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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]        
Goodwill   $ 855,453,000 $ 855,453,000  
Percentage of fair value of reporting unit in excess of net book value 17.00%      
Goodwill impairment charges   $ 0 $ 0 $ 0
Estimated amortization expense succeeding period   5 years    
Core Deposit Intangibles [Member]        
Finite-Lived Intangible Assets [Line Items]        
Weighted-average remaining life   9 years    
Other Identifiable Intangibles [Member]        
Finite-Lived Intangible Assets [Line Items]        
Weighted-average remaining life   14 years