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INVESTMENT SECURITIES - Summary of Unrealized Loss Positions (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
numberOfBank
Dec. 31, 2019
USD ($)
numberOfBank
Investments in an unrealized loss position    
Carrying value of investment securities pledged $ 229,400 $ 68,000
Amount of pretax loss if securities in an unrealized loss position are sold (500)  
Investments in an Unrealized Loss Position    
Less than 12 months, fair value 50,155 31,931
Less than 12 months, unrealized loss (376) (276)
12 months or more, fair value 15,923 43,725
12 months or more, unrealized loss $ (158) $ (661)
United States government agency securities    
Description and Number of Positions    
Number of investments in an unrealized loss position, AFS | numberOfBank 27 26
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 19,021 $ 8,160
Less than 12 months, unrealized loss (68) (59)
12 months or more, fair value 12,574 15,399
12 months or more, unrealized loss $ (142) $ (190)
United States sponsored mortgage-backed securities    
Description and Number of Positions    
Number of investments in an unrealized loss position, AFS | numberOfBank 9 40
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 15,331 $ 16,660
Less than 12 months, unrealized loss (155) (170)
12 months or more, fair value 3,349 27,498
12 months or more, unrealized loss $ (16) $ (454)
Municipal securities    
Description and Number of Positions    
Number of investments in an unrealized loss position, AFS | numberOfBank 14 13
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 11,856 $ 6,018
Less than 12 months, unrealized loss (82) (40)
12 months or more, fair value 0 828
12 months or more, unrealized loss $ 0 $ (17)
Other securities    
Description and Number of Positions    
Number of investments in an unrealized loss position, AFS | numberOfBank 5 2
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 3,947 $ 1,093
Less than 12 months, unrealized loss (71) (7)
12 months or more, fair value 0 0
12 months or more, unrealized loss $ 0 $ 0