Fair Values of Assets and Liabilities (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of assets measured on non-recurring basis
Total Assets	$ 1,212,738	$ 1,212,048
Fair Value, Inputs, Level 1 [Member]
Schedule of assets measured on non-recurring basis
Total Assets	440	440
Fair Value, Inputs, Level 2 [Member]
Schedule of assets measured on non-recurring basis
Total Assets	1,189,086	1,173,796
Fair Value, Inputs, Level 3 [Member]
Schedule of assets measured on non-recurring basis
Total Assets	23,212	37,812
Fair Value, Measurements, Non-recurring [Member]
Schedule of assets measured on non-recurring basis
Impaired loans	73,209	100,132
Other real estate owned	19,603	31,670
Total Assets	92,812	131,802
Fair Value, Measurements, Non-recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Schedule of assets measured on non-recurring basis
Impaired loans	0	0
Other real estate owned	0	0
Total Assets	0	0
Fair Value, Measurements, Non-recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Schedule of assets measured on non-recurring basis
Impaired loans	50,473	73,783
Other real estate owned	19,250	31,232
Total Assets	69,723	105,015
Fair Value, Measurements, Non-recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Schedule of assets measured on non-recurring basis
Impaired loans	22,736	26,349
Other real estate owned	353	438
Total Assets	$ 23,089	$ 26,787