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Investment Securities - Summary of Credit Quality Indicators of Held-to-maturity Investment Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities $ 554,686 $ 585,052
AA+    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 554,686  
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 49,487 49,338
U.S. Treasury Securities | AA+    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 49,487  
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 279,941 299,337
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 279,941  
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 225,258 236,377
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 $ 225,258  
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