Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013 Security	Jun. 30, 2012	Dec. 31, 2012
Securities Available for Sale [Abstract]
Amortized Cost	$ 275,232		$ 268,527
Gross Unrealized Gains	262		974
Gross Unrealized Losses	(8,363)		(1,200)
Fair Value	267,131		268,301
Securities Held to Maturity [Abstract]
Fair Value	38		42
Available-for-sale Amortized Cost [Abstract]
Due After One Year Through Five Years	2,751
Due After Five Years Through Ten Years	1,754
Due After Ten Years	1,020
Total	5,525
Mortgage-Backed Securities	269,707
Amortized Cost	275,232
Available-for-sale Fair Value [Abstract]
Due After One Year Through Five Years	2,855
Due After Five Years Through Ten Years	1,740
Due After Ten Years	743
Total	5,338
Mortgage-Backed Securities	261,793
Fair Value	267,131
Held-to-maturity Amortized Cost [Abstract]
Due After One Year Through Five Years	38
Due After Five Years Through Ten Years	0
Due After Ten Years	0
Total	38
Mortgage-Backed Securities	0
Amortized Cost	38
Held-to-maturity Fair Value [Abstract]
Due After One Year Through Five Years	38
Due After Five Years Through Ten Years	0
Due After Ten Years	0
Total	38
Mortgage-Backed Securities	0
Fair Value	38
Proceeds from sale of investment securities available for sale	36,217	60,654
Available-for-sale securities, gross realized gains	191	990
Available-for-sale securities, gross realized losses	(193)	(110)
Fair value of securities on nonaccrual status	132		132
Investment securities pledged	100,326		117,451
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	248,472		143,535
12 Months or Greater, Fair value	132		132
Total, Fair Value	248,604		143,667
Less Than 12 Months, Gross Unrealized Losses	(8,128)		(966)
12 Months or Greater, Gross Unrealized Losses	(235)		(234)
Total, Unrealized Losses	(8,363)		(1,200)
Debt securities with unrealized losses, depreciated (in hundredths)	3.25%
Number of asset-backed security owned	1
Periods for asset-backed security in continuous unrealized loss position, minimum	12 months
Number of issuance of trust preferred security	1
Book value of trust preferred security	367
Unrealized loss on trust preferred security	235
US Government Agencies Mortgage-Backed [Member]
Securities Available for Sale [Abstract]
Amortized Cost	269,707		263,187
Gross Unrealized Gains	156		835
Gross Unrealized Losses	(8,070)		(962)
Fair Value	261,793		263,060
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	246,778		142,104
12 Months or Greater, Fair value	0		0
Total, Fair Value	246,778		142,104
Less Than 12 Months, Gross Unrealized Losses	(8,070)		(962)
12 Months or Greater, Gross Unrealized Losses	0		0
Total, Unrealized Losses	(8,070)		(962)
State, County & Municipal [Member]
Securities Available for Sale [Abstract]
Amortized Cost	4,158		3,974
Gross Unrealized Gains	21		34
Gross Unrealized Losses	(58)		(4)
Fair Value	4,121		4,004
Securities Held to Maturity [Abstract]
Amortized Cost	38		41
Gross Unrealized Gains	0		1
Gross Unrealized Losses	0		0
Fair Value	38		42
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	1,694		1,431
12 Months or Greater, Fair value	0		0
Total, Fair Value	1,694		1,431
Less Than 12 Months, Gross Unrealized Losses	(58)		(4)
12 Months or Greater, Gross Unrealized Losses	0		0
Total, Unrealized Losses	(58)		(4)
Corporate Obligations [Member]
Securities Available for Sale [Abstract]
Amortized Cost	1,000		1,000
Gross Unrealized Gains	85		105
Gross Unrealized Losses	0		0
Fair Value	1,085		1,105
Asset-Backed Securities [Member]
Securities Available for Sale [Abstract]
Amortized Cost	367		366
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(235)		(234)
Fair Value	132		132
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	0		0
12 Months or Greater, Fair value	132		132
Total, Fair Value	132		132
Less Than 12 Months, Gross Unrealized Losses	0		0
12 Months or Greater, Gross Unrealized Losses	(235)		(234)
Total, Unrealized Losses	$ (235)		$ (234)