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Description of Business and Summary of Significant Accounting Policies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
depository_branch
Accounting Policies [Abstract]  
Percentage of capital stock of the Bank held 100.00%
Number of depository branches | depository_branch 15
Cash and Cash Equivalents  
Cash reserves required by the Board of Governors of the Federal Reserve for depository institutions (in dollars) | $ $ 0.0
Premises  
Premises, furniture and equipment  
Estimated useful life (in years) 40 years
Furniture, fixtures and equipment  
Premises, furniture and equipment  
Estimated useful life (in years) 7 years
Computer and telecommunication  
Premises, furniture and equipment  
Estimated useful life (in years) 3 years
Core Deposits | Minimum  
Premises, furniture and equipment  
Weighted average useful life (in years) 6 years
Core Deposits | Maximum  
Premises, furniture and equipment  
Weighted average useful life (in years) 10 years