Investment Securities - Gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (Parentheticals) (Details 2)	6 Months Ended
	Jun. 30, 2017 USD ($)
State and Municipal securities
Available For Sale And Held To Maturity Securities Unrealized Loss Position [Line Items]
Aggregate unrealized loss position	$ 500