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INVESTMENT SECURITIES - Summary of Unrealized Loss Positions (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
numberOfBank
Dec. 31, 2020
USD ($)
numberOfBank
Investments in an unrealized loss position    
Carrying value of investment securities pledged $ 244,600 $ 229,400
Amount of pretax loss if securities in an unrealized loss position are sold (4,600)  
Investments in an Unrealized Loss Position    
Less than 12 months, fair value 203,065 50,155
Less than 12 months, unrealized loss (3,437) (376)
12 months or more, fair value 36,616 15,923
12 months or more, unrealized loss $ (1,202) $ (158)
United States government agency securities    
Description and Number of Positions    
Number of investments in an unrealized loss position, AFS | numberOfBank 21 27
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 5,101 $ 19,021
Less than 12 months, unrealized loss (77) (68)
12 months or more, fair value 21,770 12,574
12 months or more, unrealized loss $ (819) $ (142)
United States sponsored mortgage-backed securities    
Description and Number of Positions    
Number of investments in an unrealized loss position, AFS | numberOfBank 30 9
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 55,354 $ 15,331
Less than 12 months, unrealized loss (1,346) (155)
12 months or more, fair value 7,845 3,349
12 months or more, unrealized loss $ (287) $ (16)
United States treasury securities    
Description and Number of Positions    
Number of investments in an unrealized loss position, AFS | numberOfBank 24  
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 110,389  
Less than 12 months, unrealized loss (1,744)  
12 months or more, fair value 0  
12 months or more, unrealized loss $ 0  
Municipal securities    
Description and Number of Positions    
Number of investments in an unrealized loss position, AFS | numberOfBank 53 14
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 32,221 $ 11,856
Less than 12 months, unrealized loss (270) (82)
12 months or more, fair value 7,001 0
12 months or more, unrealized loss $ (96) $ 0
Corporate debt securities    
Description and Number of Positions    
Number of investments in an unrealized loss position, AFS | numberOfBank   5
Investments in an Unrealized Loss Position    
Less than 12 months, fair value   $ 3,947
Less than 12 months, unrealized loss   (71)
12 months or more, fair value   0
12 months or more, unrealized loss   $ 0