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Disclosures about Fair Value of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring and Non-recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Assets    
Derivatives $ 15,263 $ 17,931
Loans held for sale, fair value 163,891 189,277
Loans receivable, mortgage warehouse – fair value option 14,104,884 12,513,386
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Derivatives 0 0
Loans receivable, mortgage warehouse – fair value option 0 0
Significant Other Observable Inputs (Level 2)    
Assets    
Derivatives 15,223 17,906
Loans receivable, mortgage warehouse – fair value option 1,321,128 897,912
Significant Unobservable Inputs (Level 3)    
Assets    
Derivatives 40 25
Loans receivable, mortgage warehouse – fair value option 12,783,756 11,615,474
Measured at Fair Value on a Recurring Basis:    
Assets    
Derivatives 15,263 17,931
Loans held for sale, fair value 163,891 189,277
Loans receivable, mortgage warehouse – fair value option 1,321,128 897,912
Assets, fair value 3,485,720 3,481,980
Measured at Fair Value on a Recurring Basis: | Asset-backed securities    
Assets    
Available for sale securities 13,236 92,629
Measured at Fair Value on a Recurring Basis: | Agency-guaranteed residential mortgage-backed securities    
Assets    
Available for sale securities 327,038  
Measured at Fair Value on a Recurring Basis: | Agency-guaranteed residential collateralized mortgage obligations    
Assets    
Available for sale securities 226,746 116,908
Measured at Fair Value on a Recurring Basis: | Agency-guaranteed commercial mortgage-backed securities    
Assets    
Available for sale securities 93,075  
Measured at Fair Value on a Recurring Basis: | Collateralized loan obligations    
Assets    
Available for sale securities 255,407 489,092
Measured at Fair Value on a Recurring Basis: | Commercial mortgage-backed securities    
Assets    
Available for sale securities 77,708 121,636
Measured at Fair Value on a Recurring Basis: | Corporate notes    
Assets    
Available for sale securities 516,330 583,034
Measured at Fair Value on a Recurring Basis: | Private label collateralized mortgage obligations    
Assets    
Available for sale securities 475,898 973,561
Measured at Fair Value on a Recurring Basis: | Derivatives    
Liabilities    
Liabilities, fair value 22,570 27,110
Measured at Fair Value on a Recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Derivatives 0 0
Loans held for sale, fair value 0 0
Loans receivable, mortgage warehouse – fair value option 0 0
Assets, fair value 0 0
Measured at Fair Value on a Recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities    
Assets    
Available for sale securities 0 0
Measured at Fair Value on a Recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed residential mortgage-backed securities    
Assets    
Available for sale securities 0  
Measured at Fair Value on a Recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed residential collateralized mortgage obligations    
Assets    
Available for sale securities 0 0
Measured at Fair Value on a Recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency-guaranteed commercial mortgage-backed securities    
Assets    
Available for sale securities 0  
Measured at Fair Value on a Recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations    
Assets    
Available for sale securities 0 0
Measured at Fair Value on a Recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities    
Assets    
Available for sale securities 0 0
Measured at Fair Value on a Recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate notes    
Assets    
Available for sale securities 0 0
Measured at Fair Value on a Recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private label collateralized mortgage obligations    
Assets    
Available for sale securities 0 0
Measured at Fair Value on a Recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives    
Liabilities    
Liabilities, fair value 0 0
Measured at Fair Value on a Recurring Basis: | Significant Other Observable Inputs (Level 2)    
Assets    
Derivatives 15,223 17,906
Loans held for sale, fair value 1,836 1,215
Loans receivable, mortgage warehouse – fair value option 1,321,128 897,912
Assets, fair value 3,310,389 3,258,944
Measured at Fair Value on a Recurring Basis: | Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Assets    
Available for sale securities 0 57,680
Measured at Fair Value on a Recurring Basis: | Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential mortgage-backed securities    
Assets    
Available for sale securities 327,038  
Measured at Fair Value on a Recurring Basis: | Significant Other Observable Inputs (Level 2) | Agency-guaranteed residential collateralized mortgage obligations    
Assets    
Available for sale securities 226,746 116,908
Measured at Fair Value on a Recurring Basis: | Significant Other Observable Inputs (Level 2) | Agency-guaranteed commercial mortgage-backed securities    
Assets    
Available for sale securities 93,075  
Measured at Fair Value on a Recurring Basis: | Significant Other Observable Inputs (Level 2) | Collateralized loan obligations    
Assets    
Available for sale securities 255,407 489,092
Measured at Fair Value on a Recurring Basis: | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities    
Assets    
Available for sale securities 77,708 121,636
Measured at Fair Value on a Recurring Basis: | Significant Other Observable Inputs (Level 2) | Corporate notes    
Assets    
Available for sale securities 516,330 583,034
Measured at Fair Value on a Recurring Basis: | Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations    
Assets    
Available for sale securities 475,898 973,561
Measured at Fair Value on a Recurring Basis: | Significant Other Observable Inputs (Level 2) | Derivatives    
Liabilities    
Liabilities, fair value 22,570 27,110
Measured at Fair Value on a Recurring Basis: | Significant Unobservable Inputs (Level 3)    
Assets    
Derivatives 40 25
Loans held for sale, fair value 162,055 188,062
Loans receivable, mortgage warehouse – fair value option 0 0
Assets, fair value 175,331 223,036
Measured at Fair Value on a Recurring Basis: | Significant Unobservable Inputs (Level 3) | Asset-backed securities    
Assets    
Available for sale securities 13,236 34,949
Measured at Fair Value on a Recurring Basis: | Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential mortgage-backed securities    
Assets    
Available for sale securities 0  
Measured at Fair Value on a Recurring Basis: | Significant Unobservable Inputs (Level 3) | Agency-guaranteed residential collateralized mortgage obligations    
Assets    
Available for sale securities 0 0
Measured at Fair Value on a Recurring Basis: | Significant Unobservable Inputs (Level 3) | Agency-guaranteed commercial mortgage-backed securities    
Assets    
Available for sale securities 0  
Measured at Fair Value on a Recurring Basis: | Significant Unobservable Inputs (Level 3) | Collateralized loan obligations    
Assets    
Available for sale securities 0 0
Measured at Fair Value on a Recurring Basis: | Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities    
Assets    
Available for sale securities 0 0
Measured at Fair Value on a Recurring Basis: | Significant Unobservable Inputs (Level 3) | Corporate notes    
Assets    
Available for sale securities 0 0
Measured at Fair Value on a Recurring Basis: | Significant Unobservable Inputs (Level 3) | Private label collateralized mortgage obligations    
Assets    
Available for sale securities 0 0
Measured at Fair Value on a Recurring Basis: | Significant Unobservable Inputs (Level 3) | Derivatives    
Liabilities    
Liabilities, fair value 0 0
Measured at Fair Value on a Nonrecurring Basis:    
Assets    
Assets, fair value 18,048 2,373
Measured at Fair Value on a Nonrecurring Basis: | Collateral-dependent loans    
Assets    
Assets, fair value 18,048 2,373
Measured at Fair Value on a Nonrecurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Assets, fair value 0 0
Measured at Fair Value on a Nonrecurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral-dependent loans    
Assets    
Assets, fair value 0 0
Measured at Fair Value on a Nonrecurring Basis: | Significant Other Observable Inputs (Level 2)    
Assets    
Assets, fair value 0 0
Measured at Fair Value on a Nonrecurring Basis: | Significant Other Observable Inputs (Level 2) | Collateral-dependent loans    
Assets    
Assets, fair value 0 0
Measured at Fair Value on a Nonrecurring Basis: | Significant Unobservable Inputs (Level 3)    
Assets    
Assets, fair value 18,048 2,373
Measured at Fair Value on a Nonrecurring Basis: | Significant Unobservable Inputs (Level 3) | Collateral-dependent loans    
Assets    
Assets, fair value $ 18,048 $ 2,373