  
Allowance for credit losses on PCD loans (13,586)  
Gross amortized cost basis at July 31, 2020   $ 822,400
SB One Bancorp    
Business Acquisition [Line Items]    
Interest component of expected cash flows (accretable difference) (7,988)  
Allowance for credit losses on PCD loans (13,586)  
Gross amortized cost basis at July 31, 2020 $ 315,784