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Subordinated Debentures (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2020
Jun. 28, 2007
Debt Instrument [Line Items]          
Basis spread on variable rate 350.00%        
Interest rate 5.75%        
Subordinated debentures $ 25,135 $ 0      
Interest expense on subordinated debentures 512 $ 0 $ 0    
SB One Bancorp          
Debt Instrument [Line Items]          
Subordinated debentures $ 27,500        
SB One Bancorp | Unsecured Debt          
Debt Instrument [Line Items]          
Interest rate 1.66%        
SB One Bancorp | Unsecured Debt | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate         144.00%
SB One Bancorp | Subordinated Debt          
Debt Instrument [Line Items]          
Outstanding balance       $ 27,900  
Net fair value         $ 25,100
SB One Bancorp | Variable Rate Capital Trust Pass-Through Securities | Unsecured Debt          
Debt Instrument [Line Items]          
Outstanding balance         12,500
SB One Bancorp | Fixed-To-Floating Rate Subordinated Notes | Unsecured Debt          
Debt Instrument [Line Items]          
Outstanding balance         15,000
SB One Bancorp | Variable Rate Subordinated Deferrable Interest Debentures | Unsecured Debt          
Debt Instrument [Line Items]          
Outstanding balance         12,900
Variable rate subordinated deferrable interest debentures         12,900
SB One Bancorp | Common Securities In Consideration For Payment | Unsecured Debt          
Debt Instrument [Line Items]          
Outstanding balance         $ 387