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Fair Value Accounting (Schedule of Carrying and Estimated Fair Values of Financial Instruments Carried on Balance Sheet) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Financial assets    
Investment securities available for sale $ 9,621,175 $ 9,678,103
Loans held for sale 514,450 391,502
Financial liabilities    
Non-interest-bearing deposits 13,565,602 15,639,899
Total deposits 50,080,392 48,871,559
Federal funds purchased and securities sold under repurchase agreements 83,384 146,588
Long-term debt 4,021,411 4,109,597
Level 1    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,054,151 1,977,780
Trading securities 0 0
Investment securities available for sale 473,890 471,813
Loans held for sale 0 0
Other investments 0 0
Mutual funds and mutual funds held in rabbi trusts 51,147 42,659
Loans, net 0 0
SBA loans servicing asset 0 0
FRB and FHLB stock 0 0
Derivative assets 0 0
Financial liabilities    
Non-interest-bearing deposits 0 0
Non-time interest-bearing deposits 0 0
Time deposits 0 0
Total deposits 0 0
Federal funds purchased and securities sold under repurchase agreements 83,384 146,588
Securities sold short 1,461 3,370
Short-term FHLB advances   0
Long-term debt 0 0
Mutual funds held in rabbi trusts 36,380 27,944
Derivative liabilities 0 0
Level 2    
Financial assets    
Total cash, cash equivalents, and restricted cash 0 0
Trading securities 21,467 8,295
Investment securities available for sale 9,147,285 9,206,290
Loans held for sale 62,616 51,136
Other investments 0 0
Mutual funds and mutual funds held in rabbi trusts 0 0
Loans, net 0 0
SBA loans servicing asset 0 0
FRB and FHLB stock 273,951 308,321
Derivative assets 119,659 89,815
Financial liabilities    
Non-interest-bearing deposits 13,565,602 15,639,899
Non-time interest-bearing deposits 26,929,264 26,936,635
Time deposits 9,596,056 6,260,315
Total deposits 50,090,922 48,836,849
Federal funds purchased and securities sold under repurchase agreements 0 0
Securities sold short 0 0
Short-term FHLB advances   600,014
Long-term debt 3,949,290 4,120,113
Mutual funds held in rabbi trusts 0 0
Derivative liabilities 365,390 339,227
Level 3    
Financial assets    
Total cash, cash equivalents, and restricted cash 0 0
Trading securities 0 0
Investment securities available for sale 0 0
Loans held for sale 451,834 339,949
Other investments 11,770 11,172
Mutual funds and mutual funds held in rabbi trusts 0 0
Loans, net 41,977,636 42,192,295
SBA loans servicing asset 2,234 2,354
FRB and FHLB stock 0
Derivative assets 0 0
Financial liabilities    
Non-interest-bearing deposits 0 0
Non-time interest-bearing deposits 0 0
Time deposits 0 0
Total deposits 0 0
Federal funds purchased and securities sold under repurchase agreements 0 0
Securities sold short 0 0
Short-term FHLB advances   0
Long-term debt 0 0
Mutual funds held in rabbi trusts 0 0
Derivative liabilities 3,937 3,453
Carrying Value    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,054,151 1,977,780
Trading securities 21,467 8,295
Investment securities available for sale 9,621,175 9,678,103
Loans held for sale   391,502
Other investments 11,770 11,172
Mutual funds and mutual funds held in rabbi trusts 51,147 42,659
Loans, net 43,882,299 43,272,929
SBA loans servicing asset 2,234 2,354
FRB and FHLB stock 273,951 308,321
Derivative assets 119,659 89,815
Financial liabilities    
Non-interest-bearing deposits 13,565,602 15,639,899
Non-time interest-bearing deposits 26,929,264 26,936,635
Time deposits 9,585,526 6,295,025
Total deposits 50,080,392 48,871,559
Federal funds purchased and securities sold under repurchase agreements 83,384 146,588
Securities sold short 1,461 3,370
Short-term FHLB advances   600,014
Long-term debt 4,021,411 4,109,597
Mutual funds held in rabbi trusts 36,380 27,944
Derivative liabilities 369,327 342,680
Fair Value    
Financial assets    
Total cash, cash equivalents, and restricted cash 2,054,151 1,977,780
Trading securities 21,467 8,295
Investment securities available for sale 9,621,175 9,678,103
Loans held for sale 514,450 391,085
Other investments 11,770 11,172
Mutual funds and mutual funds held in rabbi trusts 51,147 42,659
Loans, net 41,977,636 42,192,295
SBA loans servicing asset 2,234 2,354
FRB and FHLB stock 273,951 308,321
Derivative assets 119,659 89,815
Financial liabilities    
Non-interest-bearing deposits 13,565,602 15,639,899
Non-time interest-bearing deposits 26,929,264 26,936,635
Time deposits 9,596,056 6,260,315
Total deposits 50,090,922 48,836,849
Federal funds purchased and securities sold under repurchase agreements 83,384 146,588
Securities sold short 1,461 3,370
Short-term FHLB advances   600,014
Long-term debt 3,949,290 4,120,113
Mutual funds held in rabbi trusts 36,380 27,944
Derivative liabilities $ 369,327 $ 342,680