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INVESTMENT SECURITIES, Investment Securities in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
position
Dec. 31, 2019
USD ($)
position
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions    
Less than 12 months | position 107 88
12 months or longer | position 3 62
Total | position 110 150
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 67,768 $ 710,602
12 months or longer 14 83,378
Total 67,782 793,980
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses    
Less than 12 months 286 8,351
12 months or longer 0 789
Total $ 286 $ 9,140
Equity and Other Securities, Continuous Unrealized Loss Position, Number of Positions    
Less than 12 months | position 1  
12 months or longer | position 0  
Total | position 1  
Equity and Other Securities, Continuous Unrealized Loss Position, Fair Value    
Less than 12 months $ 81  
12 months or longer 0  
Total 81  
Equity and Other Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 20  
12 months or longer 0  
Total 20  
Available-for-sale, allowance for credit losses $ 0  
U.S. Treasury Securities [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions    
Less than 12 months | position 1 12
12 months or longer | position 0 5
Total | position 1 17
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 1,010 $ 592,678
12 months or longer 0 25,998
Total 1,010 618,676
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses    
Less than 12 months 0 7,970
12 months or longer 0 5
Total $ 0 $ 7,975
Obligations of State and Political Subdivisions [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions    
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    
Less than 12 months $ 196 $ 22,716
12 months or longer 0 0
Total 196 22,716
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses    
Less than 12 months 0 26
12 months or longer 0 0
Total $ 0 $ 26
Government Agency Mortgage-Backed Securities [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions    
Less than 12 months | position 91 50
12 months or longer | position 2 52
Total | position 93 102
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 62,318 $ 89,237
12 months or longer 14 52,975
Total 62,332 142,212
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses    
Less than 12 months 278 341
12 months or longer 0 766
Total $ 278 $ 1,107
Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions    
Less than 12 months | position 14 5
12 months or longer | position 1 5
Total | position 15 10
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value    
Less than 12 months $ 4,244 $ 5,971
12 months or longer 0 4,405
Total 4,244 10,376
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses    
Less than 12 months 8 14
12 months or longer 0 18
Total $ 8 $ 32
Equity Securities, at Fair Value [Member]    
Equity and Other Securities, Continuous Unrealized Loss Position, Number of Positions    
Less than 12 months | position 1  
12 months or longer | position 0  
Total | position 1  
Equity and Other Securities, Continuous Unrealized Loss Position, Fair Value    
Less than 12 months $ 81  
12 months or longer 0  
Total 81  
Equity and Other Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses    
Less than 12 months 20  
12 months or longer 0  
Total $ 20