v3.26.3
Fair Value of Assets and Liabilities - Narrative (Details)
 9 Months Ended
Sep. 30, 2026
USD ($)
$ / shares
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities, at fair value $ 7,569,498,000   $ 6,236,263,000 $ 5,274,124,000    
Loans held-for-investment 145,750,000     129,593,000    
MSRs 238,485,000 $ 201,903,000 195,023,000 190,938,000 $ 193,061,000 $ 203,788,000
Individually measured 125,970,000     124,966,000    
Non-performing            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Mortgage loans held-for-sale classified as nonaccrual 1,200,000   700,000 200,000    
Mortgage loans held-for-sale classified greater than 90 days past due and still accruing 52,100,000   53,100,000 53,800,000    
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 7,569,498,000   6,236,263,000 5,274,124,000    
Remaining contractual principal balance outstanding, mortgage loans held-for-sale 318,700,000   343,300,000 339,100,000    
Remaining contractual principal balance outstanding, mortgage loans held-for-investment $ 145,900,000   148,100,000 126,400,000    
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 0.1000          
Weighted Average | Loans held-for- investment            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Life of loans 5 years 3 months 18 days          
Municipal            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities, at fair value $ 164,324,000   162,166,000 194,244,000    
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 307,748,000   340,745,000 333,883,000    
Loans held-for-investment 145,750,000   151,590,000 129,593,000    
MSRs 238,485,000   195,023,000 190,938,000    
Derivative asset 205,591,000   179,667,000 208,957,000    
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 164,324,000   162,166,000 194,244,000    
Measured at fair value on a non-recurring basis:            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Individually measured 125,970,000          
Other real estate owned 16,404,000          
Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Individually measured 126,000,000.0          
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 52,726,000   53,814,000 54,726,000    
Loans held-for-investment 50,523,000   56,200,000 49,220,000    
MSRs 238,485,000   195,023,000 190,938,000    
Derivative asset $ 816,000   3,416,000 7,149,000    
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 0.0982          
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 0.0756          
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 375          
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 0.8789          
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 0.0641          
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 0.0066          
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 0.0646          
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 0.0178          
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 0.0756          
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 0.0982          
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 0.0756          
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 0.0900          
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 0.0578          
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 0.1955          
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 0.0000          
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 0.0000          
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 0.0900          
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 0.0578          
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 0.1300          
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 1.0000          
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 95          
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 0.2973          
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 0.3798          
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 0.1300          
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 1.0000          
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 $ 119,676,000   $ 99,603,000 $ 129,794,000    
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 125,970,000          
Other real estate owned $ 16,404,000