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INVESTMENT SECURITIES - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 409,220 $ 618,574
Less than 12 Months, Unrealized Losses (3,659) (11,103)
12 Months or More, Fair Value 900,154 974,040
12 Months or More, Unrealized Losses (46,367) (56,938)
Total, Fair Value 1,309,374 1,592,614
Total, Unrealized Losses (50,026) (68,041)
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 191,812 266,568
Less than 12 Months, Unrealized Losses (1,111) (3,745)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 191,812 266,568
Total, Unrealized Losses (1,111) (3,745)
Agency-guaranteed residential collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 126,602
Less than 12 Months, Unrealized Losses 0 (2,717)
12 Months or More, Fair Value 99,860 100,144
12 Months or More, Unrealized Losses (10,080) (13,395)
Total, Fair Value 99,860 226,746
Total, Unrealized Losses (10,080) (16,112)
Agency-guaranteed commercial collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 59,818 85,902
Less than 12 Months, Unrealized Losses (1,571) (2,819)
12 Months or More, Fair Value 16,881 0
12 Months or More, Unrealized Losses (685) 0
Total, Fair Value 76,699 85,902
Total, Unrealized Losses (2,256) (2,819)
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 35,710
Less than 12 Months, Unrealized Losses 0 (265)
12 Months or More, Fair Value 131,203 205,639
12 Months or More, Unrealized Losses (290) (1,928)
Total, Fair Value 131,203 241,349
Total, Unrealized Losses (290) (2,193)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value   0
Less than 12 Months, Unrealized Losses   0
12 Months or More, Fair Value   77,708
12 Months or More, Unrealized Losses   (999)
Total, Fair Value   77,708
Total, Unrealized Losses   (999)
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 68,532 74,373
Less than 12 Months, Unrealized Losses (716) (976)
12 Months or More, Fair Value 266,678 239,509
12 Months or More, Unrealized Losses (12,087) (16,064)
Total, Fair Value 335,210 313,882
Total, Unrealized Losses (12,803) (17,040)
Private label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 89,058 29,419
Less than 12 Months, Unrealized Losses (261) (581)
12 Months or More, Fair Value 385,532 351,040
12 Months or More, Unrealized Losses (23,225) (24,552)
Total, Fair Value 474,590 380,459
Total, Unrealized Losses $ (23,486) $ (25,133)