Securities (Details 1) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Amortized Cost
Due in one year or less	$ 5,085
Due after one but within five years	47,719
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	84,849
Due after ten years	105,496
Total of securities having specified maturity period	243,149
TOTAL	852,434	$ 855,521
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	609,285
Fair Value
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	5,118
Due after one but within five years	48,850
Due after five but within ten years	87,510
Due after ten years	107,596
Total of securities having specified maturities period	249,074
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	606,607
Securities available-for-sale	$ 855,681	$ 853,725