Securities (Details 1) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Amortized Cost
Due in one year or less	$ 3,540
Due after one but within five years	32,475
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	75,099
Due after ten years	132,450
Total of securities having specified maturity period	243,564
TOTAL	795,380	$ 811,369
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	551,816
Fair Value
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	3,543
Due after one but within five years	32,968
Due after five but within ten years	76,199
Due after ten years	134,673
Total of securities having specified maturities period	247,383
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	535,226
Securities available-for-sale	$ 782,609	$ 814,931