Investment Securities (Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Mortgage-backed U.S. government agencies [Member]	Dec. 31, 2012 Mortgage-backed U.S. government agencies [Member]	Mar. 31, 2013 State and political subdivision obligations [Member]	Dec. 31, 2012 State and political subdivision obligations [Member]	Mar. 31, 2013 Equity securities [Member]	Dec. 31, 2012 Equity securities [Member]
Schedule of Investments [Line Items]
Less than 12 Months: Fair Value	$ 35,471	$ 39,734	$ 18,847	$ 30,345	$ 16,624	$ 9,389
Less than 12 Months: Unrealized Losses	554	336	230	270	324	66
12 Months or More: Fair Value	12,423	17,460	10,785	15,839	1,238	1,231	400	390
12 Months or More: Unrealized Losses	187	260	146	220	28	30	13	10
Total: Fair Value	47,894	57,194	29,632	46,184	17,862	10,620	400	390
Total: Unrealized Losses	$ 741	$ 596	$ 376	$ 490	$ 352	$ 96	$ 13	$ 10