Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Securities Available for Sale [Abstract]
Amortized Cost	$ 290,313		$ 277,008
Gross Unrealized Gains	220		134
Gross Unrealized Losses	(11,576)		(13,884)
Fair Value	278,957		263,258
Securities Held to Maturity [Abstract]
Fair Value	38		37
Available-for-sale Amortized Cost [Abstract]
Due in One Year or Less	779
Due After One Year Through Five Years	1,245
Due After Five Years Through Ten Years	1,198
Due After Ten Years	653
Total	3,875
Mortgage-Backed Securities	286,438
Amortized Cost	290,313
Available-for-sale Fair Value [Abstract]
Due in One Year or Less	782
Due After One Year Through Five Years	1,252
Due After Five Years Through Ten Years	1,174
Due After Ten Years	626
Total	3,834
Mortgage-Backed Securities	275,123
Fair Value	278,957
Held-to-maturity Amortized Cost [Abstract]
Due in One Year or Less	0
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 in One Year or Less	0
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	0	30,418
Available-for-sale securities, gross realized gains	0	125
Available-for-sale securities, gross realized losses	0	(133)
Investment securities pledged	113,418		112,913
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	142,928		191,711
12 Months or Greater, Fair value	116,250		63,194
Total, Fair Value	259,178		254,905
Less Than 12 Months, Gross Unrealized Losses	(4,740)		(9,525)
12 Months or Greater, Gross Unrealized Losses	(6,836)		(4,359)
Total, Unrealized Losses	(11,576)		(13,884)
Debt securities with unrealized losses, depreciated (in hundredths)	4.28%
US Government Agencies Mortgage-Backed [Member]
Securities Available for Sale [Abstract]
Amortized Cost	286,438		273,029
Gross Unrealized Gains	209		119
Gross Unrealized Losses	(11,524)		(13,800)
Fair Value	275,123		259,348
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	141,975		190,064
12 Months or Greater, Fair value	115,624		63,194
Total, Fair Value	257,599		253,258
Less Than 12 Months, Gross Unrealized Losses	(4,715)		(9,441)
12 Months or Greater, Gross Unrealized Losses	(6,809)		(4,359)
Total, Unrealized Losses	(11,524)		(13,800)
State, County & Municipal [Member]
Securities Available for Sale [Abstract]
Amortized Cost	3,875		3,979
Gross Unrealized Gains	11		15
Gross Unrealized Losses	(52)		(84)
Fair Value	3,834		3,910
Securities Held to Maturity [Abstract]
Amortized Cost	38		37
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Fair Value	38		37
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	953		1,647
12 Months or Greater, Fair value	626		0
Total, Fair Value	1,579		1,647
Less Than 12 Months, Gross Unrealized Losses	(25)		(84)
12 Months or Greater, Gross Unrealized Losses	(27)		0
Total, Unrealized Losses	$ (52)		$ (84)