Basis of Presentation (Details) $ in Millions	Jan. 01, 2018 USD ($)
Accounting Policies [Abstract]
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	$ 450

Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

No definition available.

Name:	us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant