Investment Securities (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value
Less than 12 Months	$ 257,218	$ 96,575
12 months or Longer	67,762	156,312
Total	324,980	252,887
Unrealized Losses
Less than 12 Months	(2,060)	(348)
12 months or Longer	(1,400)	(2,643)
Total	(3,460)	(2,991)
Investment securities pledged as collateral	233,140	231,500
U.S. Treasury and Federal agencies securities
Fair Value
Less than 12 Months	151,581	54,944
12 months or Longer	43,372	115,195
Total	194,953	170,139
Unrealized Losses
Less than 12 Months	(928)	(148)
12 months or Longer	(578)	(1,820)
Total	(1,506)	(1,968)
U.S. States and political subdivisions securities
Fair Value
Less than 12 Months	17,040	16,805
12 months or Longer	3,795	8,333
Total	20,835	25,138
Unrealized Losses
Less than 12 Months	(79)	(112)
12 months or Longer	(64)	(102)
Total	(143)	(214)
Mortgage-backed securities - Federal agencies
Fair Value
Less than 12 Months	78,731	21,754
12 months or Longer	20,592	32,781
Total	99,323	54,535
Unrealized Losses
Less than 12 Months	(777)	(62)
12 months or Longer	(756)	(719)
Total	(1,533)	(781)
Corporate debt securities
Fair Value
Less than 12 Months	9,340	3,072
12 months or Longer	0	0
Total	9,340	3,072
Unrealized Losses
Less than 12 Months	(57)	(26)
12 months or Longer	0	0
Total	(57)	(26)
Foreign government and other securities
Fair Value
Less than 12 Months	99	0
12 months or Longer	0	0
Total	99	0
Unrealized Losses
Less than 12 Months	(1)	0
12 months or Longer	0	0
Total	(1)	0
Total debt securities
Fair Value
Less than 12 Months	256,791	96,575
12 months or Longer	67,759	156,309
Total	324,550	252,884
Unrealized Losses
Less than 12 Months	(1,842)	(348)
12 months or Longer	(1,398)	(2,641)
Total	(3,240)	(2,989)
Marketable equity securities
Fair Value
Less than 12 Months	427	0
12 months or Longer	3	3
Total	430	3
Unrealized Losses
Less than 12 Months	(218)	0
12 months or Longer	(2)	(2)
Total	$ (220)	$ (2)