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Premises and Equipment (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
 December 31,
 20212020
 (in millions)
Bank premises$91.6 $92.0 
Land and improvements32.4 33.0 
Furniture, fixtures, and equipment99.6 68.2 
Leasehold improvements41.5 29.7 
Construction in progress42.7 17.4 
Total307.8 240.3 
Accumulated depreciation and amortization(125.9)(106.2)
Premises and equipment, net$181.9 $134.1