4. Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Available for sale securities, Amortized Cost	$ 289,614	$ 273,684
Available for sale securities, Unrealized Gains	3,851	8,855
Available for sale securities, Unrealized Losses	4,685	1,000
Available for sale securities, Estimated Fair Value	288,780	281,539
West Virginia [Member]
Available for sale securities, Amortized Cost	15,277
Available for sale securities, Unrealized Gains	78
Available for sale securities, Unrealized Losses	285
Available for sale securities, Estimated Fair Value	15,070
California [Member]
Available for sale securities, Amortized Cost	9,177
Available for sale securities, Unrealized Gains	86
Available for sale securities, Unrealized Losses	249
Available for sale securities, Estimated Fair Value	9,014
Illinois [Member]
Available for sale securities, Amortized Cost	8,968
Available for sale securities, Unrealized Gains	21
Available for sale securities, Unrealized Losses	543
Available for sale securities, Estimated Fair Value	8,446
Texas [Member]
Available for sale securities, Amortized Cost	7,651
Available for sale securities, Unrealized Gains	240
Available for sale securities, Unrealized Losses	190
Available for sale securities, Estimated Fair Value	7,701
Washington [Member]
Available for sale securities, Amortized Cost	4,400
Available for sale securities, Unrealized Gains	104
Available for sale securities, Unrealized Losses	85
Available for sale securities, Estimated Fair Value	$ 4,419