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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost $ 3,242,361   $ 3,799,851
Allowance for Credit Losses (411)    
Gross Unrealized Gains 376   7,427
Gross Unrealized Losses (122,215)   (15,703)
Fair Value 3,120,111   3,791,575
Equity securities 24,771   25,575
Investment securities, at fair value 3,144,882   3,817,150
Available-for-sale debt securities, accrued interest 13,000   11,000
Asset-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 223,661   297,291
Allowance for Credit Losses (411) $ (728) 0
Gross Unrealized Gains 0   253
Gross Unrealized Losses (3,529)   (119)
Fair Value 219,721   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 156,339   199,091
Allowance for Credit Losses 0    
Gross Unrealized Gains 0   154
Gross Unrealized Losses (9,219)   (2,315)
Fair Value 147,120   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 974,213   1,067,770
Allowance for Credit Losses 0    
Gross Unrealized Gains 0   247
Gross Unrealized Losses (23,645)   (1,215)
Fair Value 950,568   1,066,802
Commercial mortgage-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 138,972   149,054
Allowance for Credit Losses 0    
Gross Unrealized Gains 0   53
Gross Unrealized Losses (3,188)   (180)
Fair Value 135,784   148,927
Corporate notes      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 579,324   575,273
Allowance for Credit Losses 0    
Gross Unrealized Gains 376   6,334
Gross Unrealized Losses (33,856)   (1,561)
Fair Value 545,844   580,046
Private label collateralized mortgage obligations      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 1,161,325   1,248,142
Allowance for Credit Losses 0    
Gross Unrealized Gains 0   333
Gross Unrealized Losses (47,988)   (6,010)
Fair Value 1,113,337   1,242,465
State and political subdivision debt securities      
Debt Securities, Available-for-sale [Line Items]      
Amortized Cost 8,527   8,535
Allowance for Credit Losses 0    
Gross Unrealized Gains 0   0
Gross Unrealized Losses (790)   (104)
Fair Value $ 7,737   $ 8,431