Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Amortized Cost
Due in one year or less	$ 12,171
Due after one but within five years	35,071
Due after five but within ten years	83,992
Due after ten years	535,008
Total of securities having specified maturity period	666,242
Mortgage-backed securities and equities	208,712
TOTAL	874,954	668,615
Fair Value
Due in one year or less	12,263
Due after one but within five years	36,659
Due after five but within ten years	86,735
Due after ten years	521,606
Total of securities having specified maturities period	657,263
Mortgage-backed securities and equities	215,412
Fair Value	$ 872,675	$ 691,000