Subsequent Event Subsequent Event (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Subsequent Event [Line Items]
Total assets	$ 7,747,440	$ 7,187,906
Gross loans	3,397,425	3,466,135
Total deposits	5,364,461	4,821,213
First State Bank [Member]
Subsequent Event [Line Items]
Total assets	281,000
Gross loans	179,000
Total deposits	$ 249,000