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Fair Value Measurements - Assets and Liabilities Carried at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Investment securities:    
Loans held for sale   $ 3,800
Asset-backed securities    
Investment securities:    
Available-for-sale securities $ 353,394  
Recurring    
Investment securities:    
Loans held for sale   3,849
Total assets 2,467,843 2,036,651
Recurring | Corporate bonds    
Investment securities:    
Available-for-sale securities   9,890
Recurring | Agency bond securities    
Investment securities:    
Available-for-sale securities 156,975 202,496
Recurring | Agency mortgage-backed securities    
Investment securities:    
Available-for-sale securities 1,934,918 1,797,573
Recurring | Municipal bonds    
Investment securities:    
Available-for-sale securities 22,556 22,843
Recurring | Asset-backed securities    
Investment securities:    
Available-for-sale securities 353,394  
Level 1 | Recurring    
Investment securities:    
Loans held for sale   0
Total assets 0 0
Level 1 | Recurring | Corporate bonds    
Investment securities:    
Available-for-sale securities   0
Level 1 | Recurring | Agency bond securities    
Investment securities:    
Available-for-sale securities 0 0
Level 1 | Recurring | Agency mortgage-backed securities    
Investment securities:    
Available-for-sale securities 0 0
Level 1 | Recurring | Municipal bonds    
Investment securities:    
Available-for-sale securities 0 0
Level 1 | Recurring | Asset-backed securities    
Investment securities:    
Available-for-sale securities 0  
Level 2 | Recurring    
Investment securities:    
Loans held for sale   0
Total assets 2,467,843 2,032,802
Level 2 | Recurring | Corporate bonds    
Investment securities:    
Available-for-sale securities   9,890
Level 2 | Recurring | Agency bond securities    
Investment securities:    
Available-for-sale securities 156,975 202,496
Level 2 | Recurring | Agency mortgage-backed securities    
Investment securities:    
Available-for-sale securities 1,934,918 1,797,573
Level 2 | Recurring | Municipal bonds    
Investment securities:    
Available-for-sale securities 22,556 22,843
Level 2 | Recurring | Asset-backed securities    
Investment securities:    
Available-for-sale securities 353,394  
Level 3 | Recurring    
Investment securities:    
Loans held for sale   3,849
Total assets 0 3,849
Level 3 | Recurring | Corporate bonds    
Investment securities:    
Available-for-sale securities   0
Level 3 | Recurring | Agency bond securities    
Investment securities:    
Available-for-sale securities 0 0
Level 3 | Recurring | Agency mortgage-backed securities    
Investment securities:    
Available-for-sale securities 0 0
Level 3 | Recurring | Municipal bonds    
Investment securities:    
Available-for-sale securities 0 $ 0
Level 3 | Recurring | Asset-backed securities    
Investment securities:    
Available-for-sale securities $ 0