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Fair Values of Assets and Liabilities - Narrative (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities $ 6,236,263,000 $ 4,141,482,000    
Loans held-for-investment 151,590,000 158,795,000    
MSRs 195,023,000 203,788,000 $ 192,456,000 $ 230,225,000
Individually assessed loans - foreclosure probable and collateral-dependent 137,209,000 119,325,000    
Estimate of Fair Value Measurement        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 6,236,263,000 4,141,482,000    
Remaining contractual principal balance outstanding, mortgage loans held-for-sale 343,300,000 335,900,000    
Remaining contractual principal balance outstanding, mortgage loans held-for-investment 148,100,000 157,800,000    
Non-performing        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage loans held-for-sale classified as nonaccrual 700,000 4,000,000.0    
Mortgage loans held-for-sale classified greater than 90 days past due and still accruing $ 53,100,000 59,300,000    
Weighted Average | Loans held-for-investment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Life of loans (in years) 5 years 10 months 24 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 (as a percent) 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 $ 340,745,000 331,261,000    
Loans held-for-investment 151,590,000 158,795,000    
MSRs 195,023,000 203,788,000    
Derivative assets 179,667,000 200,027,000    
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 137,209,000      
Other real estate owned 20,839,000      
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Individually assessed loans - foreclosure probable and collateral-dependent 137,200,000      
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 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 53,814,000 60,399,000    
Loans held-for-investment 56,200,000 34,896,000    
MSRs 195,023,000 203,788,000    
Derivative assets $ 3,416,000 1,950,000    
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 0.0983      
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 (as a percent) 0.0502      
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 (as a percent) 0.0512      
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 (as a percent) 0.0983      
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 0.09      
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 (as a percent) 0.09      
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 0.15      
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 (as a percent) 0.15      
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 (as a percent) 0.0092      
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 (as a percent) 0.0151      
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 (as a percent) 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 (as a percent) 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 (as a percent) 0.35      
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 (as a percent) 0.22      
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 0.0992      
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 (as a percent) 0.0992      
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 (as a percent) 0.0992      
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 0.06      
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 (as a percent) 0.06      
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 0.86      
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 (as a percent) 0.86      
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 76      
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 382      
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 0.8302      
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 0.10      
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 $ 137,209,000      
Other real estate owned 20,839,000      
Municipal securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 162,166,000 184,593,000    
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 162,166,000 184,593,000    
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 $ 99,603,000 $ 121,607,000