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Investment Securities - Summary of Credit Quality Indicators of Held-to-maturity Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities $ 689,486 $ 533,108
AA+    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 689,486 533,108
U.S. Treasury securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 24,840 49,639
U.S. Treasury securities | AA+    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 24,840 49,639
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 244,916 271,105
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | AA+    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 244,916 271,105
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 419,730 212,364
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | AA+    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities $ 419,730 $ 212,364