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Fair Values of Assets and Liabilities (Narrative) (Detail)
 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities $ 3,243,017,000 $ 2,327,793,000    
Loans held-for-investment 179,932,000 38,598,000    
MSRs 230,225,000 147,571,000 $ 92,081,000 $ 85,638,000
Individually assessed loans - foreclosure probable and collateral-dependent 90,197,000 93,270,000    
Estimate of Fair Value Measurement        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 3,243,017,000 2,327,793,000    
Remaining contractual principal balance outstanding, mortgage loans held-for-sale 308,900,000 801,600,000    
Remaining contractual principal balance outstanding, mortgage loans held-for-investment 184,000,000 38,400,000    
Non-performing        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage loans held-for-sale classified as nonaccrual 5,800,000      
Mortgage loans held-for-sale classified greater than 90 days past due and still accruing $ 44,000,000 125,500,000    
Weighted Average | Loans held-for-investment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Life of loans 5 years 9 months 18 days      
Appraisal adjustment - cost of sale | Other real estate owned        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other real estate owned, measurement input 0.10      
Measured at fair value on a recurring basis:        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage loans held-for-sale $ 299,935,000 817,912,000    
Loans held-for-investment 179,932,000 38,598,000    
MSRs 230,225,000 147,571,000    
Derivative assets 296,848,000 165,008,000    
Measured at fair value on a non-recurring basis:        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Individually assessed loans - foreclosure probable and collateral-dependent 69,019,000      
Other real estate owned 9,900,000      
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Individually assessed loans - foreclosure probable and collateral-dependent 90,200,000      
Level 3 | Portion at Other than Fair Value Measurement        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Individually assessed loans - foreclosure probable and collateral-dependent 21,200,000      
Level 3 | Measured at fair value on a recurring basis:        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage loans held-for-sale 48,655,000 0    
Loans held-for-investment 84,165,000 15,891,000    
MSRs 230,225,000 147,571,000    
Derivative assets $ 1,711,000 10,560,000    
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Weighted Average | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 0.1030      
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Weighted Average | Mortgage loans held-for-sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0621      
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Weighted Average | Loans held-for-investment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0626      
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Weighted Average | Mortgage Servicing Rights        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.1030      
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Minimum | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 0.07      
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Minimum | Mortgage Servicing Rights        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.07      
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Maximum | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 0.24      
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Maximum | Mortgage Servicing Rights        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.24      
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Weighted Average | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 0.0662      
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Weighted Average | Loans held-for-investment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0662      
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Weighted Average | Mortgage Servicing Rights        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0662      
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Minimum | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 0      
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Minimum | Mortgage Servicing Rights        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0      
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Maximum | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 1      
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Maximum | Mortgage Servicing Rights        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 1      
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Weighted Average | Mortgage loans held-for-sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0033      
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Weighted Average | Loans held-for-investment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0077      
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Minimum | Mortgage loans held-for-sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0      
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Minimum | Loans held-for-investment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0      
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Maximum | Mortgage loans held-for-sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.12      
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Maximum | Loans held-for-investment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.12      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Weighted Average | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 75      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Minimum | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input | $ / shares 70      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Maximum | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input | $ / shares 200      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Weighted Average | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 343      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Minimum | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input | $ / shares 200      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Maximum | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input | $ / shares 1,000      
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Weighted Average | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives, measurement input 0.8612      
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Minimum | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives, measurement input 0.35      
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Maximum | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives, measurement input 1      
Level 3 | Measured at fair value on a non-recurring basis:        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Individually assessed loans - foreclosure probable and collateral-dependent $ 69,019,000      
Other real estate owned 9,900,000      
Municipal securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 168,655,000 165,594,000    
Municipal securities | Measured at fair value on a recurring basis:        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 168,655,000 165,594,000    
Municipal securities | Level 3 | Measured at fair value on a recurring basis:        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities $ 117,537,000 $ 105,687,000