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SECURITIES - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Securities available-for-sale:      
Securities available-for-sale transferred to held-to-maturity   $ 175,260,000  
Transfer from securities held-to-maturity $ 0 $ 182,100,000  
Securities held-to-maturity $ 532,572,000   $ 505,759,000
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%
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 4,700,000   $ 5,400,000
Unrealized losses are related to credit losses 0    
Securities pledged      
Securities available-for-sale:      
Carrying amount of securities pledged $ 667,900,000   $ 631,400,000
Financial Instrument, Owned, Pledged Status [Extensible Enumeration] Securities pledged   Securities pledged
Carrying Amount      
Securities available-for-sale:      
Securities held-to-maturity $ 605,642,000   $ 585,798,000
Fair Value      
Securities available-for-sale:      
Securities held-to-maturity 532,572,000   505,759,000
Agency collateralized mortgage obligations ("CMOs")      
Securities available-for-sale:      
Securities held-to-maturity 194,312,000   184,929,000
Agency Notes      
Securities available-for-sale:      
Securities held-to-maturity 77,639,000   75,062,000
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs")      
Securities available-for-sale:      
Securities held-to-maturity 253,684,000   237,321,000
Available for sale debt securities, unrealized loss position due to credit $ 235,074,000   $ 241,240,000