Investment Securities (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value
Less than 12 Months	$ 296,803,000	$ 51,410,000
12 months or Longer	21,860,000	7,860,000
Total	318,663,000	59,270,000
Unrealized Losses
Less than 12 Months	(8,321,000)	(153,000)
12 months or Longer	(622,000)	(535,000)
Total	(8,943,000)	(688,000)
Investment securities pledged as collateral	237,420,000	216,340,000
U.S. Treasury and Federal agencies securities
Fair Value
Less than 12 Months	153,868,000	37,316,000
12 months or Longer	15,085,000	0
Total	168,953,000	37,316,000
Unrealized Losses
Less than 12 Months	(4,404,000)	(83,000)
12 months or Longer	(123,000)	0
Total	(4,527,000)	(83,000)
U.S. States and political subdivisions securities
Fair Value
Less than 12 Months	37,115,000	7,730,000
12 months or Longer	1,419,000	3,364,000
Total	38,534,000	11,094,000
Unrealized Losses
Less than 12 Months	(814,000)	(46,000)
12 months or Longer	(33,000)	(436,000)
Total	(847,000)	(482,000)
Mortgage-backed securities - Federal agencies
Fair Value
Less than 12 Months	99,488,000	6,264,000
12 months or Longer	5,352,000	60,000
Total	104,840,000	6,324,000
Unrealized Losses
Less than 12 Months	(3,099,000)	(24,000)
12 months or Longer	(464,000)	(1,000)
Total	(3,563,000)	(25,000)
Corporate debt securities
Fair Value
Less than 12 Months	6,332,000	0
12 months or Longer	0	4,431,000
Total	6,332,000	4,431,000
Unrealized Losses
Less than 12 Months	(4,000)	0
12 months or Longer	0	(94,000)
Total	(4,000)	(94,000)
Foreign government and other securities
Fair Value
Less than 12 Months	0	100,000
12 months or Longer	0	0
Total	0	100,000
Unrealized Losses
Less than 12 Months	0	0
12 months or Longer	0	0
Total	0	0
Total debt securities
Fair Value
Less than 12 Months	296,803,000	51,410,000
12 months or Longer	21,856,000	7,855,000
Total	318,659,000	59,265,000
Unrealized Losses
Less than 12 Months	(8,321,000)	(153,000)
12 months or Longer	(620,000)	(531,000)
Total	(8,941,000)	(684,000)
Marketable equity securities
Fair Value
Less than 12 Months	0	0
12 months or Longer	4,000	5,000
Total	4,000	5,000
Unrealized Losses
Less than 12 Months	0	0
12 months or Longer	(2,000)	(4,000)
Total	$ (2,000)	$ (4,000)