Investment Securities (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($) Investment	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Security Investment	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Security
Investments Debt And Equity Securities [Abstract]
Trading securities	$ 182,000		$ 182,000		$ 8,134,000
Carrying value of investment securities for pledge	112,000,000		$ 112,000,000		$ 108,200,000
Investment securities with fair value less than amortized cost | Security			16		34
Impairment loss recognized through impairment assessment process	0	$ 0	$ 0	$ 0
Non-accrual investment securities	$ 715,000		$ 715,000		$ 778,000
Trust preferred securities in nonaccrual status | Investment	2		2
Estimated length of interest payment delays			10 years