v3.26.1
Allowance for Credit Losses - Schedule of Held-to-Maturity Debt Securities by Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
Amortized Cost $ 3,270,464 $ 3,344,165 $ 3,564,936
Less: Allowance for credit losses (257) (260) (446)
Held-to-maturity securities, net of allowance for credit losses 3,270,207 3,343,905 3,564,490
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 178,541    
Amortized Cost 313,541 313,541 313,539
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 178,541    
Amortized Cost 313,541    
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 4,092    
2022 1,025    
Prior 134,000    
Amortized Cost 139,117 $ 144,192 $ 158,307
Municipal | 1-4 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 4,092    
2022 1,025    
Prior 132,113    
Amortized Cost 137,230    
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 252,587    
2022 465,970    
Prior 2,070,216    
Amortized Cost 2,788,773    
Mortgage-backed securities | 1-4 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 252,587    
2022 465,970    
Prior 2,070,216    
Amortized Cost 2,788,773    
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 4,974    
Prior 24,059    
Amortized Cost 29,033    
Corporate notes | 1-4 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023    
2022 4,974    
Prior 24,059    
Amortized Cost 29,033    
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