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INVESTMENT SECURITIES - Summary of AFS Securities with Unrealized Losses (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Number of Securities    
Less Than 12 Months | security 29 7
12 Months or More | security 3 25
Total | security 32 32
Fair Value    
Less Than 12 Months $ 153,459 $ 54,268
12 Months or More 36,067 225,564
Total 189,526 279,832
Unrealized Losses    
Less Than 12 Months 2,103 2,893
12 Months or More 262 3,695
Total $ 2,365 $ 6,588
U.S. Treasury securities    
Number of Securities    
Less Than 12 Months | security 3  
12 Months or More | security 0  
Total | security 3  
Fair Value    
Less Than 12 Months $ 19,831  
12 Months or More 0  
Total 19,831  
Unrealized Losses    
Less Than 12 Months 256  
12 Months or More 0  
Total $ 256  
States and political subdivisions    
Number of Securities    
Less Than 12 Months | security 11 1
12 Months or More | security 0 0
Total | security 11 1
Fair Value    
Less Than 12 Months $ 40,666 $ 9,079
12 Months or More 0 0
Total 40,666 9,079
Unrealized Losses    
Less Than 12 Months 790 1,125
12 Months or More 0 0
Total $ 790 $ 1,125
GSE residential MBSs    
Number of Securities    
Less Than 12 Months | security 5  
12 Months or More | security 0  
Total | security 5  
Fair Value    
Less Than 12 Months $ 17,354  
12 Months or More 0  
Total 17,354  
Unrealized Losses    
Less Than 12 Months 114  
12 Months or More 0  
Total $ 114  
GSE residential CMOs    
Number of Securities    
Less Than 12 Months | security 7 3
12 Months or More | security 0 0
Total | security 7 3
Fair Value    
Less Than 12 Months $ 43,267 $ 23,954
12 Months or More 0 0
Total 43,267 23,954
Unrealized Losses    
Less Than 12 Months 656 1,071
12 Months or More 0 0
Total $ 656 $ 1,071
Non-agency CMOs    
Number of Securities    
Less Than 12 Months | security 1  
12 Months or More | security 0  
Total | security 1  
Fair Value    
Less Than 12 Months $ 13,257  
12 Months or More 0  
Total 13,257  
Unrealized Losses    
Less Than 12 Months 273  
12 Months or More 0  
Total $ 273  
Private label commercial CMOs    
Number of Securities    
Less Than 12 Months | security   1
12 Months or More | security   10
Total | security   11
Fair Value    
Less Than 12 Months   $ 4,314
12 Months or More   42,403
Total   46,717
Unrealized Losses    
Less Than 12 Months   685
12 Months or More   1,077
Total   $ 1,762
Asset-backed    
Number of Securities    
Less Than 12 Months | security 2 2
12 Months or More | security 3 15
Total | security 5 17
Fair Value    
Less Than 12 Months $ 19,084 $ 16,921
12 Months or More 36,067 183,161
Total 55,151 200,082
Unrealized Losses    
Less Than 12 Months 14 12
12 Months or More 262 2,618
Total $ 276 $ 2,630