Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	$ 155,142	$ 209,920
Unrealized Losses, Less Than 12 Months	(3,984)	(6,920)
Fair Value, 12 Months or Longer	77,061	67,237
Unrealized Losses, 12 Months or Longer	(4,854)	(5,106)
Fair Value, Total	232,203	277,157
Unrealized Losses, Total	(8,838)	(12,026)
Corporate bonds
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	351	1,052
Unrealized Losses, Less Than 12 Months	(1)	(2)
Fair Value, 12 Months or Longer	475	473
Unrealized Losses, 12 Months or Longer	(10)	(13)
Fair Value, Total	826	1,525
Unrealized Losses, Total	(11)	(15)
U.S. Treasury and U.S. government sponsored entities
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	21,400	20,776
Unrealized Losses, Less Than 12 Months	(317)	(387)
Fair Value, 12 Months or Longer	0	0
Unrealized Losses, 12 Months or Longer	0	0
Fair Value, Total	21,400	20,776
Unrealized Losses, Total	(317)	(387)
State and political subdivisions
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	19,866	34,851
Unrealized Losses, Less Than 12 Months	(669)	(1,855)
Fair Value, 12 Months or Longer	12,936	7,492
Unrealized Losses, 12 Months or Longer	(1,248)	(952)
Fair Value, Total	32,802	42,343
Unrealized Losses, Total	(1,917)	(2,807)
Mortgage-backed securities - residential
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	106,280	141,024
Unrealized Losses, Less Than 12 Months	(2,453)	(3,735)
Fair Value, 12 Months or Longer	26,649	27,026
Unrealized Losses, 12 Months or Longer	(975)	(1,349)
Fair Value, Total	132,929	168,050
Unrealized Losses, Total	(3,428)	(5,084)
Collateralized mortgage obligations
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	5,208	5,283
Unrealized Losses, Less Than 12 Months	(414)	(450)
Fair Value, 12 Months or Longer	15,610	15,726
Unrealized Losses, 12 Months or Longer	(1,029)	(1,263)
Fair Value, Total	20,818	21,009
Unrealized Losses, Total	(1,443)	(1,713)
Small business administration
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	2,018	6,927
Unrealized Losses, Less Than 12 Months	(129)	(491)
Fair Value, 12 Months or Longer	21,391	16,520
Unrealized Losses, 12 Months or Longer	(1,592)	(1,529)
Fair Value, Total	23,409	23,447
Unrealized Losses, Total	(1,721)	(2,020)
Equity securities
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	19	7
Unrealized Losses, Less Than 12 Months	(1)	0
Fair Value, 12 Months or Longer	0	0
Unrealized Losses, 12 Months or Longer	0	0
Fair Value, Total	19	7
Unrealized Losses, Total	$ (1)	$ 0