Loans (Details 12) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012 Contract
Summary of loans modified as troubled debt restructurings within the previous 12-month period
Number of contracts	7
Recorded investment	$ 2,079
Construction, land development, and other land loans [Member]
Summary of loans modified as troubled debt restructurings within the previous 12-month period
Number of contracts	1
Recorded investment	488
Nonfarm nonresidential [Member]
Summary of loans modified as troubled debt restructurings within the previous 12-month period
Number of contracts	5
Recorded investment	1,545
Other loans held for sale [Member]
Summary of loans modified as troubled debt restructurings within the previous 12-month period
Number of contracts
Recorded investment
Loans gross [Member]
Summary of loans modified as troubled debt restructurings within the previous 12-month period
Number of contracts	7
Recorded investment	2,079
Single-family real estate, closed end, [Member]
Summary of loans modified as troubled debt restructurings within the previous 12-month period
Number of contracts	1
Recorded investment	46
Total Commercial real estate [Member]
Summary of loans modified as troubled debt restructurings within the previous 12-month period
Number of contracts	6
Recorded investment	$ 2,033