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Fair Value (Additional Information) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loan held for sale, at fair value $ 8,700,000   $ 10,762,000
Contractual principal balance of Loan held for sale 8,498,000   10,559,000
Difference in amount of loan held for sale 202,000   203,000
Impaired loans, carrying amount [1] 2,433,000   3,610,000
Valuation allowance for loans losses 1,168,000   1,202,000
Cost of real estate sales 0 $ 0 0
Other real estate, carrying value 0   0
Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Securities 715,611,000   637,840,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Securities 8,649,000   9,373,000
Obligations of State and Political Subdivisions      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total gains/loss included in earnings attributable to other changes in fair value 121,000 36,000  
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Securities 236,283,000   203,628,000
Total gains/loss included in earnings attributable to other changes in fair value 121,000 36,000  
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 8,296,000   9,020,000
Equity Securities      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total gains/loss included in earnings attributable to interest income 0 0  
Equity Securities | Fair Value, Measurements, Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Securities 353,000   353,000
Total gains/loss included in earnings attributable to other changes in fair value 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
Commercial Real Estate      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Impaired loans, carrying amount 2,282,000   2,148,000
Valuation allowance for loans losses 1,168,000   1,173,000
Provision for loan losses $ (5,000) $ 37,000 $ (286,000)
[1] Unpaid Principal Balance is the remaining contractual payments gross of partial charge-offs.