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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost $ 3,069,336 $ 3,138,534    
Allowance for Credit Losses (2,173) (578) $ (728) $ 0
Gross Unrealized Gains 1,619 442    
Gross Unrealized Losses (168,523) (177,383)    
Fair Value 2,900,259 2,961,015    
Equity securities 26,710 26,485    
Investment securities, at fair value 2,926,969 2,987,500    
Available-for-sale debt securities, accrued interest 19,600 16,700    
Asset-backed securities        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 154,151 169,170    
Allowance for Credit Losses (790) (578) (728) 0
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (5,426) (8,050)    
Fair Value 147,935 160,542    
Agency-guaranteed residential collateralized mortgage obligations        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 143,717 147,481    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (9,964) (13,617)    
Fair Value 133,753 133,864    
Collateralized loan obligations        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 875,303 896,992    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 285 88    
Gross Unrealized Losses (21,488) (24,342)    
Fair Value 854,100 872,738    
Commercial mortgage-backed securities        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 142,050 142,222    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 4 1    
Gross Unrealized Losses (5,236) (5,866)    
Fair Value 136,818 136,357    
Corporate notes        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 642,859 657,086    
Allowance for Credit Losses (1,383) 0 $ 0 $ 0
Gross Unrealized Gains 379 45    
Gross Unrealized Losses (55,060) (61,878)    
Fair Value 586,795 595,253    
Private label collateralized mortgage obligations        
Debt Securities, Available-for-sale [Line Items]        
Amortized Cost 1,111,256 1,125,583    
Allowance for Credit Losses 0 0    
Gross Unrealized Gains 951 308    
Gross Unrealized Losses (71,349) (63,630)    
Fair Value $ 1,040,858 $ 1,062,261