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INVESTMENT SECURITIES - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Gain on investments $ 479   $ 635    
Loss adjustment on equity securities   $ (13)   $ (44)  
Number of investment securities sold | security     18    
Investment securities 445,018   $ 445,018   $ 466,465
Proceeds from sale of investment securities 73,319 $ 0 149,038 0  
Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Investment securities $ 148,400   148,400    
Proceeds from sale of investment securities     149,000 $ 0  
Debt Securities | Asset-backed          
Debt Securities, Available-for-sale [Line Items]          
Number of investment securities sold | security 4        
Investment securities $ 72,800   72,800    
Proceeds from sale of investment securities 73,300        
Collateral Pledged          
Debt Securities, Available-for-sale [Line Items]          
Investment securities pledged to secure public funds, fair value $ 316,000   $ 316,000   $ 398,700