Investment Securities (Details 2) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value
Less than 12 Months	$ 123,062	$ 96,575
12 months or Longer	126,180	156,312
Total fair value	249,242	252,887
Unrealized Losses
Less than 12 Months	(1,056)	(348)
12 months or Longer	(1,795)	(2,643)
Total unrealized losses	(2,851)	(2,991)
Investment securities pledged as collateral	227,290	231,500
U.S. Treasury and Federal agencies securities
Fair Value
Less than 12 Months	24,563	54,944
12 months or Longer	104,158	115,195
Total fair value	128,721	170,139
Unrealized Losses
Less than 12 Months	(72)	(148)
12 months or Longer	(826)	(1,820)
Total unrealized losses	(898)	(1,968)
U.S. States and political subdivisions securities
Fair Value
Less than 12 Months	31,585	16,805
12 months or Longer	2,068	8,333
Total fair value	33,653	25,138
Unrealized Losses
Less than 12 Months	(241)	(112)
12 months or Longer	(33)	(102)
Total unrealized losses	(274)	(214)
Mortgage-backed securities - Federal agencies
Fair Value
Less than 12 Months	62,521	21,754
12 months or Longer	18,952	32,781
Total fair value	81,473	54,535
Unrealized Losses
Less than 12 Months	(639)	(62)
12 months or Longer	(934)	(719)
Total unrealized losses	(1,573)	(781)
Corporate debt securities
Fair Value
Less than 12 Months	3,833	3,072
12 months or Longer	999	0
Total fair value	4,832	3,072
Unrealized Losses
Less than 12 Months	(19)	(26)
12 months or Longer	(1)	0
Total unrealized losses	(20)	(26)
Foreign government and other securities
Fair Value
Less than 12 Months	0	0
12 months or Longer	0	0
Total fair value	0	0
Unrealized Losses
Less than 12 Months	0	0
12 months or Longer	0	0
Total unrealized losses	0	0
Total debt securities
Fair Value
Less than 12 Months	122,502	96,575
12 months or Longer	126,177	156,309
Total fair value	248,679	252,884
Unrealized Losses
Less than 12 Months	(971)	(348)
12 months or Longer	(1,794)	(2,641)
Total unrealized losses	(2,765)	(2,989)
Marketable equity securities
Fair Value
Less than 12 Months	560	0
12 months or Longer	3	3
Total fair value	563	3
Unrealized Losses
Less than 12 Months	(85)	0
12 months or Longer	(1)	(2)
Total unrealized losses	$ (86)	$ (2)