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SECURITIES - Schedule of Fair Values and Gross Unrealized and Unrecognized Losses on Investments (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
security
Jun. 30, 2023
USD ($)
security
Fair Value    
Less than 12 Months $ 90,198 $ 180,298
12 Months or More 986,493 1,008,181
Fair Value 1,076,691 1,188,479
Unrealized Losses    
Less than 12 Months 3,592 3,700
12 Months or More 182,173 152,712
Unrealized Losses $ 185,765 $ 156,412
Number of Securities | security 191 191
Fair Value    
Less than 12 Months $ 41,109 $ 51,777
12 Months or More 81,919 79,392
Fair Value 123,028 131,169
Unrecognized Losses    
Less than 12 Months 1,267 587
12 Months or More 19,435 14,709
Unrecognized Losses $ 20,702 $ 15,296
Number of Securities | security 39 42
Obligations of state and political subdivisions    
Fair Value    
Less than 12 Months $ 4,439 $ 13,642
12 Months or More 10,177 2,088
Fair Value 14,616 15,730
Unrecognized Losses    
Less than 12 Months 171 268
12 Months or More 408 53
Unrecognized Losses $ 579 $ 321
Number of Securities | security 29 32
Asset-backed securities    
Fair Value    
Less than 12 Months $ 20,580 $ 33,833
12 Months or More 94,790 98,828
Fair Value 115,370 132,661
Unrealized Losses    
Less than 12 Months 139 129
12 Months or More 1,652 1,986
Unrealized Losses $ 1,791 $ 2,115
Number of Securities | security 14 14
Collateralized loan obligations    
Fair Value    
Less than 12 Months $ 0 $ 46,903
12 Months or More 288,961 294,813
Fair Value 288,961 341,716
Unrealized Losses    
Less than 12 Months 0 135
12 Months or More 2,635 5,052
Unrealized Losses $ 2,635 $ 5,187
Number of Securities | security 24 26
Corporate bonds    
Fair Value    
Less than 12 Months $ 6,857 $ 25,511
12 Months or More 128,821 109,507
Fair Value 135,678 135,018
Unrealized Losses    
Less than 12 Months 8 1,354
12 Months or More 23,928 23,294
Unrealized Losses $ 23,936 $ 24,648
Number of Securities | security 31 31
Commercial pass-through securities    
Fair Value    
Less than 12 Months $ 61,446 $ 63,531
12 Months or More 75,018 79,863
Fair Value 136,464 143,394
Unrealized Losses    
Less than 12 Months 3,389 1,380
12 Months or More 24,053 19,725
Unrealized Losses $ 27,442 $ 21,105
Number of Securities | security 12 12
Fair Value    
Less than 12 Months $ 0 $ 0
12 Months or More 9,651 10,009
Fair Value 9,651 10,009
Unrecognized Losses    
Less than 12 Months 0 0
12 Months or More 2,589 2,239
Unrecognized Losses $ 2,589 $ 2,239
Number of Securities | security 1 1
Residential pass-through securities    
Fair Value    
Less than 12 Months $ 1,315 $ 10,520
12 Months or More 398,903 425,170
Fair Value 400,218 435,690
Unrealized Losses    
Less than 12 Months 56 702
12 Months or More 129,905 102,655
Unrealized Losses $ 129,961 $ 103,357
Number of Securities | security 110 108
Fair Value    
Less than 12 Months $ 36,670 $ 38,135
12 Months or More 62,091 67,295
Fair Value 98,761 105,430
Unrecognized Losses    
Less than 12 Months 1,096 319
12 Months or More 16,438 12,417
Unrecognized Losses $ 17,534 $ 12,736
Number of Securities | security 9 9