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INVESTMENT SECURITIES - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
security
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
security
Dec. 31, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]          
(Losses) gain on investments $ (14) $ 479 $ 8 $ 635  
Number of investments securities, partially sold | security     1    
Investment securities 503,596   $ 503,596   $ 472,438
Proceeds from sale of investment securities $ 0 $ 73,319 3,075 $ 149,038  
Number of investment securities sold | security 0 4   18  
Collateral Pledged          
Debt Securities, Available-for-sale [Line Items]          
Investment securities pledged to secure public funds, fair value $ 404,100   404,100   295,600
Non-agency CMOs          
Debt Securities, Available-for-sale [Line Items]          
(Losses) gain on investments     (171)    
Investment securities 28,972   28,972   29,698
Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Investment securities 3,100 $ 148,400 3,100 $ 148,400  
Proceeds from sale of investment securities     3,100 149,038  
Asset-backed          
Debt Securities, Available-for-sale [Line Items]          
Investment securities $ 113,735 72,800 $ 113,735 $ 72,800 $ 122,621
Proceeds from sale of investment securities   $ 73,300