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Deposits - total deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deposits [Abstract]    
Savings accounts $ 14,224,271 $ 14,602,411
NOW, money market and other interest bearing demand deposits 26,507,637 25,094,316
Total savings, NOW, money market and other interest bearing demand deposits 40,731,908 39,696,727
Certificates of deposit:    
Under $250,000 5,383,331 5,443,062
$250,000 and over 3,629,551 3,058,830
Total certificates of deposit 9,012,882 8,501,892
Total interest bearing deposits 49,744,790 48,198,619
Non-interest bearing deposits 15,139,555 15,419,624
Total deposits $ 64,884,345 $ 63,618,243