Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Gain on sale of investments	$ (13)	$ (9)	$ (26)	$ (23)
Gross unrealized losses	2,657		2,657			$ 6,719
Cumulative OTTI charges	13,974	$ 13,995	13,974	$ 13,995	$ 13,974	13,995	$ 13,995	$ 14,050
Amortized Cost	842,700		842,700			876,796
Securities available-for-sale	$ 866,701		$ 866,701			$ 891,082
Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Basis point spread on variable rate	1.60%		1.60%
Minimum [Member] | Standard Poors [Member]
Schedule of Available-for-sale Securities [Line Items]
Credit Quality Indicator Pricing	38.75		38.75
Minimum [Member] | Moody Investor Service [Member]
Schedule of Available-for-sale Securities [Line Items]
Credit Quality Indicator Pricing	13.25		13.25
Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Basis point spread on variable rate	1.80%		1.80%
Maximum [Member] | Standard Poors [Member]
Schedule of Available-for-sale Securities [Line Items]
Credit Quality Indicator Pricing	46.66		46.66
Maximum [Member] | Moody Investor Service [Member]
Schedule of Available-for-sale Securities [Line Items]
Credit Quality Indicator Pricing	41.62		41.62