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Goodwill and Other Intangible Assets (Carrying Value of Intangible Assets Subject to Amortization) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Purchase Value $ 285,807 $ 295,807
Accumulated Amortization 215,581 208,915
Carrying Value 70,226 86,892
Core Deposit Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Purchase Value 235,845 235,845
Accumulated Amortization 188,135 173,830
Carrying Value 47,710 62,015
Credit Card and Trust Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Purchase Value 49,962 49,962
Accumulated Amortization 27,446 25,085
Carrying Value $ 22,516 24,877
Merchant Processing Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Purchase Value   10,000
Accumulated Amortization   $ 10,000