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INVESTMENT SECURITIES (Schedule of Unrealized Loss on Investments, AFS) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value    
Less than 12 months, fair value $ 293,211 $ 289,705
More than 12 months, fair value 173,583 52,305
Fair value 466,794 342,010
Unrealized Losses    
Less than 12 months, unrealized loss 18,309 5,136
More than 12 months, unrealized loss 7,769 893
Unrealized loss 26,078 6,029
Asset-backed securities issued by GSEs and U.S. Agencies    
Fair Value    
Less than 12 months, fair value 190,094 205,891
More than 12 months, fair value 106,161 41,327
Fair value 296,255 247,218
Unrealized Losses    
Less than 12 months, unrealized loss 10,820 3,997
More than 12 months, unrealized loss 4,572 776
Unrealized loss 15,392 4,773
Asset-backed securities issued by Others    
Fair Value    
Less than 12 months, fair value 0 0
More than 12 months, fair value 44 57
Fair value 44 57
Unrealized Losses    
Less than 12 months, unrealized loss 0 0
More than 12 months, unrealized loss 3 4
Unrealized loss 3 4
Student Loan Trust ABSs    
Fair Value    
Less than 12 months, fair value 17,882 21,640
More than 12 months, fair value 24,890 2,226
Fair value 42,772 23,866
Unrealized Losses    
Less than 12 months, unrealized loss 716 281
More than 12 months, unrealized loss 387 5
Unrealized loss 1,103 286
Municipal bonds    
Fair Value    
Less than 12 months, fair value 56,379 47,314
More than 12 months, fair value 33,041 6,696
Fair value 89,420 54,010
Unrealized Losses    
Less than 12 months, unrealized loss 5,774 776
More than 12 months, unrealized loss 2,304 108
Unrealized loss 8,078 884
Corporate bonds    
Fair Value    
Less than 12 months, fair value 2,960  
More than 12 months, fair value 0  
Fair value 2,960  
Unrealized Losses    
Less than 12 months, unrealized loss 40  
More than 12 months, unrealized loss 0  
Unrealized loss 40  
U.S. government obligations    
Fair Value    
Less than 12 months, fair value 25,896 14,860
More than 12 months, fair value 9,447 1,999
Fair value 35,343 16,859
Unrealized Losses    
Less than 12 months, unrealized loss 959 82
More than 12 months, unrealized loss 503 0
Unrealized loss $ 1,462 $ 82