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Fair Values of Assets and Liabilities (Narrative) (Detail)
 6 Months Ended
Jun. 30, 2023
USD ($)
$ / shares
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities $ 3,492,481,000   $ 3,243,017,000 $ 2,970,121,000    
Loans held-for-investment 200,447,000     122,757,000    
MSRs 200,692,000 $ 224,470,000 230,225,000 212,664,000 $ 199,146,000 $ 147,571,000
Individually assessed loans - foreclosure probable and collateral-dependent 73,804,000     85,557,000    
Estimate of Fair Value Measurement            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 3,492,481,000   3,243,017,000 2,970,121,000    
Remaining contractual principal balance outstanding, mortgage loans held-for-sale 345,700,000   308,900,000 510,700,000    
Remaining contractual principal balance outstanding, mortgage loans held-for-investment 196,600,000   184,000,000 125,100,000    
Non-performing            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Mortgage loans held-for-sale classified as nonaccrual 582,000,000   5,800,000 6,000,000    
Mortgage loans held-for-sale classified greater than 90 days past due and still accruing $ 29,600,000   44,000,000 55,600,000    
Weighted Average | Loans held-for-investment            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Life of loans 6 years 2 months 12 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 $ 338,728,000   299,935,000 513,232,000    
Loans held-for-investment 193,953,000   179,932,000 122,757,000    
MSRs 200,692,000   230,225,000 212,664,000    
Derivative assets 294,748,000   296,848,000 183,925,000    
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 73,804,000          
Other real estate owned 11,586,000          
Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Individually assessed loans - foreclosure probable and collateral-dependent 73,800,000          
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 0          
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 29,406,000   48,655,000 88,963,000    
Loans held-for-investment 61,123,000   84,165,000 84,798,000    
MSRs 200,692,000   230,225,000 212,664,000    
Derivative assets $ 3,487,000   1,711,000 6,649,000    
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 0.1050          
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 0.0650          
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 0.0657          
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 0.1050          
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 0.02          
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 0.02          
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 0.21          
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 0.21          
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 0.0701          
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 0.0701          
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 0.0701          
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 0.0042          
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 0.0089          
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 0.13          
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 0.14          
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 77          
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 405          
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 0.8316          
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 0.13          
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 $ 73,804,000          
Other real estate owned 11,586,000          
Municipal securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 167,411,000   168,655,000 166,705,000    
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 167,411,000   168,655,000 166,705,000    
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 $ 114,155,000   $ 117,537,000 $ 113,485,000