Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Amortized Cost
Due within one year
Due after one year but within five years	14,498
Due after five years but within ten years
Due after ten years	1,000
Mortgage-backed securities	147,749
Total debt securities	163,247
Equity securities	3,985
Total securities	167,232	164,063
Fair Value
Due within one year
Due after one year but within five years	14,653
Due after five years but within ten years
Due after ten years	800
Mortgage-backed securities	150,773
Total debt securities	166,226
Equity securities	3,988
Total securities	170,214	167,352	159,182
Amortized Cost
Due within one year
Due after one year but within five years	5,610
Due after five years but within ten years	33,627
Due after ten years	16,412
Mortgage-backed securities
Total debt securities	55,649
Total securities	55,649	56,064	57,066
Fair Value
Due within one year
Due after one year but within five years	6,121
Due after five years but within ten years	36,758
Due after ten years	17,879
Total debt securities	60,758
Total securities	$ 60,758	$ 61,496	$ 61,226