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INVESTMENT SECURITIES (Schedule of amortized cost and fair value of securities available-for-sale) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Investment securities available for sale, at fair value $ 603,168 $ 266,096
Available-for-sale Securities.    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 607,017 262,749
Gross Unrealized/Unrecognized Gains 1,372 3,596
Gross Unrealized/Unrecognized Losses (5,221) (249)
Investment securities available for sale, at fair value 603,168 266,096
Available-for-sale Securities. | Residential mortgage securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 504,167 192,163
Gross Unrealized/Unrecognized Gains 1,123 2,599
Gross Unrealized/Unrecognized Losses (3,859) (74)
Investment securities available for sale, at fair value 501,431 194,688
Available-for-sale Securities. | Commercial mortgage securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 18,270 32,589
Gross Unrealized/Unrecognized Gains 249 997
Gross Unrealized/Unrecognized Losses (263) (94)
Investment securities available for sale, at fair value 18,256 33,492
Available-for-sale Securities. | Asset-backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,750  
Gross Unrealized/Unrecognized Gains 0  
Gross Unrealized/Unrecognized Losses (17)  
Investment securities available for sale, at fair value 4,733  
Available-for-sale Securities. | U.S. Government agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 67,994 37,997
Gross Unrealized/Unrecognized Gains 0 0
Gross Unrealized/Unrecognized Losses (763) (81)
Investment securities available for sale, at fair value 67,231 $ 37,916
Available-for-sale Securities. | Securities issued by states and political subdivisions in the U.S    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 11,836  
Gross Unrealized/Unrecognized Gains 0  
Gross Unrealized/Unrecognized Losses (319)  
Investment securities available for sale, at fair value $ 11,517