Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Financial assets, Carrying Amount
Cash and cash equivalents, Carrying Amount	$ 124,506	$ 200,193	$ 169,573	$ 127,742
Investment securities held to maturity' Carrying Amount	2,591	2,657
Loans, net, Carrying Amount	766,465	769,091
Financial liabilities, Carrying Amount
Deposits, Carrying Amount	922,107	1,049,273
Short-term borrowings, Carrying Amount	10,095	13,761
Financial assets, Estimated Fair Value
Investment securities held to maturity, Estimated Fair Value	2,748	2,884
Fair Value, Inputs, Level 2 [Member]
Financial assets, Estimated Fair Value
Cash and cash equivalents, Estimated Fair Value	124,506	200,193
Investment securities held to maturity, Estimated Fair Value	2,748	2,884
Financial liabilities, Estimated Fair Value
Deposits, Estimated Fair Value	924,284	1,052,382
Short-term borrowings, Estimated Fair Value	10,095	13,761
Fair Value, Inputs, Level 3 [Member]
Financial assets, Estimated Fair Value
Loans, net, Estimated Fair Value	$ 792,199	$ 798,381