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INVESTMENT SECURITIES - Summary of AFS Securities with Unrealized Losses (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Number of Securities    
Less Than 12 Months | security 17 12
12 Months or More | security 88 91
Total | security 105 103
Fair Value    
Less Than 12 Months $ 98,110 $ 27,525
12 Months or More 397,484 422,911
Total 495,594 450,436
Unrealized Losses    
Less Than 12 Months 379 326
12 Months or More 28,175 36,561
Total $ 28,554 $ 36,887
U.S. Treasury securities    
Number of Securities    
Less Than 12 Months | security 0 0
12 Months or More | security 3 3
Total | security 3 3
Fair Value    
Less Than 12 Months $ 0 $ 0
12 Months or More 18,373 17,840
Total 18,373 17,840
Unrealized Losses    
Less Than 12 Months 0 0
12 Months or More 1,674 2,217
Total $ 1,674 $ 2,217
States and political subdivisions    
Number of Securities    
Less Than 12 Months | security 1 4
12 Months or More | security 41 40
Total | security 42 44
Fair Value    
Less Than 12 Months $ 501 $ 2,419
12 Months or More 194,611 199,933
Total 195,112 202,352
Unrealized Losses    
Less Than 12 Months 6 53
12 Months or More 15,104 18,477
Total $ 15,110 $ 18,530
GSE residential MBSs    
Number of Securities    
Less Than 12 Months | security 0 0
12 Months or More | security 15 15
Total | security 15 15
Fair Value    
Less Than 12 Months $ 0 $ 0
12 Months or More 56,909 57,632
Total 56,909 57,632
Unrealized Losses    
Less Than 12 Months 0 0
12 Months or More 2,823 4,037
Total $ 2,823 $ 4,037
GSE commercial MBSs    
Number of Securities    
Less Than 12 Months | security 1  
12 Months or More | security 0  
Total | security 1  
Fair Value    
Less Than 12 Months $ 854  
12 Months or More 0  
Total 854  
Unrealized Losses    
Less Than 12 Months 1  
12 Months or More 0  
Total $ 1  
GSE residential CMOs    
Number of Securities    
Less Than 12 Months | security 11 4
12 Months or More | security 16 14
Total | security 27 18
Fair Value    
Less Than 12 Months $ 84,243 $ 12,710
12 Months or More 65,610 56,765
Total 149,853 69,475
Unrealized Losses    
Less Than 12 Months 326 186
12 Months or More 4,755 6,014
Total $ 5,081 $ 6,200
Non-agency CMOs    
Number of Securities    
Less Than 12 Months | security 0 3
12 Months or More | security 4 4
Total | security 4 7
Fair Value    
Less Than 12 Months $ 0 $ 11,531
12 Months or More 16,353 16,334
Total 16,353 27,865
Unrealized Losses    
Less Than 12 Months 0 83
12 Months or More 2,772 3,726
Total $ 2,772 $ 3,809
Asset-backed    
Number of Securities    
Less Than 12 Months | security 4 1
12 Months or More | security 9 15
Total | security 13 16
Fair Value    
Less Than 12 Months $ 12,512 $ 865
12 Months or More 45,628 74,407
Total 58,140 75,272
Unrealized Losses    
Less Than 12 Months 46 4
12 Months or More 1,047 2,090
Total $ 1,093 $ 2,094