v3.26.3
Allowance for Credit Losses - Schedule of Held-to-Maturity Debt Securities by Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
Amortized Cost $ 3,120,716 $ 3,344,165 $ 3,438,801
Less: Allowance for credit losses (213) (260) (395)
Held-to-maturity securities, net of allowance for credit losses 3,120,503 3,343,905 3,438,406
U.S. government agencies      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 135,000    
Prior 178,542    
Amortized Cost 313,542 313,541 313,540
U.S. government agencies | 1-4 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 135,000    
Prior 178,542    
Amortized Cost 313,542    
U.S. government agencies | 5-7 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
U.S. government agencies | 8-10 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
Municipal      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 3,583    
2022 1,022    
Prior 128,803    
Amortized Cost 133,408 $ 144,192 $ 155,770
Municipal | 1-4 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 3,583    
2022 1,022    
Prior 126,916    
Amortized Cost 131,521    
Municipal | 5-7 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 1,887    
Amortized Cost 1,887    
Municipal | 8-10 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
Mortgage-backed securities      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 220,721    
2022 439,347    
Prior 2,005,723    
Amortized Cost 2,665,791    
Mortgage-backed securities | 1-4 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 220,721    
2022 439,347    
Prior 2,005,723    
Amortized Cost 2,665,791    
Mortgage-backed securities | 5-7 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
Mortgage-backed securities | 8-10 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
Corporate notes      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 4,975    
Prior 3,000    
Amortized Cost 7,975    
Corporate notes | 1-4 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 4,975    
Prior 3,000    
Amortized Cost 7,975    
Corporate notes | 5-7 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
Corporate notes | 8-10 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost $ 0