Borrowings (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Preferred Securities and Subordinated Debentures Maturity Date	Jun. 15, 2037
Trust Affiliate I [Member]
Issuance Of Trust Preferred Securities	$ 20.0
Issuance Of Subordinated Debentures	$ 20.6
Coupon Rate On Preferred Securities, Period End	3.50%	2.97%
Preferred Securities Variable Interest Rate	LIBOR rate plus 1.38%.
Trust Affiliate II [Member]
Issuance Of Trust Preferred Securities	$ 15.0
Issuance Of Subordinated Debentures	$ 15.5
Coupon Rate On Preferred Securities, Period End	3.62%	3.09%
Preferred Securities Variable Interest Rate	LIBOR rate plus 1.5%.