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Acquisitions - Consideration Paid and Allocation of Purchase Price to Net Assets Acquired (Details) - USD ($)
Jun. 16, 2017
Mar. 31, 2018
Dec. 31, 2017
Allocation of total consideration paid:      
Goodwill   $ 1,808,300,000 $ 1,808,002,000
BNC Bancorp      
Equity consideration:      
Total equity consideration $ 1,858,133,000    
Non-equity consideration:      
Cash paid to redeem common stock 129,000    
Allocation of total consideration paid:      
Fair value of net assets assumed including identifiable intangible assets 601,509,000    
Goodwill 1,256,753,000    
Total consideration paid $ 1,858,262,000    
BNC Bancorp | Common Stock      
Equity consideration:      
Common stock issued (in shares) 27,687,100    
Total equity consideration $ 1,858,133,000