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INVESTMENT SECURITIES - Summary of AFS Securities with Unrealized Losses (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Number of Securities    
Less Than 12 Months | security 11 12
12 Months or More | security 94 91
Total | security 105 103
Fair Value    
Less Than 12 Months $ 31,125 $ 27,525
12 Months or More 428,508 422,911
Total 459,633 450,436
Unrealized Losses    
Less Than 12 Months 263 326
12 Months or More 38,180 36,561
Total $ 38,443 $ 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 17,669 17,840
Total 17,669 17,840
Unrealized Losses    
Less Than 12 Months 0 0
12 Months or More 2,385 2,217
Total $ 2,385 $ 2,217
States and political subdivisions    
Number of Securities    
Less Than 12 Months | security 3 4
12 Months or More | security 41 40
Total | security 44 44
Fair Value    
Less Than 12 Months $ 1,983 $ 2,419
12 Months or More 198,128 199,933
Total 200,111 202,352
Unrealized Losses    
Less Than 12 Months 65 53
12 Months or More 20,203 18,477
Total $ 20,268 $ 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 57,956 57,632
Total 57,956 57,632
Unrealized Losses    
Less Than 12 Months 0 0
12 Months or More 3,512 4,037
Total $ 3,512 $ 4,037
GSE residential CMOs    
Number of Securities    
Less Than 12 Months | security 6 4
12 Months or More | security 15 14
Total | security 21 18
Fair Value    
Less Than 12 Months $ 25,516 $ 12,710
12 Months or More 60,657 56,765
Total 86,173 69,475
Unrealized Losses    
Less Than 12 Months 159 186
12 Months or More 6,579 6,014
Total $ 6,738 $ 6,200
Non-agency CMOs    
Number of Securities    
Less Than 12 Months | security 2 3
12 Months or More | security 5 4
Total | security 7 7
Fair Value    
Less Than 12 Months $ 3,626 $ 11,531
12 Months or More 22,536 16,334
Total 26,162 27,865
Unrealized Losses    
Less Than 12 Months 39 83
12 Months or More 3,697 3,726
Total $ 3,736 $ 3,809
Asset-backed    
Number of Securities    
Less Than 12 Months | security 0 1
12 Months or More | security 15 15
Total | security 15 16
Fair Value    
Less Than 12 Months $ 0 $ 865
12 Months or More 71,562 74,407
Total 71,562 75,272
Unrealized Losses    
Less Than 12 Months 0 4
12 Months or More 1,804 2,090
Total $ 1,804 $ 2,094