XML 44 R37.htm IDEA: XBRL DOCUMENT v3.25.2
Securities - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Security
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Segment
Security
Jun. 30, 2024
USD ($)
Dec. 31, 2024
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 0.80%   0.80%    
Securities in Unrealized Loss Positions Qualitative Disclosure Number of Positions Greater Than or Equal to One Year | Security 865   865   949
Gain (loss) on sale of investment securities $ 0 $ (9,700,000) $ 0 $ (9,400,000)  
Available for Sale Securities, Amortized Cost Basis 343,765,000   343,765,000   $ 339,016,000
Debt Securities, Available-for-Sale 342,108,000   342,108,000   336,960,000
Collateralized Securities [Member]          
Schedule Of Held To Maturity Securities [Line Items]          
Available for Sale Securities, Amortized Cost Basis 7,750,000,000   7,750,000,000   10,260,000,000
Debt Securities, Available-for-Sale $ 6,880,000,000   $ 6,880,000,000   $ 8,910,000,000
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%