Loans and Asset Quality Information (Details Narrative) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unamortized premiums on loans	$ 485,000	$ 949,000
Loans pledged as collateral	2,100,000,000
Loans to officers and directors	6,900,000	5,300,000
Additions to loans, officers and directors	3,600,000
Repayments of loans, officers and directors	2,000,000
Accretion of loan discount	16,466,000	11,598,000
Percentage of loan discount accretion	80.00%
Partial charge-offs on purchased loans outstanding	22,441,000
Chargeoffs to write-down the TDRs	6,000,000
Reclassification TDR to nonperforming loans held for sale	5,000,000
Reclassification of perfoming loans to TDR status	30,000,000
Number of covered loans - Subsequent Default	3
Subsequently covered loans defaulted - Recorded Investment	400,000
Nonaccrual Loans
Interest Income	7,689,000	8,724,000	8,136,000
Interest income, actually collected	2,824,000	2,578,000	3,195,000
Restructured Loans
Interest Income	2,392,000	1,873,000	1,943,000
Interest income, actually collected	1,179,000	1,351,000	1,342,000
Purchased Nonimpaired Loans
Loan discount on loans	56,515,000
Purchased Nonperfoming Loans
Loan discount on loans	$ 18,406,000