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INVESTMENT SECURITIES - Investment Securities in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months 857 240
12 months or longer 104 66
Total 961 306
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 3,863,886 $ 1,395,578
12 months or longer 1,002,000 967,788
Total 4,865,886 2,363,366
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 209,135 17,505
12 months or longer 205,282 93,774
Total 414,417 $ 111,279
Available-for-sale, allowance for credit losses 0  
Accrued interest and fees receivable 18,100  
Available-for-sale Securities [Member]    
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Accrued interest and fees receivable $ 17,200  
U.S. Treasury and Agency Securities    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months 94 47
12 months or longer 18 13
Total 112 60
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 3,308,837 $ 1,224,101
12 months or longer 894,753 900,462
Total 4,203,590 2,124,563
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 179,251 14,873
12 months or longer 193,894 91,184
Total $ 373,145 $ 106,057
Obligations of State and Political Subdivisions    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months 292 27
12 months or longer 0 0
Total 292 27
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 244,080 $ 23,966
12 months or longer 0 0
Total 244,080 23,966
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 16,724 56
12 months or longer 0 0
Total $ 16,724 $ 56
Government Agency Mortgage-Backed Securities    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months 431 147
12 months or longer 85 52
Total 516 199
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 289,183 $ 139,442
12 months or longer 107,216 67,273
Total 396,399 206,715
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 12,368 2,475
12 months or longer 11,388 2,590
Total $ 23,756 $ 5,065
Corporate debt securities    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months 2 1
12 months or longer 0 0
Total 2 1
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 7,497 $ 4,923
12 months or longer 0 0
Total 7,497 4,923
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 503 77
12 months or longer 0 0
Total $ 503 $ 77
Government Agency Collateralized Mortgage Obligations    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months 38 18
12 months or longer 1 1
Total 39 19
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 14,289 $ 3,146
12 months or longer 31 53
Total 14,320 3,199
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 289 24
12 months or longer 0 0
Total $ 289 $ 24