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SECURITIES - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Securities available-for-sale:      
Securities available-for-sale transferred to held-to-maturity $ 372,154,000 $ 140,399,000  
Unrealized loss on transfer of securities to held to maturity (27,700,000)    
Gain or loss recorded at the time of transfer 0    
Transfer from securities held-to-maturity 0 0  
Transfers to or from securities held-to-maturity     $ 0
Securities held-to-maturity $ 505,759,000 $ 177,354,000  
Number of holdings of securities of any one issuer in an amount greater than 10% of stockholders equity 0 0  
Threshold for disclosure percentage 10.00% 10.00%  
Debt Securities, Pledged Status [Extensible Enumeration] Securities pledged Securities pledged  
Available for sale debt securities, unrealized loss position due to credit $ 0    
Allowance for credit losses on available for sale debt securities 0    
Accrued interest receivable on securities 5,400,000 $ 4,400,000  
Securities pledged      
Securities available-for-sale:      
Carrying amount of securities pledged 631,400,000 726,400,000  
Carrying Amount      
Securities available-for-sale:      
Securities held-to-maturity 585,798,000 179,309,000  
Fair Value      
Securities available-for-sale:      
Securities held-to-maturity 505,759,000 177,354,000  
Agency collateralized mortgage obligations ("CMOs")      
Securities available-for-sale:      
Securities held-to-maturity 184,929,000 60,054,000  
Agency Notes      
Securities available-for-sale:      
Securities held-to-maturity 75,062,000    
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs")      
Securities available-for-sale:      
Securities held-to-maturity 237,321,000 117,300,000  
Available for sale debt securities, unrealized loss position due to credit $ 241,240,000 $ 427,382,000