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INVESTMENT SECURITIES AVAILABLE FOR SALE - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]                    
Available-for-sale Securities $ 598,300,000     $ 374,600,000       $ 598,300,000 $ 374,600,000  
Other than temporary impairment charges               0 0 $ 0
Investment with fair value classified as equity security 15,117,000     10,836,000       15,117,000 10,836,000  
Securities gains/(losses), net (42,000) $ 125,000 $ 198,000 (45,000) $ 34,000 $ 69,000 $ 59,000 281,000 117,000 (393,000)
CRA Investment Fund [Member]                    
Schedule Of Available For Sale Securities [Line Items]                    
Investment with fair value classified as equity security $ 15,100,000     $ 10,800,000       15,100,000 10,800,000  
Securities gains/(losses), net               $ 281,000 $ 117,000 $ (105,000)