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Deposits (Tables)
 6 Months Ended
Jun. 30, 2023
Deposits [Abstract]  
Summary of Deposits
The following table is a summary of deposits as of the dates shown: 
(Dollars in thousands)June 30,
2023		December 31,
2022		June 30,
2022
Balance:
Non-interest-bearing$10,604,915 $12,668,160 $13,855,844 
NOW and interest-bearing demand deposits5,814,836 5,591,986 5,918,908 
Wealth management deposits1,417,984 2,463,833 3,182,407 
Money market14,523,124 12,886,795 12,273,350 
Savings5,321,578 4,556,635 3,686,596 
Time certificates of deposit6,356,270 4,735,135 3,676,221 
Total deposits$44,038,707 $42,902,544 $42,593,326 
Mix:
Non-interest-bearing24 %30 %33 %
NOW and interest-bearing demand deposits13 13 13 
Wealth management deposits3 5 7 
Money market33 30 29 
Savings12 11 9 
Time certificates of deposit15 11 9 
Total deposits100 %100 %100 %