Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Amortized Cost
Due in one year or less	$ 14,192
Due after one but within five years	30,512
Due after five but within ten years	88,599
Due after ten years	476,020
Total of securities having specified maturity period	609,323
Mortgage-backed securities and equities	226,213
TOTAL	835,536	668,615
Fair Value
Due in one year or less	14,321
Due after one but within five years	31,986
Due after five but within ten years	91,523
Due after ten years	466,419
Total of securities having specified maturities period	604,249
Mortgage-backed securities and equities	232,798
TOTAL	$ 837,047	$ 691,000