Credit Quality (Details 3) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Schedule of Nonaccrual Loans, Segregated by Class of Loans
Loans on Nonaccrual Status	$ 61,420,000	$ 59,996,000
Owner-occupied [Member]
Schedule of Nonaccrual Loans, Segregated by Class of Loans
Loans on Nonaccrual Status	3,110,000	10,089,000
Nonowner-occupied [Member]
Schedule of Nonaccrual Loans, Segregated by Class of Loans
Loans on Nonaccrual Status	11,052,000	4,810,000
Other commercial [Member]
Schedule of Nonaccrual Loans, Segregated by Class of Loans
Loans on Nonaccrual Status	13,392,000	8,101,000
Residential real estate [Member]
Schedule of Nonaccrual Loans, Segregated by Class of Loans
Loans on Nonaccrual Status	17,784,000	16,569,000
Construction & land development [Member]
Schedule of Nonaccrual Loans, Segregated by Class of Loans
Loans on Nonaccrual Status	15,980,000	20,133,000
Bankcard [Member]
Schedule of Nonaccrual Loans, Segregated by Class of Loans
Loans on Nonaccrual Status	0	0
Other consumer [Member]
Schedule of Nonaccrual Loans, Segregated by Class of Loans
Loans on Nonaccrual Status	$ 102,000	$ 294,000