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JUNIOR SUBORDINATED DEBT AND SENIOR SUBORDINATED NOTES (Narrative) (Details)
$ in Thousands
12 Months Ended
Aug. 25, 2020
USD ($)
Jan. 20, 2017
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Jun. 23, 2017
USD ($)
Apr. 22, 2015
USD ($)
Sep. 17, 2003
USD ($)
Debt Instrument [Line Items]                
Proceeds from issuance of subordinated long-term debt     $ 0 $ 58,600        
Junior subordinated notes     9,781   $ 9,731      
Senior subordinated notes - long term     $ 85,531   $ 85,297      
Eastern Virginia Bankshares Inc [Member]                
Debt Instrument [Line Items]                
Notes assumed in merger           $ 10,300    
Trust preferred securities pooled underwriting amount               $ 650,000
Junior Subordinated Debt [Member]                
Debt Instrument [Line Items]                
Description of variable rate basis     three-month LIBOR          
Unamortized debt issuance costs     $ 600          
Junior subordinated notes     $ 10,300          
Junior Subordinated Debt [Member] | Eastern Virginia Bankshares Inc [Member]                
Debt Instrument [Line Items]                
Interest rate percentage     7.69%   3.17%      
Basis spread on LIBOR     2.95%          
Percentage of tier one capital for regulatory capital adequacy     25.00%          
Senior Subordinated Notes [Member] | Eastern Virginia Bankshares Inc [Member]                
Debt Instrument [Line Items]                
Interest rate percentage             6.50%  
Debt instrument, face amount             $ 20,000  
SNBV Senior Subordinated Notes [Member] | Senior Subordinated Notes [Member]                
Debt Instrument [Line Items]                
Interest rate percentage   5.875%            
Description of variable rate basis   three-month LIBOR            
Basis spread on LIBOR   3.95%            
Percentage of subordinated notes considered tier 2     80.00%          
Debt instrument, face amount   $ 27,000            
SNBV Subordinated Notes [Member] | Subordinated Debt [Member]                
Debt Instrument [Line Items]                
Unamortized debt issuance costs     $ 1,500   $ 1,700      
Percentage of subordinated notes considered tier 2     100.00%          
Debt instrument, face amount $ 60,000              
SNBV Subordinated Notes [Member] | Senior Subordinated Notes [Member]                
Debt Instrument [Line Items]                
Interest rate percentage 5.40%              
Debt instrument basis points spread 5.31