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INVESTMENT SECURITIES - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 437,852 $ 460,999
Gross Unrealized Gains 9,531 12,054
Gross Unrealized Losses 2,365 6,588
Fair Value 445,018 466,465
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 20,087  
Gross Unrealized Gains 0  
Gross Unrealized Losses 256  
Fair Value 19,831  
States and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 174,239 104,704
Gross Unrealized Gains 8,072 9,091
Gross Unrealized Losses 790 1,125
Fair Value 181,521 112,670
GSE residential MBSs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 20,552 4,197
Gross Unrealized Gains 80 96
Gross Unrealized Losses 114 0
Fair Value 20,518 4,293
GSE residential CMOs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 69,922 56,856
Gross Unrealized Gains 921 2,226
Gross Unrealized Losses 656 1,071
Fair Value 70,187 58,011
Non-agency CMOs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 25,929 16,505
Gross Unrealized Gains 1 413
Gross Unrealized Losses 273 0
Fair Value 25,657 16,918
Private label commercial CMOs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   63,941
Gross Unrealized Gains   57
Gross Unrealized Losses   1,762
Fair Value   62,236
Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 126,726 214,425
Gross Unrealized Gains 457 171
Gross Unrealized Losses 276 2,630
Fair Value 126,907 211,966
Other    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 397 371
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 397 $ 371