Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other Government Agencies [Member]
Schedule of Unrealized Losses on Investment Securities
Less than 12 months, fair value	$ 38,077	$ 24,486
Less than 12 months, unrealized losses	(175)	(12)
Less than 12 months number of securities	6	7
12 months or more fair value
12 months or more, unrealized losses
12 months or more number of securities
Fair value, Total	38,077	24,486
Unrealized losses, Total	(175)	(12)
Number of securities Total	6	7
Residential mortgage-backed securities and collateralized mortgage obligations of government agencies [Member]
Schedule of Unrealized Losses on Investment Securities
Less than 12 months, fair value	128,008	133,106
Less than 12 months, unrealized losses	(529)	(646)
Less than 12 months number of securities	24	34
12 months or more fair value	552	795
12 months or more, unrealized losses	(17)	(23)
12 months or more number of securities	1	2
Fair value, Total	128,560	133,901
Unrealized losses, Total	(546)	(669)
Number of securities Total	25	36
Other Residential Collateralized Mortgage Obligations [Member]
Schedule of Unrealized Losses on Investment Securities
Less than 12 months, fair value		185
Less than 12 months, unrealized losses		(1)
Less than 12 months number of securities		1
12 months or more fair value
12 months or more, unrealized losses
12 months or more number of securities
Fair value, Total		185
Unrealized losses, Total		(1)
Number of securities Total		1
Obligations of States and Political Subdivisions [Member]
Schedule of Unrealized Losses on Investment Securities
Less than 12 months, fair value	40,560	14,443
Less than 12 months, unrealized losses	(572)	(146)
Less than 12 months number of securities	59	20
12 months or more fair value		1,902
12 months or more, unrealized losses		(5)
12 months or more number of securities		4
Fair value, Total	40,560	16,345
Unrealized losses, Total	(572)	(151)
Number of securities Total	59	24
Corporate Debt Securities [Member]
Schedule of Unrealized Losses on Investment Securities
Less than 12 months, fair value	7,985	19,763
Less than 12 months, unrealized losses	(96)	(145)
Less than 12 months number of securities	4	11
12 months or more fair value	11,645	13,103
12 months or more, unrealized losses	(355)	(898)
12 months or more number of securities	4	5
Fair value, Total	19,630	32,866
Unrealized losses, Total	(451)	(1,043)
Number of securities Total	8	16
Equity Securities [Member]
Schedule of Unrealized Losses on Investment Securities
Less than 12 months, fair value		4
Less than 12 months, unrealized losses		(1)
Less than 12 months number of securities		2
12 months or more fair value
12 months or more, unrealized losses
12 months or more number of securities
Fair value, Total		4
Unrealized losses, Total		(1)
Number of securities Total		2
Total Temporarily Impaired Securities [Member]
Schedule of Unrealized Losses on Investment Securities
Less than 12 months, fair value	214,630	191,987
Less than 12 months, unrealized losses	(1,372)	(951)
Less than 12 months number of securities	93	75
12 months or more fair value	12,197	15,800
12 months or more, unrealized losses	(372)	(926)
12 months or more number of securities	5	11
Fair value, Total	226,827	207,787
Unrealized losses, Total	$ (1,744)	$ (1,877)
Number of securities Total	98	86