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Fair Value (Additional Information) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Loan held for sale, at fair value $ 6,410,000   $ 6,410,000   $ 6,311,000
Contractual principal balance of Loan held for sale 6,290,000   6,290,000   6,227,000
Difference in amount of loan held for sale 120,000   120,000   84,000
Valuation allowance for loans losses 1,688,000   1,688,000   1,542,000
Cost of real estate sales 0 $ 83,000 0 $ 83,000  
Other real estate, carrying value 0   0   68,000
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 625,144,000   625,144,000   630,995,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 9,359,000   9,359,000   10,494,000
Obligations of State and Political Subdivisions          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Total Gains or (Losses) (realized/unrealized) Included in Other Comprehensive Income 25,000 (12,000) (20,000) 143,000  
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 193,342,000   193,342,000   153,777,000
Total Gains or (Losses) (realized/unrealized) Included in Other Comprehensive Income 25,000 (12,000) (20,000) 143,000  
Obligations of State and Political Subdivisions | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 9,006,000   9,006,000   10,141,000
Equity Securities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Total Gains or (Losses) (realized/unrealized) Included in Earnings   0 0 0  
Equity Securities | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 353,000   353,000   353,000
Total Gains or (Losses) (realized/unrealized) Included in Other Comprehensive Income 0 0 0 0  
Equity Securities | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 353,000   353,000   353,000
Commercial Real Estate          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Impaired loans, carrying amount 3,467,000   3,467,000   3,043,000
Valuation allowance for loans losses 1,655,000   1,655,000   1,539,000
Provision for loan losses $ 78,000   $ 113,000   $ 261,000
Provision for loan lease and other losses   $ 30,000   $ 187,000