5. Securities (Summary Of Securities Available For Sale In Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Less than 12 months, Estimated Fair Value	$ 121,832	$ 60,463
Less than 12 months, Unrealized Loss	(3,945)	(746)
12 months or more, Estimated Fair Value	9,516	12,417
12 months or more, Unrealized Loss	(198)	(254)
Total Estimated Fair Value	131,348	72,880
Total Unrealized Loss	(4,143)	(1,000)
TemporarilyImpairedSecuritiesMember
Less than 12 months, Estimated Fair Value	121,832	60,198
Less than 12 months, Unrealized Loss	(3,945)	(740)
12 months or more, Estimated Fair Value	9,487	11,824
12 months or more, Unrealized Loss	(167)	(134)
Total Estimated Fair Value	131,319	72,022
Total Unrealized Loss	(4,112)	(874)
TemporarilyImpairedSecuritiesMember | US Government Corporations And Agencies Securities
Less than 12 months, Estimated Fair Value	3,786
Less than 12 months, Unrealized Loss	(27)
12 months or more, Estimated Fair Value	0
12 months or more, Unrealized Loss	0
Total Estimated Fair Value	3,786
Total Unrealized Loss	(27)
TemporarilyImpairedSecuritiesMember | Government Sponsored Agencies [Member]
Less than 12 months, Estimated Fair Value	65,600	36,498
Less than 12 months, Unrealized Loss	(1,352)	(414)
12 months or more, Estimated Fair Value	8,045	8,997
12 months or more, Unrealized Loss	(158)	(78)
Total Estimated Fair Value	73,645	45,495
Total Unrealized Loss	(1,510)	(492)
TemporarilyImpairedSecuritiesMember | Nongovernment Sponsored Agencies [Member]
Less than 12 months, Estimated Fair Value	632	0
Less than 12 months, Unrealized Loss	(6)	(4)
12 months or more, Estimated Fair Value	1,056	1,478
12 months or more, Unrealized Loss	(5)	(14)
Total Estimated Fair Value	1,688	1,478
Total Unrealized Loss	(11)	(18)
TemporarilyImpairedSecuritiesMember | U S States And Political Subdivisions [Member]
Less than 12 months, Estimated Fair Value	9,997	3,766
Less than 12 months, Unrealized Loss	(489)	(85)
12 months or more, Estimated Fair Value	386	387
12 months or more, Unrealized Loss	(4)	(4)
Total Estimated Fair Value	10,383	4,153
Total Unrealized Loss	(493)	(89)
TemporarilyImpairedSecuritiesMember | Corporate Debt Securities [Member]
Less than 12 months, Estimated Fair Value	2,965	0
Less than 12 months, Unrealized Loss	(34)	0
12 months or more, Estimated Fair Value	0	962
12 months or more, Unrealized Loss	0	(38)
Total Estimated Fair Value	2,965	962
Total Unrealized Loss	(34)	(38)
TemporarilyImpairedSecuritiesMember | Tax Exempt Debt Securities Us States And Political Subdivisions [Member]
Less than 12 months, Estimated Fair Value	38,852	19,934
Less than 12 months, Unrealized Loss	(2,037)	(237)
12 months or more, Estimated Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total Estimated Fair Value	38,852	19,934
Total Unrealized Loss	(2,037)	(237)
Other Than Temporarily Impaired Securities [Member]
Less than 12 months, Estimated Fair Value	0	265
Less than 12 months, Unrealized Loss	0	(6)
12 months or more, Estimated Fair Value	29	593
12 months or more, Unrealized Loss	(31)	(120)
Total Estimated Fair Value	29	858
Total Unrealized Loss	(31)	(126)
Other Than Temporarily Impaired Securities [Member] | Nongovernment Sponsored Agencies [Member]
Less than 12 months, Estimated Fair Value	0	265
Less than 12 months, Unrealized Loss	0	(6)
12 months or more, Estimated Fair Value	29	593
12 months or more, Unrealized Loss	(31)	(120)
Total Estimated Fair Value	29	858
Total Unrealized Loss	$ (31)	$ (126)