Securities (Details 1) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Amortized Cost
Due in one year or less	$ 6,948
Due after one but within five years	54,311
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	89,092
Due after ten years	79,980
Total of securities having specified maturity period	230,331
TOTAL	853,807	$ 876,796
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	623,476
Fair Value
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	7,026
Due after one but within five years	55,913
Due after five but within ten years	94,509
Due after ten years	85,488
Total of securities having specified maturities period	242,936
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	633,602
Securities available-for-sale	$ 876,538	$ 891,082