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Fair Value Measurements - Recurring and Nonrecurring (Details) (USD $)
Sep. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Valuation allowance $ 10,214,000 $ 10,140,000 $ 11,396,000 $ 11,031,000 $ 11,035,000 $ 11,014,000
Carrying Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 364,808,000   328,413,000      
Loans receivable 388,922,000   415,999,000      
Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 8,040,000          
Loans receivable 0          
Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 356,768,000          
Loans receivable 0          
Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0          
Loans receivable 392,854,000          
Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 364,808,000   328,413,000      
Loans receivable 392,854,000   418,084,000      
Nonrecurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value     0      
Nonrecurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value     0      
Nonrecurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value     15,508,000      
Nonrecurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value     15,508,000      
Recurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 8,040,000   7,891,000      
Recurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 356,768,000   320,522,000      
Recurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 0   0      
Recurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 364,808,000   328,413,000      
U.S. Government agencies | Recurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
U.S. Government agencies | Recurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 2,318,000   149,000      
U.S. Government agencies | Recurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
U.S. Government agencies | Recurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 2,318,000   149,000      
Obligations of states and political subdivisions | Recurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Obligations of states and political subdivisions | Recurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 137,637,000   108,431,000      
Obligations of states and political subdivisions | Recurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Obligations of states and political subdivisions | Recurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 137,637,000   108,431,000      
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 210,135,000   204,544,000      
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
U.S. Government agencies collateralized by residential mortgage obligations | Recurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 210,135,000   204,544,000      
Private label residential mortgage backed securities | Recurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Private label residential mortgage backed securities | Recurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 6,678,000   7,398,000      
Private label residential mortgage backed securities | Recurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Private label residential mortgage backed securities | Recurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 6,678,000   7,398,000      
Other equity securities | Recurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 8,040,000   7,891,000      
Other equity securities | Recurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Other equity securities | Recurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 0   0      
Other equity securities | Recurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale investment securities 8,040,000   7,891,000      
Impaired loans
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Valuation allowance     4,368,000      
Impaired loans | Nonrecurring | Carrying Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     19,876,000      
Impaired loans | Nonrecurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Impaired loans | Nonrecurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Impaired loans | Nonrecurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     15,508,000      
Impaired loans | Nonrecurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     15,508,000      
Commercial
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Valuation allowance 2,678,000 2,799,000 2,266,000 2,778,000 2,926,000 2,437,000
Commercial | Impaired loans | Nonrecurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Commercial | Impaired loans | Nonrecurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Commercial | Impaired loans | Nonrecurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     2,312,000      
Commercial | Impaired loans | Nonrecurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     2,312,000      
Commercial | Impaired loans | Commercial and industrial | Nonrecurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Commercial | Impaired loans | Commercial and industrial | Nonrecurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Commercial | Impaired loans | Commercial and industrial | Nonrecurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     2,312,000      
Commercial | Impaired loans | Commercial and industrial | Nonrecurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     2,312,000      
Real Estate Portfolio Segment
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Valuation allowance 6,006,000 5,474,000 7,155,000 6,362,000 5,508,000 5,836,000
Real Estate Portfolio Segment | Impaired loans | Nonrecurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Real Estate Portfolio Segment | Impaired loans | Nonrecurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Real Estate Portfolio Segment | Impaired loans | Nonrecurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     11,142,000      
Real Estate Portfolio Segment | Impaired loans | Nonrecurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     11,142,000      
Real Estate Portfolio Segment | Impaired loans | Owner occupied | Nonrecurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Real Estate Portfolio Segment | Impaired loans | Owner occupied | Nonrecurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Real Estate Portfolio Segment | Impaired loans | Owner occupied | Nonrecurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     873,000      
Real Estate Portfolio Segment | Impaired loans | Owner occupied | Nonrecurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     873,000      
Real Estate Portfolio Segment | Impaired loans | Real estate construction and other land loans | Nonrecurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Real Estate Portfolio Segment | Impaired loans | Real estate construction and other land loans | Nonrecurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Real Estate Portfolio Segment | Impaired loans | Real estate construction and other land loans | Nonrecurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     8,782,000      
Real Estate Portfolio Segment | Impaired loans | Real estate construction and other land loans | Nonrecurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     8,782,000      
Real Estate Portfolio Segment | Impaired loans | Commercial real estate | Nonrecurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Real Estate Portfolio Segment | Impaired loans | Commercial real estate | Nonrecurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Real Estate Portfolio Segment | Impaired loans | Commercial real estate | Nonrecurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     1,487,000      
Real Estate Portfolio Segment | Impaired loans | Commercial real estate | Nonrecurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     1,487,000      
Consumer
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Valuation allowance 1,511,000 1,494,000 1,836,000 1,662,000 1,296,000 2,503,000
Consumer | Impaired loans | Nonrecurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Consumer | Impaired loans | Nonrecurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Consumer | Impaired loans | Nonrecurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     2,054,000      
Consumer | Impaired loans | Nonrecurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     2,054,000      
Consumer | Impaired loans | Equity loans and lines of credit | Nonrecurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Consumer | Impaired loans | Equity loans and lines of credit | Nonrecurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Consumer | Impaired loans | Equity loans and lines of credit | Nonrecurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     2,003,000      
Consumer | Impaired loans | Equity loans and lines of credit | Nonrecurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     2,003,000      
Consumer | Impaired loans | Consumer and installment | Nonrecurring | Level 1
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Consumer | Impaired loans | Consumer and installment | Nonrecurring | Level 2
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     0      
Consumer | Impaired loans | Consumer and installment | Nonrecurring | Level 3
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     51,000      
Consumer | Impaired loans | Consumer and installment | Nonrecurring | Fair Value
           
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Loans receivable     $ 51,000