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INVESTMENT SECURITIES - Investment Securities in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
position
Dec. 31, 2019
USD ($)
position
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | position 117  
12 months or longer | position 3  
Total | position 120  
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 913,612  
12 months or longer 14  
Total 913,626  
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 16,788  
12 months or longer 0  
Total 16,788  
Available-for-sale, allowance for credit losses $ 0  
U.S. Treasury and Agency Securities [Member]    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | position 13 12
12 months or longer | position 0 5
Total | position 13 17
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 831,015 $ 592,678
12 months or longer 0 25,998
Total 831,015 618,676
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 16,595 7,970
12 months or longer 0 5
Total $ 16,595 $ 7,975
Obligations of State and Political Subdivisions [Member]    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | position 1 21
12 months or longer | position 0 0
Total | position 1 21
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 358 $ 22,716
12 months or longer 0 0
Total 358 22,716
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 0 26
12 months or longer 0 0
Total $ 0 $ 26
Government Agency Mortgage-Backed Securities [Member]    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | position 89 50
12 months or longer | position 2 52
Total | position 91 102
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 75,992 $ 89,237
12 months or longer 14 52,975
Total 76,006 142,212
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 182 341
12 months or longer 0 766
Total $ 182 $ 1,107
Corporate Debt Securities [Member]    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | position 1 5
12 months or longer | position 0 5
Total | position 1 10
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 1,001 $ 5,971
12 months or longer 0 4,405
Total 1,001 10,376
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 1 14
12 months or longer 0 18
Total $ 1 $ 32
Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | position 13 88
12 months or longer | position 1 62
Total | position 14 150
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 5,246 $ 710,602
12 months or longer 0 83,378
Total 5,246 793,980
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 10 8,351
12 months or longer 0 789
Total $ 10 $ 9,140