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Acquisitions Acquisitions - Consideration Paid and Allocation of Purchase Price to Net Assets Acquired (Details) - USD ($)
Jun. 16, 2017
Mar. 01, 2016
Feb. 01, 2015
Dec. 31, 2017
Dec. 31, 2016
Equity consideration:          
Common stock issued (in shares)   860,470      
Non-equity consideration:          
Cash paid to redeem common stock   $ 74,100,000 $ 75,000,000    
Allocation of total consideration paid:          
Goodwill       $ 1,808,001,781 $ 551,593,796
Bank of North Carolina [Member]          
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 estimated identifiable intangible assets 601,807,000        
Goodwill 1,256,455,000        
Total consideration paid $ 1,858,262,000        
Bank of North Carolina [Member] | Common Stock [Member]          
Equity consideration:          
Common stock issued (in shares) 27,687,100        
Total equity consideration $ 1,858,133,000