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SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Investment Holdings [Line Items]    
Amortized Cost $ 620,519 $ 571,977
Gross Unrealized Gains 11,823 14,637
Gross Unrealized Losses (5,939) (1,568)
Fair Value 626,403 585,046
US Government-sponsored enterprises    
Investment Holdings [Line Items]    
Amortized Cost 213,049 206,834
Gross Unrealized Gains 4,860 6,018
Gross Unrealized Losses (3,302) (462)
Fair Value 214,607 212,390
US Government agency    
Investment Holdings [Line Items]    
Amortized Cost 74,293 82,878
Gross Unrealized Gains 2,211 2,870
Gross Unrealized Losses (319) (116)
Fair Value 76,185 85,632
Private label    
Investment Holdings [Line Items]    
Amortized Cost 47,576 19,810
Gross Unrealized Gains 111 40
Gross Unrealized Losses (146) (141)
Fair Value 47,541 19,709
Obligations of states and political subdivisions thereof    
Investment Holdings [Line Items]    
Amortized Cost 185,985 164,766
Gross Unrealized Gains 3,081 4,244
Gross Unrealized Losses (1,203) (6)
Fair Value 187,863 169,004
Corporate bonds    
Investment Holdings [Line Items]    
Amortized Cost 99,616 97,689
Gross Unrealized Gains 1,560 1,465
Gross Unrealized Losses (969) (843)
Fair Value $ 100,207 $ 98,311