Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Fair Value Disclosure	$ 242,576	$ 341,539
Total Derivative Instruments	2,977
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
US Government Agency Securities At Fair Value	15,520	16,395
State and Municipals	159,234	223,886
Corporate Debt Securities	7,903
Residential Government Sponsored	51,156	86,890
Other government sponsored	8,763	14,368
Available-for-sale Securities, Fair Value Disclosure	242,576	341,539
Interest Rate Swap	2,967
Interest rate cap derivative	10	40
Total Derivative Instruments	2,977
Fair Value Assets Measured On A Recurring Basis	245,553	341,579
Assets measured at fair value Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
US Government Agency Securities At Fair Value	15,520	16,395
State and Municipals	159,234	223,886
Corporate Debt Securities	7,903
Residential Government Sponsored	51,156	86,890
Other government sponsored	8,763	14,368
Available-for-sale Securities, Fair Value Disclosure	242,576	341,539
Interest Rate Swap	2,967
Interest rate cap derivative	10	40
Total Derivative Instruments	2,977
Fair Value Assets Measured On A Recurring Basis	$ 245,553	$ 341,579