Securities (Details 1) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Amortized Cost
Due in one year or less	$ 5,342
Due after one but within five years	43,735
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	82,145
Due after ten years	117,261
Total of securities having specified maturity period	248,483
TOTAL	824,222	$ 855,521
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	575,739
Fair Value
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	5,374
Due after one but within five years	45,078
Due after five but within ten years	85,260
Due after ten years	123,766
Total of securities having specified maturities period	259,478
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	575,946
Securities available-for-sale	$ 835,424	$ 853,725