Securities (Details 1) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized Cost
Due in one year or less	$ 3,965
Due after one but within five years	32,844
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	74,009
Due after ten years	133,968
Total of securities having specified maturity period	244,786
TOTAL	803,271	$ 811,369
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	558,485
Fair Value
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	3,961
Due after one but within five years	33,151
Due after five but within ten years	74,647
Due after ten years	134,736
Total of securities having specified maturities period	246,495
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	539,198
Securities available-for-sale	$ 785,693	$ 814,931