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Deposits (Tables)
 9 Months Ended
Sep. 30, 2022
Deposits [Abstract]  
Summary of Deposits
The following table is a summary of deposits as of the dates shown: 
(Dollars in thousands)September 30,
2022		December 31,
2021		September 30,
2021
Balance:
Non-interest-bearing$13,529,277 $14,179,980 $13,255,417 
NOW and interest-bearing demand deposits5,676,122 4,646,944 4,255,940 
Wealth management deposits2,988,195 2,612,759 2,300,818 
Money market12,538,489 12,840,432 12,148,541 
Savings3,988,790 3,846,681 3,861,296 
Time certificates of deposit4,076,318 3,968,789 4,130,546 
Total deposits$42,797,191 $42,095,585 $39,952,558 
Mix:
Non-interest-bearing32 %34 %33 %
NOW and interest-bearing demand deposits13 11 11 
Wealth management deposits7 6 6 
Money market29 31 30 
Savings9 9 10 
Time certificates of deposit10 9 10 
Total deposits100 %100 %100 %