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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost $ 2,985,529   $ 3,138,534      
Allowance for Credit Losses (3,439) $ (2,173) (578) $ (411) $ (728) $ 0
Gross Unrealized Gains 2,071   442      
Gross Unrealized Losses (186,221)   (177,383)      
Fair Value 2,797,940   2,961,015      
Equity securities 26,698   26,485      
Investment securities, at fair value 2,824,638   2,987,500      
Available-for-sale debt securities, accrued interest 17,500   16,700      
Asset-backed securities            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 135,188   169,170      
Allowance for Credit Losses (1,563) (790) (578) (411) (728) 0
Gross Unrealized Gains 0   0      
Gross Unrealized Losses (7,088)   (8,050)      
Fair Value 126,537   160,542      
Agency-guaranteed residential collateralized mortgage obligations            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 138,869   147,481      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 0   0      
Gross Unrealized Losses (13,561)   (13,617)      
Fair Value 125,308   133,864      
Collateralized loan obligations            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 848,861   896,992      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 396   88      
Gross Unrealized Losses (18,004)   (24,342)      
Fair Value 831,253   872,738      
Commercial mortgage-backed securities            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 136,941   142,222      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 0   1      
Gross Unrealized Losses (4,467)   (5,866)      
Fair Value 132,474   136,357      
Corporate notes            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 642,757   657,086      
Allowance for Credit Losses (1,876) $ (1,383) 0 $ 0 $ 0 $ 0
Gross Unrealized Gains 206   45      
Gross Unrealized Losses (61,336)   (61,878)      
Fair Value 579,751   595,253      
Private label collateralized mortgage obligations            
Debt Securities, Available-for-sale [Line Items]            
Amortized Cost 1,082,913   1,125,583      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 1,469   308      
Gross Unrealized Losses (81,765)   (63,630)      
Fair Value $ 1,002,617   $ 1,062,261