Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 Security	Sep. 30, 2012	Dec. 31, 2012
Securities Available for Sale [Abstract]
Amortized Cost	$ 267,919		$ 268,527
Gross Unrealized Gains	298		974
Gross Unrealized Losses	(10,863)		(1,200)
Fair Value	257,354		268,301
Securities Held to Maturity [Abstract]
Fair Value	39		42
Available-for-sale Amortized Cost [Abstract]
Due in One Year or Less	273
Due After One Year Through Five Years	2,599
Due After Five Years Through Ten Years	1,604
Due After Ten Years	1,020
Total	5,496
Mortgage-Backed Securities	262,423
Amortized Cost	267,919
Available-for-sale Fair Value [Abstract]
Due in One Year or Less	276
Due After One Year Through Five Years	2,694
Due After Five Years Through Ten Years	1,582
Due After Ten Years	736
Total	5,288
Mortgage-Backed Securities	252,066
Fair Value	257,354
Held-to-maturity Amortized Cost [Abstract]
Due in One Year or Less	0
Due After One Year Through Five Years	39
Due After Five Years Through Ten Years	0
Due After Ten Years	0
Total	39
Mortgage-Backed Securities	0
Amortized Cost	39
Held-to-maturity Fair Value [Abstract]
Due in One Year or Less	0
Due After One Year Through Five Years	39
Due After Five Years Through Ten Years	0
Due After Ten Years	0
Total	39
Mortgage-Backed Securities	0
Fair Value	39
Proceeds from sale of investment securities available for sale	36,217	161,811
Available-for-sale securities, gross realized gains	191	2,204
Available-for-sale securities, gross realized losses	(193)	(137)
Other than temporary impairment charges		(60)
Fair value of securities on nonaccrual status	132		132
Investment securities pledged	93,350		117,451
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	223,253		143,535
12 Months or Greater, Fair value	5,585		132
Total, Fair Value	228,838		143,667
Less Than 12 Months, Gross Unrealized Losses	(10,528)		(966)
12 Months or Greater, Gross Unrealized Losses	(335)		(234)
Total, Unrealized Losses	(10,863)		(1,200)
Debt securities with unrealized losses, depreciated (in hundredths)	4.53%
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	262,423		263,187
Gross Unrealized Gains	199		835
Gross Unrealized Losses	(10,556)		(962)
Fair Value	252,066		263,060
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	221,584		142,104
12 Months or Greater, Fair value	5,453		0
Total, Fair Value	227,037		142,104
Less Than 12 Months, Gross Unrealized Losses	(10,456)		(962)
12 Months or Greater, Gross Unrealized Losses	(100)		0
Total, Unrealized Losses	(10,556)		(962)
State, County & Municipal [Member]
Securities Available for Sale [Abstract]
Amortized Cost	4,129		3,974
Gross Unrealized Gains	17		34
Gross Unrealized Losses	(72)		(4)
Fair Value	4,074		4,004
Securities Held to Maturity [Abstract]
Amortized Cost	39		41
Gross Unrealized Gains	0		1
Gross Unrealized Losses	0		0
Fair Value	39		42
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	1,669		1,431
12 Months or Greater, Fair value	0		0
Total, Fair Value	1,669		1,431
Less Than 12 Months, Gross Unrealized Losses	(72)		(4)
12 Months or Greater, Gross Unrealized Losses	0		0
Total, Unrealized Losses	(72)		(4)
Corporate Obligations [Member]
Securities Available for Sale [Abstract]
Amortized Cost	1,000		1,000
Gross Unrealized Gains	82		105
Gross Unrealized Losses	0		0
Fair Value	1,082		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)