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Investment Securities - Summary of Credit Quality Indicators of Held-to-maturity Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities $ 538,157 $ 585,052
AA+    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 538,157  
AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities   585,052
U.S. Treasury securities    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 49,563 49,338
U.S. Treasury securities | AA+    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 49,563  
U.S. Treasury securities | AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities   49,338
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 270,518 299,337
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 270,518  
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises | AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities   299,337
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 218,076 236,377
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 $ 218,076  
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises | AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities   $ 236,377