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Summary of Significant Accounting Policies - Intangible assets, Transfer of financial assets (Details) - USD ($)
12 Months Ended
Apr. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Intangible Assets      
Impairment Charges $ 0 $ 0  
Transfer of Financial Assets      
Term of fixed-rate mortgage loans   30 years  
Accruals for uncertain tax positions   $ 0 $ 0
Minimum      
Intangible Assets      
Estimated useful lives of intangibles   2 years  
Maximum      
Intangible Assets      
Estimated useful lives of intangibles   15 years  
Core deposit intangibles | Minimum      
Intangible Assets      
Estimated useful lives of intangibles   7 years  
Core deposit intangibles | Maximum      
Intangible Assets      
Estimated useful lives of intangibles   13 years  
Noncompete intangibles | Minimum      
Intangible Assets      
Estimated useful lives of intangibles   2 years  
Noncompete intangibles | Maximum      
Intangible Assets      
Estimated useful lives of intangibles   3 years  
Client list intangibles      
Intangible Assets      
Estimated useful lives of intangibles   15 years