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Securities - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Security
shares
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Security
Segment
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Security
Schedule Of Held To Maturity Securities [Line Items]          
Number of Investment Securities Segments | Segment     2    
Credit losses     $ 0    
Municipal securities percentage of securities portfolio 1.00%   1.00%    
Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions Greater Than or Equal to One Year | Security 1,100   1,100   941
Gain (loss) on sale of investment securities $ (9,700,000) $ 0 $ (9,400,000) $ 0  
Available for Sale Securities, Amortized Cost Basis 320,654,000   320,654,000   $ 440,358,000
Debt Securities, Available-for-Sale 318,647,000   318,647,000   438,588,000
Collateralized Securities [Member]          
Schedule Of Held To Maturity Securities [Line Items]          
Available for Sale Securities, Amortized Cost Basis 10,420,000,000   10,420,000,000   11,340,000,000
Debt Securities, Available-for-Sale 9,120,000,000   $ 9,120,000,000   $ 10,090,000,000.00
Securities Concentration Risk [Member] | Stockholders' Equity, Total [Member] | Other Than U.S. Government and Agencies [Member]          
Schedule Of Held To Maturity Securities [Line Items]          
Concentration Risk, Percentage     10.00%   10.00%
Visa Stock Exchange [Member]          
Schedule Of Held To Maturity Securities [Line Items]          
Conversion of stock, description     During the second quarter of 2024, the Company tendered all of its shares of Visa, Inc. (“Visa”) Class B-1 common stock in exchange for a combination of Visa Class B-2 common stock and Visa Class C common stock, pursuant to the terms and subject to the conditions of the public offering of Visa to exchange its Class B-1 common stock for a combination of shares of its Class B-2 common stock and Class C common stock, which expired on May 3, 2024.    
Gain on stock exchange $ 20,600,000        
Visa Stock Exchange [Member] | Class B-2 Common Stock [Member]          
Schedule Of Held To Maturity Securities [Line Items]          
Conversion of stock, shares converted | shares 48,492        
Cost basis $ 0        
Visa Stock Exchange [Member] | Class C Common Stock [Member]          
Schedule Of Held To Maturity Securities [Line Items]          
Conversion of stock, shares converted | shares 19,245        
Number of shares sold | shares 6,415