Cash and Due from Banks (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)
Cash and Due from Banks [Abstract]
Minimum average daily balance	$ 710,000
Compensating Balances [Line Items]
Required balance	500,000
Compensating balance, initial margin on interest rate swap	100,000
Compensating balance, fair value exposure on interest rate swap	300,000
Federal Reserve Bank
Compensating Balances [Line Items]
Required balance	$ 0