Securities (Details 1) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Amortized Cost
Due in one year or less	$ 5,798
Due after one but within five years	54,999
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	92,856
Due after ten years	75,726
Total of securities having specified maturity period	229,379
TOTAL	863,376	$ 876,796
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	633,997
Fair Value
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	5,900
Due after one but within five years	56,698
Due after five but within ten years	97,877
Due after ten years	81,572
Total of securities having specified maturities period	242,047
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	642,129
Securities available-for-sale	$ 884,176	$ 891,082