Securities (Details 2) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Securities available for sale, Amortized cost
Due within 1 year	$ 82,268,000
Due after 1 but within 5 years	119,806,000
Due after 5 but within 10 years	22,109,000
Due after 10 years	72,324,000
Mortgage-backed securities	167,768,000
Corporate equity securities	756,000
Total securities available-for-sale	465,031,000	509,276,000
Securities available for sale, Fair value
Due within 1 year	82,406,000
Due after 1 but within 5 years	121,898,000
Due after 5 but within 10 years	22,854,000
Due after 10 years	73,635,000
Mortgage-backed securities	169,895,000
Corporate equity securities	1,014,000
Total securities available-for-sale, fair value	471,702,000	513,056,000
Carrying value of securities pledged to secure accounts of commercial depositors	$ 250,200,000	$ 263,100,000