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Fair Values of Assets and Liabilities - Schedule of Valuation Techniques and Significant Unobservable Inputs Used to Measure Both Recurring and Non Recurring (Details)
Dec. 31, 2025
USD ($)
year
$ / shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [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    
Municipal securities        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Available-for-sale securities 162,166,000 184,593,000    
Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Individually assessed loans - foreclosure probable and collateral-dependent 137,200,000      
Measured at fair value on a recurring basis:        
Fair Value Measurement Inputs and Valuation Techniques [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 recurring basis: | Municipal securities        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Available-for-sale securities 162,166,000 184,593,000    
Measured at fair value on a recurring basis: | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [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    
Measured at fair value on a recurring basis: | Level 3 | Municipal securities        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Available-for-sale securities $ 99,603,000 $ 121,607,000    
Measured at fair value on a recurring basis: | Discount rate | Level 3 | Discounted cash flows        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage loans held-for-sale, measurement input 0.0502      
Measured at fair value on a recurring basis: | Discount rate | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input 0.0502      
MSRs, measurement input 0.09      
Measured at fair value on a recurring basis: | Discount rate | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input 0.0600      
MSRs, measurement input 0.15      
Measured at fair value on a recurring basis: | Discount rate | Level 3 | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage loans held-for-sale, measurement input 0.0502      
Loans held-for-investment, measurement input 0.0512      
MSRs, measurement input 0.0983      
Measured at fair value on a recurring basis: | Credit discount | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage loans held-for-sale, measurement input 0      
Loans held-for-investment, measurement input 0      
Measured at fair value on a recurring basis: | Credit discount | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage loans held-for-sale, measurement input 0.35      
Loans held-for-investment, measurement input 0.22      
Measured at fair value on a recurring basis: | Credit discount | Level 3 | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage loans held-for-sale, measurement input 0.0092      
Loans held-for-investment, measurement input 0.0151      
Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Level 3 | Discounted cash flows        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input 0.0992      
Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input 0.06      
Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input 0.86      
Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Level 3 | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input 0.0992      
MSRs, measurement input 0.0992      
Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input | year 1.4      
Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input | year 12      
Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Level 3 | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input | year 5.9      
Measured at fair value on a recurring basis: | Cost of servicing | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input | $ / shares 70      
Measured at fair value on a recurring basis: | Cost of servicing | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input | $ / shares 200      
Measured at fair value on a recurring basis: | Cost of servicing | Level 3 | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input 76      
Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input | $ / shares 200      
Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input | $ / shares 1,000      
Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Level 3 | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input 382      
Measured at fair value on a recurring basis: | Pull-through rate | Level 3 | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivatives, measurement input 0.10      
Measured at fair value on a recurring basis: | Pull-through rate | Level 3 | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivatives, measurement input 1      
Measured at fair value on a recurring basis: | Pull-through rate | Level 3 | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivatives, measurement input 0.8302      
Measured at fair value on a non-recurring basis:        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Individually assessed loans - foreclosure probable and collateral-dependent $ 137,209,000      
Other real estate owned 20,839,000      
Measured at fair value on a non-recurring basis: | Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Individually assessed loans - foreclosure probable and collateral-dependent 137,209,000      
Other real estate owned $ 20,839,000      
Measured at fair value on a non-recurring basis: | Appraisal adjustment - cost of sale | Level 3 | Appraisal value        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Impaired loans - collateral based, measurement input 0.10      
Other real estate owned, measurement input 0.10      
Measured at fair value on a non-recurring basis: | Appraisal adjustment - cost of sale | Level 3 | Appraisal value | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Impaired loans - collateral based, measurement input 0.1000      
Other real estate owned, measurement input 0.1000