XML 76 R62.htm IDEA: XBRL DOCUMENT v3.22.4
Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 3,138,534 $ 3,799,851
Allowance for Credit Losses (578)  
Gross Unrealized Gains 442 7,427
Gross Unrealized Losses (177,383) (15,703)
Fair Value 2,961,015 3,791,575
Equity securities 26,485 25,575
Investment securities, at fair value 2,987,500 3,817,150
Available-for-sale debt securities, accrued interest $ 16,700 $ 11,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable Accrued interest receivable
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 169,170 $ 297,291
Allowance for Credit Losses (578) 0
Gross Unrealized Gains 0 253
Gross Unrealized Losses (8,050) (119)
Fair Value 160,542 297,425
Agency-guaranteed residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   9,865
Gross Unrealized Gains   0
Gross Unrealized Losses   (312)
Fair Value   9,553
Agency-guaranteed commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   2,162
Gross Unrealized Gains   0
Gross Unrealized Losses   (10)
Fair Value   2,152
Agency-guaranteed residential collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 147,481 199,091
Allowance for Credit Losses 0  
Gross Unrealized Gains 0 154
Gross Unrealized Losses (13,617) (2,315)
Fair Value 133,864 196,930
Agency-guaranteed commercial collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   242,668
Gross Unrealized Gains   53
Gross Unrealized Losses   (3,877)
Fair Value   238,844
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 896,992 1,067,770
Allowance for Credit Losses 0  
Gross Unrealized Gains 88 247
Gross Unrealized Losses (24,342) (1,215)
Fair Value 872,738 1,066,802
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 142,222 149,054
Allowance for Credit Losses 0  
Gross Unrealized Gains 1 53
Gross Unrealized Losses (5,866) (180)
Fair Value 136,357 148,927
Corporate notes    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 657,086 575,273
Allowance for Credit Losses 0  
Gross Unrealized Gains 45 6,334
Gross Unrealized Losses (61,878) (1,561)
Fair Value 595,253 580,046
Private label collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,125,583 1,248,142
Allowance for Credit Losses 0  
Gross Unrealized Gains 308 333
Gross Unrealized Losses (63,630) (6,010)
Fair Value $ 1,062,261 1,242,465
State and political subdivision debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   8,535
Gross Unrealized Gains   0
Gross Unrealized Losses   (104)
Fair Value   $ 8,431