5. Securities (Summary of Volume of State and Political Subdivision Securities Held in Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Available for sale securities, Amortized Cost	$ 283,248	$ 289,822	$ 289,614
Available for sale securities, Unrealized Gains	6,339	5,501	3,851
Available for sale securities, Unrealized Losses	1,704	4,143	4,685
Available for sale securities, Estimated Fair Value	287,883	291,180	288,780
California [Member]
Available for sale securities, Amortized Cost	17,649
Available for sale securities, Unrealized Gains	470
Available for sale securities, Unrealized Losses	41
Available for sale securities, Estimated Fair Value	18,078
West Virginia [Member]
Available for sale securities, Amortized Cost	12,313
Available for sale securities, Unrealized Gains	242
Available for sale securities, Unrealized Losses	54
Available for sale securities, Estimated Fair Value	12,501
Illinois [Member]
Available for sale securities, Amortized Cost	8,941
Available for sale securities, Unrealized Gains	142
Available for sale securities, Unrealized Losses	77
Available for sale securities, Estimated Fair Value	9,006
Texas [Member]
Available for sale securities, Amortized Cost	7,380
Available for sale securities, Unrealized Gains	368
Available for sale securities, Unrealized Losses	74
Available for sale securities, Estimated Fair Value	7,674
Pennsylvania [Member]
Available for sale securities, Amortized Cost	7,298
Available for sale securities, Unrealized Gains	64
Available for sale securities, Unrealized Losses	49
Available for sale securities, Estimated Fair Value	$ 7,313