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INVESTMENT SECURITIES - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
security
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Gain on investments $ 11   $ 156    
Loss adjustment on equity securities       $ (31)  
Gain adjustment on equity securities   $ 9      
Number of investment securities | security     14    
Investment securities 450,402   $ 450,402   $ 466,465
Proceeds from sale of investment securities 0 $ 0 75,719 0  
Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Investment securities 75,600   75,600    
Proceeds from sale of investment securities     75,700 $ 0  
Collateral Pledged          
Debt Securities, Available-for-sale [Line Items]          
Investment securities pledged to secure public funds, fair value $ 312,300   $ 312,300   $ 398,700