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INVESTMENT SECURITIES - Allowance for Credit Loss and Unrealized Losses and Fair Values (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Available For Sale Securities, Continuous Unrealized Loss Position, Fair Values    
Less than 12 Months, Fair value $ 122,446 $ 388,077
Less than 12 Months, Unrealized loss 1,290 12,176
12 Months or more, Fair value 687,052 515,505
12 Months or more, Unrealized loss 88,749 100,182
Total, Fair value 809,498 903,582
Total, Unrealized loss 90,039 112,358
U.S. government sponsored entities and U.S. agency securities    
Available For Sale Securities, Continuous Unrealized Loss Position, Fair Values    
Less than 12 Months, Fair value 4,979 4,973
Less than 12 Months, Unrealized loss 7 27
12 Months or more, Fair value 8,979 8,488
12 Months or more, Unrealized loss 1,022 1,512
Total, Fair value 13,958 13,461
Total, Unrealized loss 1,029 1,539
Mortgage-backed securities - agency    
Available For Sale Securities, Continuous Unrealized Loss Position, Fair Values    
Less than 12 Months, Fair value 84,803 300,427
Less than 12 Months, Unrealized loss 1,145 9,735
12 Months or more, Fair value 539,599 385,332
12 Months or more, Unrealized loss 77,432 85,133
Total, Fair value 624,402 685,759
Total, Unrealized loss 78,577 94,868
Mortgage-backed securities - non-agency    
Available For Sale Securities, Continuous Unrealized Loss Position, Fair Values    
Less than 12 Months, Fair value 712 12,433
Less than 12 Months, Unrealized loss 1 33
12 Months or more, Fair value 22,787 24,153
12 Months or more, Unrealized loss 2,569 3,416
Total, Fair value 23,499 36,586
Total, Unrealized loss 2,570 3,449
Asset-backed student loans    
Available For Sale Securities, Continuous Unrealized Loss Position, Fair Values    
Less than 12 Months, Fair value 14,659 17,734
Less than 12 Months, Unrealized loss 36 99
12 Months or more, Fair value 15,263 2,130
12 Months or more, Unrealized loss 93 1
Total, Fair value 29,922 19,864
Total, Unrealized loss 129 100
State and municipal securities    
Available For Sale Securities, Continuous Unrealized Loss Position, Fair Values    
Less than 12 Months, Fair value 7,336 21,209
Less than 12 Months, Unrealized loss 51 365
12 Months or more, Fair value 46,740 43,131
12 Months or more, Unrealized loss 4,522 6,267
Total, Fair value 54,076 64,340
Total, Unrealized loss 4,573 6,632
Collateralized loan obligations    
Available For Sale Securities, Continuous Unrealized Loss Position, Fair Values    
Less than 12 Months, Fair value 9,957 7,468
Less than 12 Months, Unrealized loss 50 7
12 Months or more, Fair value 0 0
12 Months or more, Unrealized loss 0 0
Total, Fair value 9,957 7,468
Total, Unrealized loss 50 7
Corporate securities    
Available For Sale Securities, Continuous Unrealized Loss Position, Fair Values    
Less than 12 Months, Fair value 0 23,833
Less than 12 Months, Unrealized loss 0 1,910
12 Months or more, Fair value 53,684 52,271
12 Months or more, Unrealized loss 3,111 3,853
Total, Fair value 53,684 76,104
Total, Unrealized loss $ 3,111 $ 5,763