Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Securities Available for Sale [Abstract]
Amortized Cost	$ 283,326		$ 281,935
Gross Unrealized Gains	439		183
Gross Unrealized Losses	(4,626)		(7,524)
Fair Value	279,139		274,594
Securities Held to Maturity [Abstract]
Amortized Cost	31		30
Fair Value	31		30
Available-for-sale Amortized Cost [Abstract]
Due in One Year or Less	215
Due After One Year Through Five Years	719
Due After Five Years Through Ten Years	1,050
Due After Ten Years	1,179
Total	3,163
Mortgage-Backed Securities	280,163
Amortized Cost	283,326
Available-for-sale Fair Value [Abstract]
Due in One Year or Less	215
Due After One Year Through Five Years	729
Due After Five Years Through Ten Years	1,038
Due After Ten Years	1,186
Total	3,168
Mortgage-Backed Securities	275,971
Fair Value	279,139
Held-to-maturity Amortized Cost [Abstract]
Due in One Year or Less	31
Due After One Year Through Five Years	0
Due After Five Years Through Ten Years	0
Due After Ten Years	0
Total	31
Mortgage-Backed Securities	0
Amortized Cost	31		30
Held-to-maturity Fair Value [Abstract]
Due in One Year or Less	31
Due After One Year Through Five Years	0
Due After Five Years Through Ten Years	0
Due After Ten Years	0
Total	31
Mortgage-Backed Securities	0
Fair Value	31		30
Proceeds from sale of investment securities available for sale	25,173	0
Available-for-sale securities, gross realized gains	199	0
Available-for-sale securities, gross realized losses	196	0
Investment securities pledged	126,792		135,532
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	38,625		66,609
Less Than 12 Months, Gross Unrealized Losses	(148)		(397)
12 Months or Greater, Fair value	160,415		185,025
12 Months or Greater, Gross Unrealized Losses	(4,478)		(7,127)
Total, Fair Value	199,040		251,634
Total, Gross Unrealized Losses	(4,626)		(7,524)
Debt securities with unrealized losses, depreciated (in hundredths)	2.27%
US Government Agencies Mortgage-Backed [Member]
Securities Available for Sale [Abstract]
Amortized Cost	280,163		278,419
Gross Unrealized Gains	406		156
Gross Unrealized Losses	(4,598)		(7,511)
Fair Value	275,971		271,064
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	37,934		66,609
Less Than 12 Months, Gross Unrealized Losses	(141)		(397)
12 Months or Greater, Fair value	159,595		183,646
12 Months or Greater, Gross Unrealized Losses	(4,457)		(7,114)
Total, Fair Value	197,529		250,255
Total, Gross Unrealized Losses	(4,598)		(7,511)
State, County & Municipal [Member]
Securities Available for Sale [Abstract]
Amortized Cost	3,163		3,516
Gross Unrealized Gains	33		27
Gross Unrealized Losses	(28)		(13)
Fair Value	3,168		3,530
Securities Held to Maturity [Abstract]
Amortized Cost	31		30
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Fair Value	31		30
Held-to-maturity Amortized Cost [Abstract]
Amortized Cost	31		30
Held-to-maturity Fair Value [Abstract]
Fair Value	31		30
Continuous unrealized loss position [Abstract]
Less Than 12 Months, Fair value	691		0
Less Than 12 Months, Gross Unrealized Losses	(7)		0
12 Months or Greater, Fair value	820		1,379
12 Months or Greater, Gross Unrealized Losses	(21)		(13)
Total, Fair Value	1,511		1,379
Total, Gross Unrealized Losses	$ (28)		$ (13)