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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value $ 2,416,144 $ 2,024,753
Less than 12 Months, Unrealized Losses (145,487) (15,567)
12 Months or More, Fair Value 244,845 6,818
12 Months or More, Unrealized Losses (20,423) (136)
Total, Fair Value 2,660,989 2,031,571
Total, Unrealized Losses (165,910) (15,703)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 186,085 54,753
Less than 12 Months, Unrealized Losses (5,811) (119)
12 Months or More, Fair Value 11,154 0
12 Months or More, Unrealized Losses (846) 0
Total, Fair Value 197,239 54,753
Total, Unrealized Losses (6,657) (119)
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value   9,554
Less than 12 Months, Unrealized Losses   (312)
12 Months or More, Fair Value   0
12 Months or More, Unrealized Losses   0
Total, Fair Value   9,554
Total, Unrealized Losses   (312)
Agency-guaranteed commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value   2,152
Less than 12 Months, Unrealized Losses   (10)
12 Months or More, Fair Value   0
12 Months or More, Unrealized Losses   0
Total, Fair Value   2,152
Total, Unrealized Losses   (10)
Agency-guaranteed residential collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 138,222 173,492
Less than 12 Months, Unrealized Losses (13,786) (2,315)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 138,222 173,492
Total, Unrealized Losses (13,786) (2,315)
Agency-guaranteed commercial collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value   118,334
Less than 12 Months, Unrealized Losses   (3,877)
12 Months or More, Fair Value   0
12 Months or More, Unrealized Losses   0
Total, Fair Value   118,334
Total, Unrealized Losses   (3,877)
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 787,365 715,250
Less than 12 Months, Unrealized Losses (27,078) (1,215)
12 Months or More, Fair Value 35,670 0
12 Months or More, Unrealized Losses (1,078) 0
Total, Fair Value 823,035 715,250
Total, Unrealized Losses (28,156) (1,215)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 130,010 122,597
Less than 12 Months, Unrealized Losses (4,027) (180)
12 Months or More, Fair Value 4,847 0
12 Months or More, Unrealized Losses (102) 0
Total, Fair Value 134,857 122,597
Total, Unrealized Losses (4,129) (180)
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 454,386 188,100
Less than 12 Months, Unrealized Losses (49,635) (1,561)
12 Months or More, Fair Value 55,850 0
12 Months or More, Unrealized Losses (5,720) 0
Total, Fair Value 510,236 188,100
Total, Unrealized Losses (55,355) (1,561)
Private label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 720,076 632,091
Less than 12 Months, Unrealized Losses (45,150) (5,874)
12 Months or More, Fair Value 129,973 6,818
12 Months or More, Unrealized Losses (11,505) (136)
Total, Fair Value 850,049 638,909
Total, Unrealized Losses (56,655) (6,010)
State and political subdivision debt securities    
Debt Securities, Available-for-sale [Line Items]    
Less Than 12 Months, Fair Value 0 8,430
Less than 12 Months, Unrealized Losses 0 (104)
12 Months or More, Fair Value 7,351 0
12 Months or More, Unrealized Losses (1,172) 0
Total, Fair Value 7,351 8,430
Total, Unrealized Losses $ (1,172) $ (104)