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INVESTMENT SECURITIES - Investment Securities in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
position
Dec. 31, 2020
USD ($)
position
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | position 240 117
12 months or longer | position 66 3
Total | position 306 120
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 1,395,578 $ 913,612
12 months or longer 967,788 14
Total 2,363,366 913,626
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 17,505 16,788
12 months or longer 93,774 0
Total 111,279 16,788
Available-for-sale, allowance for credit losses $ 0 $ 0
U.S. Treasury and Agency Securities    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months 47 13
12 months or longer | position 13 0
Total | position 60 13
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months   $ 831,015
12 months or longer $ 900,462 0
Total 2,124,563 831,015
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 14,873 16,595
12 months or longer 91,184 0
Total $ 106,057 $ 16,595
Obligations of State and Political Subdivisions    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months 27 1
12 months or longer | position 0 0
Total | position 27 1
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months   $ 358
12 months or longer $ 0 0
Total 23,966 358
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 56 0
12 months or longer 0 0
Total $ 56 $ 0
Government Agency Mortgage-Backed Securities    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months 147 89
12 months or longer | position 52 2
Total | position 199 91
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months   $ 75,992
12 months or longer $ 67,273 14
Total 206,715 76,006
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 2,475 182
12 months or longer 2,590 0
Total $ 5,065 $ 182
Corporate debt securities    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months 1 1
12 months or longer | position 0 0
Total | position 1 1
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months   $ 1,001
12 months or longer $ 0 0
Total 4,923 1,001
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 77 1
12 months or longer 0 0
Total $ 77 $ 1
Government Agency Collateralized Mortgage Obligations    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months 18 13
12 months or longer | position 1 1
Total | position 19 14
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months   $ 5,246
12 months or longer $ 53 0
Total 3,199 5,246
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 24 10
12 months or longer 0 0
Total $ 24 $ 10