v3.26.1
Fair Value of Assets and Liabilities - Narrative (Details)
 3 Months Ended
Mar. 31, 2026
USD ($)
$ / shares
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities, at fair value $ 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 measured 132,937,000   121,269,000  
Non-performing        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage loans held-for-sale classified as nonaccrual 900,000 700,000 2,800,000  
Mortgage loans held-for-sale classified greater than 90 days past due and still accruing 51,900,000 53,100,000 56,200,000  
Estimate of Fair Value Measurement        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities, at fair value 7,244,282,000 6,236,263,000 4,220,305,000  
Remaining contractual principal balance outstanding, mortgage loans held-for-sale 387,900,000 343,300,000 319,600,000  
Remaining contractual principal balance outstanding, mortgage loans held-for-investment $ 146,100,000 148,100,000 126,500,000  
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      
Weighted Average | Loans held-for- investment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Life of loans 5 years 2 months 12 days      
Municipal        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities, at fair value $ 174,259,000 162,166,000 188,149,000  
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 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 asset 152,851,000 179,667,000 204,257,000  
Measured at fair value on a recurring basis: | Municipal        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities, at fair value 174,259,000 162,166,000 188,149,000  
Measured at fair value on a non-recurring basis:        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Individually measured 132,937,000      
Other real estate owned 17,439,000      
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Individually measured 132,900,000      
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 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 asset $ 4,525,000 3,416,000 5,493,000  
Level 3 | Measured at fair value on a recurring basis: | Weighted Average | Measurement Input, Discount Rate | 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: | Weighted Average | Constant prepayment rate (CPR) - current loans | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 0.1005      
Level 3 | Measured at fair value on a recurring basis: | Weighted Average | Cost of servicing | 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: | Weighted Average | Cost of servicing - delinquent | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 399      
Level 3 | Measured at fair value on a recurring basis: | Weighted Average | Pull-through rate | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives, measurement input 0.8731      
Level 3 | Measured at fair value on a recurring basis: | Weighted Average | Mortgage loans held-for-sale | Measurement Input, Discount Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0563      
Level 3 | Measured at fair value on a recurring basis: | Weighted Average | Mortgage loans held-for-sale | Credit discount        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0052      
Level 3 | Measured at fair value on a recurring basis: | Weighted Average | Loans held-for- investment | Measurement Input, Discount Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0613      
Level 3 | Measured at fair value on a recurring basis: | Weighted Average | Loans held-for- investment | Credit discount        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0165      
Level 3 | Measured at fair value on a recurring basis: | Weighted Average | Loans held-for- investment | Constant prepayment rate (CPR) - current loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0926      
Level 3 | Measured at fair value on a recurring basis: | Weighted Average | Mortgage servicing rights | Measurement Input, Discount Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.0983      
Level 3 | Measured at fair value on a recurring basis: | Weighted Average | Mortgage servicing rights | Constant prepayment rate (CPR) - current loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.1005      
Level 3 | Measured at fair value on a recurring basis: | Minimum | Measurement Input, Discount Rate | 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: | Minimum | Constant prepayment rate (CPR) - current loans | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 0.03      
Level 3 | Measured at fair value on a recurring basis: | Minimum | Cost of servicing | 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: | Minimum | Cost of servicing - delinquent | 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: | Minimum | Pull-through rate | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivatives, measurement input 0.12      
Level 3 | Measured at fair value on a recurring basis: | Minimum | Mortgage loans held-for-sale | Credit discount        
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: | Minimum | Loans held-for- investment | Credit discount        
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: | Minimum | Mortgage servicing rights | Measurement Input, Discount Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.09      
Level 3 | Measured at fair value on a recurring basis: | Minimum | Mortgage servicing rights | Constant prepayment rate (CPR) - current loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.03      
Level 3 | Measured at fair value on a recurring basis: | Maximum | Measurement Input, Discount Rate | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 0.12      
Level 3 | Measured at fair value on a recurring basis: | Maximum | Constant prepayment rate (CPR) - current loans | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input 0.84      
Level 3 | Measured at fair value on a recurring basis: | Maximum | Cost of servicing | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
MSRs, measurement input | $ / shares 90      
Level 3 | Measured at fair value on a recurring basis: | Maximum | Cost of servicing - delinquent | 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: | Maximum | Pull-through rate | 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 recurring basis: | Maximum | Mortgage loans held-for-sale | Credit discount        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.37      
Level 3 | Measured at fair value on a recurring basis: | Maximum | Loans held-for- investment | Credit discount        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.55      
Level 3 | Measured at fair value on a recurring basis: | Maximum | Mortgage servicing rights | Measurement Input, Discount Rate        
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: | Maximum | Mortgage servicing rights | Constant prepayment rate (CPR) - current loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rate 0.84      
Level 3 | Measured at fair value on a recurring basis: | Municipal        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities, at fair value $ 114,185,000 $ 99,603,000 $ 121,844,000  
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 measured 132,937,000      
Other real estate owned $ 17,439,000