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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Investment Holdings [Line Items]      
Less than 12 months, Fair Value $ 1,036,979   $ 126,530
Less than 12 months, Unrealized Losses (17,990)   (1,165)
12 months or longer, Fair Value 175,681   20,925
12 months or longer, Unrealized Losses (6,743)   (262)
Total, Fair Value 1,212,660   147,455
Total, Unrealized Losses (24,733)   (1,427)
Common Stock, Value, Issued 426,091   442,635
States and political subdivisions      
Investment Holdings [Line Items]      
Less than 12 months, Fair Value 79,360   21,313
Less than 12 months, Unrealized Losses (1,252)   (177)
12 months or longer, Fair Value 10,864   0
12 months or longer, Unrealized Losses (597)   0
Total, Fair Value 90,224   21,313
Total, Unrealized Losses (1,849)   (177)
Corporate securities      
Investment Holdings [Line Items]      
Less than 12 months, Fair Value 8,633    
Less than 12 months, Unrealized Losses (235)    
12 months or longer, Fair Value 21,960    
12 months or longer, Unrealized Losses (830)    
Total, Fair Value 30,593    
Total, Unrealized Losses (1,065)    
U.S. Treasury obligations and direct obligations of U.S Government agencies      
Investment Holdings [Line Items]      
Less than 12 months, Fair Value 16,103   5,980
Less than 12 months, Unrealized Losses (415)   (24)
12 months or longer, Fair Value 10,891   20,925
12 months or longer, Unrealized Losses (153)   (262)
Total, Fair Value 26,994   26,905
Total, Unrealized Losses (568)   (286)
Residential - U.S. Government-sponsored entities ("GSEs")      
Investment Holdings [Line Items]      
Less than 12 months, Fair Value 926,570   76,402
Less than 12 months, Unrealized Losses (15,883)   (299)
12 months or longer, Fair Value 114,747   0
12 months or longer, Unrealized Losses (4,110)   0
Total, Fair Value 1,041,317   76,402
Total, Unrealized Losses (19,993)   (299)
Residential - Non-government sponsored entities      
Investment Holdings [Line Items]      
Less than 12 months, Fair Value 0   989
Less than 12 months, Unrealized Losses 0   (34)
12 months or longer, Fair Value 938   0
12 months or longer, Unrealized Losses (64)   0
Total, Fair Value 938   989
Total, Unrealized Losses (64)   (34)
Commercial - Non-GSEs      
Investment Holdings [Line Items]      
Less than 12 months, Fair Value 6,313   16,977
Less than 12 months, Unrealized Losses (205)   (500)
12 months or longer, Fair Value 16,281   0
12 months or longer, Unrealized Losses (989)   0
Total, Fair Value 22,594   16,977
Total, Unrealized Losses $ (1,194)   $ (500)
Common Class B | Visa      
Investment Holdings [Line Items]      
Investment Owned, Balance, Shares 34,631    
Common Class A | Visa      
Investment Holdings [Line Items]      
Common Stock, Value, Issued   $ 2,600  
Investment Owned, Balance, Shares   11,170