v3.26.1
Fair Value of Assets and Liabilities - Schedule of Valuation Techniques and Significant Unobservable Inputs Used to Measure Both Recurring and Non Recurring (Details)
Mar. 31, 2026
USD ($)
year
$ / shares
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Available-for-sale securities $ 7,244,282,000 $ 6,236,263,000 $ 4,220,305,000  
Loans held-for-investment 150,470,000   126,521,000  
MSRs 195,276,000 195,023,000 196,307,000 $ 203,788,000
Individually assessed loans - foreclosure probable and collateral-dependent 132,937,000   121,269,000  
Municipal securities        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Available-for-sale securities 174,259,000 162,166,000 188,149,000  
Measured at fair value on a recurring basis:        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage loans held-for-sale 383,405,000 340,745,000 316,804,000  
Loans held-for-investment 150,470,000 151,590,000 126,521,000  
MSRs 195,276,000 195,023,000 196,307,000  
Derivative assets 152,851,000 179,667,000 204,257,000  
Measured at fair value on a recurring basis: | Municipal securities        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Available-for-sale securities 174,259,000 162,166,000 188,149,000  
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 132,937,000      
Other real estate owned 17,439,000      
Level 3        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Individually assessed loans - foreclosure probable and collateral-dependent 132,900,000      
Level 3 | Measured at fair value on a recurring basis:        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage loans held-for-sale 52,473,000 53,814,000 56,324,000  
Loans held-for-investment 55,357,000 56,200,000 34,002,000  
MSRs 195,276,000 195,023,000 196,307,000  
Derivative assets $ 4,525,000 3,416,000 5,493,000  
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Discounted cash flows        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage loans held-for-sale, measurement input 0.0563      
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input 0.0563      
MSRs, measurement input 0.09      
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input 0.0567      
MSRs, measurement input 0.12      
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage loans held-for-sale, measurement input 0.0563      
Loans held-for-investment, measurement input 0.0613      
MSRs, measurement input 0.0983      
Level 3 | Measured at fair value on a recurring basis: | Credit discount | 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      
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage loans held-for-sale, measurement input 0.37      
Loans held-for-investment, measurement input 0.55      
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Mortgage loans held-for-sale, measurement input 0.0052      
Loans held-for-investment, measurement input 0.0165      
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Discounted cash flows        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input 0.0926      
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input 0.03      
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input 0.84      
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input 0.0926      
MSRs, measurement input 0.1005      
Level 3 | Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input | year 1.5      
Level 3 | Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input | year 11.7      
Level 3 | Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Loans held-for-investment, measurement input | year 5.2      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input | $ / shares 70      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input | $ / shares 90      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input 76      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input | $ / shares 200      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input | $ / shares 1,000      
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
MSRs, measurement input 399      
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Discounted cash flows | Minimum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivatives, measurement input 0.12      
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Discounted cash flows | Maximum        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivatives, measurement input 1      
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Discounted cash flows | Weighted Average        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivatives, measurement input 0.8731      
Level 3 | Measured at fair value on a recurring basis: | Municipal securities        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Available-for-sale securities $ 114,185,000 $ 99,603,000 $ 121,844,000  
Level 3 | 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 132,937,000      
Other real estate owned $ 17,439,000      
Level 3 | Measured at fair value on a non-recurring basis: | Appraisal adjustment - cost of sale | 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      
Level 3 | Measured at fair value on a non-recurring basis: | Appraisal adjustment - cost of sale | 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