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INVESTMENT SECURITIES - Summary of AFS Securities with Unrealized Losses (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Number of Securities    
Less Than 12 Months | security 20 63
12 Months or More | security 81 46
Total | security 101 109
Fair Value    
Less Than 12 Months $ 70,756 $ 295,839
12 Months or More 410,178 206,080
Total 480,934 501,919
Unrealized Losses    
Less Than 12 Months 3,462 20,185
12 Months or More 38,432 29,855
Total $ 41,894 $ 50,040
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 17,693 17,291
Total 17,693 17,291
Unrealized Losses    
Less Than 12 Months 0 0
12 Months or More 2,374 2,779
Total $ 2,374 $ 2,779
States and political subdivisions    
Number of Securities    
Less Than 12 Months | security 10 29
12 Months or More | security 33 17
Total | security 43 46
Fair Value    
Less Than 12 Months $ 25,901 $ 135,579
12 Months or More 174,145 60,102
Total 200,046 195,681
Unrealized Losses    
Less Than 12 Months 883 13,809
12 Months or More 20,860 14,621
Total $ 21,743 $ 28,430
GSE residential MBSs    
Number of Securities    
Less Than 12 Months | security 0 5
12 Months or More | security 15 10
Total | security 15 15
Fair Value    
Less Than 12 Months $ 0 $ 26,100
12 Months or More 59,371 33,302
Total 59,371 59,402
Unrealized Losses    
Less Than 12 Months 0 925
12 Months or More 3,943 3,451
Total $ 3,943 $ 4,376
GSE residential CMOs    
Number of Securities    
Less Than 12 Months | security 2 8
12 Months or More | security 13 9
Total | security 15 17
Fair Value    
Less Than 12 Months $ 10,157 $ 28,732
12 Months or More 57,218 39,646
Total 67,375 68,378
Unrealized Losses    
Less Than 12 Months 118 1,884
12 Months or More 5,762 5,184
Total $ 5,880 $ 7,068
Non-agency CMOs    
Number of Securities    
Less Than 12 Months | security 4 4
12 Months or More | security 2 2
Total | security 6 6
Fair Value    
Less Than 12 Months $ 25,164 $ 26,555
12 Months or More 8,050 8,639
Total 33,214 35,194
Unrealized Losses    
Less Than 12 Months 2,347 1,135
12 Months or More 2,129 1,648
Total $ 4,476 $ 2,783
Asset-backed    
Number of Securities    
Less Than 12 Months | security 4 17
12 Months or More | security 15 5
Total | security 19 22
Fair Value    
Less Than 12 Months $ 9,534 $ 78,873
12 Months or More 93,701 47,100
Total 103,235 125,973
Unrealized Losses    
Less Than 12 Months 114 2,432
12 Months or More 3,364 2,172
Total $ 3,478 $ 4,604