Investment Securities (Detail Textuals) - Security	Jun. 30, 2017	Dec. 31, 2016
Schedule Of Available For Sale and Held To Maturity Securities [Line Items]
Number of securities in unrealized loss position	23	27
Number of securities in unrealized loss position in for greater than twelve months	5	3
Number of securities in unrealized loss position in for less than twelve months	18	24
Mortgage-backed securities - residential
Schedule Of Available For Sale and Held To Maturity Securities [Line Items]
Number of securities in unrealized loss position in for greater than twelve months	4
Number of securities in unrealized loss position in for less than twelve months	11
State and political subdivisions
Schedule Of Available For Sale and Held To Maturity Securities [Line Items]
Number of securities in unrealized loss position in for greater than twelve months	1
Number of securities in unrealized loss position in for less than twelve months	7