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Fair Value Measurements - Recurring and Nonrecurring (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
Carrying Value
Dec. 31, 2011
Carrying Value
Jun. 30, 2012
Level 1
Jun. 30, 2012
Level 2
Jun. 30, 2012
Level 3
Jun. 30, 2012
Fair Value
Dec. 31, 2011
Fair Value
Dec. 31, 2011
Nonrecurring
Jun. 30, 2012
Nonrecurring
Level 1
Dec. 31, 2011
Nonrecurring
Level 1
Jun. 30, 2012
Nonrecurring
Level 2
Dec. 31, 2011
Nonrecurring
Level 2
Jun. 30, 2012
Nonrecurring
Level 3
Dec. 31, 2011
Nonrecurring
Level 3
Jun. 30, 2012
Nonrecurring
Fair Value
Dec. 31, 2011
Nonrecurring
Fair Value
Jun. 30, 2012
Recurring
Level 1
Dec. 31, 2011
Recurring
Level 1
Jun. 30, 2012
Recurring
Level 2
Dec. 31, 2011
Recurring
Level 2
Jun. 30, 2012
Recurring
Level 3
Dec. 31, 2011
Recurring
Level 3
Jun. 30, 2012
Recurring
Fair Value
Dec. 31, 2011
Recurring
Fair Value
Dec. 31, 2011
U.S. Government agencies
Recurring
Level 1
Dec. 31, 2011
U.S. Government agencies
Recurring
Level 2
Dec. 31, 2011
U.S. Government agencies
Recurring
Level 3
Dec. 31, 2011
U.S. Government agencies
Recurring
Fair Value
Jun. 30, 2012
Obligations of states and political subdivisions
Recurring
Level 1
Dec. 31, 2011
Obligations of states and political subdivisions
Recurring
Level 1
Jun. 30, 2012
Obligations of states and political subdivisions
Recurring
Level 2
Dec. 31, 2011
Obligations of states and political subdivisions
Recurring
Level 2
Jun. 30, 2012
Obligations of states and political subdivisions
Recurring
Level 3
Dec. 31, 2011
Obligations of states and political subdivisions
Recurring
Level 3
Jun. 30, 2012
Obligations of states and political subdivisions
Recurring
Fair Value
Dec. 31, 2011
Obligations of states and political subdivisions
Recurring
Fair Value
Jun. 30, 2012
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 1
Dec. 31, 2011
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 1
Jun. 30, 2012
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 2
Dec. 31, 2011
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 2
Jun. 30, 2012
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 3
Dec. 31, 2011
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Level 3
Jun. 30, 2012
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Fair Value
Dec. 31, 2011
U.S. Government agencies collateralized by residential mortgage obligations
Recurring
Fair Value
Jun. 30, 2012
Private label residential mortgage backed securities
Recurring
Level 1
Dec. 31, 2011
Private label residential mortgage backed securities
Recurring
Level 1
Jun. 30, 2012
Private label residential mortgage backed securities
Recurring
Level 2
Dec. 31, 2011
Private label residential mortgage backed securities
Recurring
Level 2
Jun. 30, 2012
Private label residential mortgage backed securities
Recurring
Level 3
Dec. 31, 2011
Private label residential mortgage backed securities
Recurring
Level 3
Jun. 30, 2012
Private label residential mortgage backed securities
Recurring
Fair Value
Dec. 31, 2011
Private label residential mortgage backed securities
Recurring
Fair Value
Jun. 30, 2012
Other equity securities
Recurring
Level 1
Dec. 31, 2011
Other equity securities
Recurring
Level 1
Jun. 30, 2012
Other equity securities
Recurring
Level 2
Dec. 31, 2011
Other equity securities
Recurring
Level 2
Jun. 30, 2012
Other equity securities
Recurring
Level 3
Dec. 31, 2011
Other equity securities
Recurring
Level 3
Jun. 30, 2012
Other equity securities
Recurring
Fair Value
Dec. 31, 2011
Other equity securities
Recurring
Fair Value
Jun. 30, 2012
Impaired loans
Dec. 31, 2011
Impaired loans
Dec. 31, 2011
Impaired loans
Nonrecurring
Jun. 30, 2012
Impaired loans
Nonrecurring
Carrying Value
Dec. 31, 2011
Impaired loans
Nonrecurring
Carrying Value
Jun. 30, 2012
Impaired loans
Nonrecurring
Level 1
Dec. 31, 2011
Impaired loans
Nonrecurring
Level 1
Jun. 30, 2012
Impaired loans
Nonrecurring
Level 2
Dec. 31, 2011
Impaired loans
Nonrecurring
Level 2
Jun. 30, 2012
Impaired loans
Nonrecurring
Level 3
Dec. 31, 2011
Impaired loans
Nonrecurring
Level 3
Jun. 30, 2012
Impaired loans
Nonrecurring
Fair Value
Dec. 31, 2011
Impaired loans
Nonrecurring
Fair Value
Jun. 30, 2012
Impaired loans
Commercial and industrial
Nonrecurring
Level 3
Jun. 30, 2012
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 3
Jun. 30, 2012
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 3
Jun. 30, 2012
Commercial
Mar. 31, 2012
Commercial
Dec. 31, 2011
Commercial
Jun. 30, 2011
Commercial
Mar. 31, 2011
Commercial
Dec. 31, 2010
Commercial
Dec. 31, 2011
Commercial
Impaired loans
Nonrecurring
Jun. 30, 2012
Commercial
Impaired loans
Nonrecurring
Level 1
Dec. 31, 2011
Commercial
Impaired loans
Nonrecurring
Level 1
Jun. 30, 2012
Commercial
Impaired loans
Nonrecurring
Level 2
Dec. 31, 2011
Commercial
Impaired loans
Nonrecurring
Level 2
Jun. 30, 2012
Commercial
Impaired loans
Nonrecurring
Level 3
Dec. 31, 2011
Commercial
Impaired loans
Nonrecurring
Level 3
Jun. 30, 2012
Commercial
Impaired loans
Nonrecurring
Fair Value
Dec. 31, 2011
Commercial
Impaired loans
Nonrecurring
Fair Value
Dec. 31, 2011
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Jun. 30, 2012
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 1
Dec. 31, 2011
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 1
Jun. 30, 2012
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 2
Dec. 31, 2011
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 2
Jun. 30, 2012
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 3
Dec. 31, 2011
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Level 3
Jun. 30, 2012
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Fair Value
Dec. 31, 2011
Commercial
Impaired loans
Commercial and industrial
Nonrecurring
Fair Value
Dec. 31, 2011
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Dec. 31, 2011
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Level 1
Dec. 31, 2011
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Level 2
Dec. 31, 2011
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Level 3
Dec. 31, 2011
Commercial
Impaired loans
Agricultural land and production
Nonrecurring
Fair Value
Jun. 30, 2012
Real Estate Portfolio Segment
Mar. 31, 2012
Real Estate Portfolio Segment
Dec. 31, 2011
Real Estate Portfolio Segment
Jun. 30, 2011
Real Estate Portfolio Segment
Mar. 31, 2011
Real Estate Portfolio Segment
Dec. 31, 2010
Real Estate Portfolio Segment
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Jun. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 1
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 1
Jun. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 2
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 2
Jun. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 3
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Level 3
Jun. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Fair Value
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Nonrecurring
Fair Value
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Level 1
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Level 2
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Level 3
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Owner occupied
Nonrecurring
Fair Value
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Jun. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 1
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 1
Jun. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 2
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 2
Jun. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 3
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Level 3
Jun. 30, 2012
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Fair Value
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Real estate construction and other land loans
Nonrecurring
Fair Value
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Level 1
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Level 2
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Level 3
Dec. 31, 2011
Real Estate Portfolio Segment
Impaired loans
Commercial real estate
Nonrecurring
Fair Value
Jun. 30, 2012
Consumer
Mar. 31, 2012
Consumer
Dec. 31, 2011
Consumer
Jun. 30, 2011
Consumer
Mar. 31, 2011
Consumer
Dec. 31, 2010
Consumer
Dec. 31, 2011
Consumer
Impaired loans
Nonrecurring
Jun. 30, 2012
Consumer
Impaired loans
Nonrecurring
Level 1
Dec. 31, 2011
Consumer
Impaired loans
Nonrecurring
Level 1
Jun. 30, 2012
Consumer
Impaired loans
Nonrecurring
Level 2
Dec. 31, 2011
Consumer
Impaired loans
Nonrecurring
Level 2
Jun. 30, 2012
Consumer
Impaired loans
Nonrecurring
Level 3
Dec. 31, 2011
Consumer
Impaired loans
Nonrecurring
Level 3
Jun. 30, 2012
Consumer
Impaired loans
Nonrecurring
Fair Value
Dec. 31, 2011
Consumer
Impaired loans
Nonrecurring
Fair Value
Dec. 31, 2011
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Jun. 30, 2012
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 1
Dec. 31, 2011
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 1
Jun. 30, 2012
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 2
Dec. 31, 2011
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 2
Jun. 30, 2012
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 3
Dec. 31, 2011
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Level 3
Jun. 30, 2012
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Fair Value
Dec. 31, 2011
Consumer
Impaired loans
Equity loans and lines of credit
Nonrecurring
Fair Value
Dec. 31, 2011
Consumer
Impaired loans
Consumer and installment
Nonrecurring
Dec. 31, 2011
Consumer
Impaired loans
Consumer and installment
Nonrecurring
Level 1
Dec. 31, 2011
Consumer
Impaired loans
Consumer and installment
Nonrecurring
Level 2
Dec. 31, 2011
Consumer
Impaired loans
Consumer and installment
Nonrecurring
Level 3
Dec. 31, 2011
Consumer
Impaired loans
Consumer and installment
Nonrecurring
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                                                                                                                                                                                                                                                                                            
Available-for-sale investment securities             $ 322,931 $ 328,413 $ 7,976 $ 314,955 $ 0 $ 322,931 $ 328,413                                   $ 0 $ 149 $ 0 $ 149 $ 0 $ 0 $ 115,814 $ 108,431 $ 0 $ 0 $ 115,814 $ 108,431 $ 0 $ 0 $ 192,472 $ 204,544 $ 0 $ 0 $ 192,472 $ 204,544 $ 0 $ 0 $ 6,669 $ 7,398 $ 0 $ 0 $ 6,669 $ 7,398 $ 7,976 $ 7,891 $ 0 $ 0 $ 0 $ 0 $ 7,976 $ 7,891                                                                                                                                                                                                                        
Loans receivable             404,203 415,999 0 0 404,978 404,978 418,084                                                                                                                 11,971 19,876 0 0 0 0 9,800 15,508 9,800 15,508 923 8,671 206               0 0 0 0 923 2,312 923 2,312   0 0 0 0 923 2,312 923 2,312   0 0 0 0               0 0 0 0 8,671 11,142 8,671 11,142   0 0 873 873   0 0 0 0 8,671 8,782 8,671 8,782   0 0 1,487 1,487               0 0 0 0 206 2,054 206 2,054   0 0 0 0 206 2,003 206 2,003   0 0 51 51
Other Real Estate Owned, Fair Value Disclosure                             0   0   2,098   2,098                                                                                                                                                                                                                                                                                                                  
Assets, fair value                             0 0 0 0 11,898 15,508 11,898 15,508 7,976 7,891 314,955 320,522 0 0 322,931 328,413                                                                                                                                                                                                                                                                                                
Total Gains (Losses) in the Period                           (2,717)                                                                                                             (2,717)                                       (271)                 (271)                 0                     (2,427)                 (65)         (996)                 (1,366)                     (19)                 4                 (23)        
Valuation allowance $ 10,140 $ 10,285 $ 11,396 $ 11,035 $ 11,019 $ 11,014                                                                                                                         $ 2,171 $ 4,368                             $ 2,799 $ 2,714 $ 2,266 $ 3,010 $ 2,960 $ 2,437                                               $ 5,474 $ 5,140 $ 7,155 $ 5,805 $ 6,536 $ 5,836                                                         $ 1,494 $ 2,142 $ 1,836 $ 915 $ 998 $ 2,503