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Fair Value (Additional Information) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Loan held for sale, at fair value $ 9,844,000   $ 9,844,000   $ 15,273,000
Contractual principal balance of Loan held for sale 9,622,000   9,622,000   14,983,000
Difference in amount of loan held for sale 222,000   222,000   290,000
Impaired loans, carrying amount 1,711,000   1,711,000   1,575,000
Valuation allowance for loans losses 315,000   315,000   355,000
Cost of real estate sales   $ 0 0   75,000
Other real estate, carrying value 0   0   0
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 740,578,000   740,578,000   709,786,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 6,817,000   6,817,000   7,648,000
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 17,000 17,000 34,000 $ 38,000  
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 266,987,000   266,987,000   247,519,000
Total gains/loss included in earnings attributable to other changes in fair value 17,000 17,000 34,000 38,000  
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 6,464,000   6,464,000   7,295,000
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/loss included in earnings attributable to other changes in fair value 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 Loans          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Impaired loans, carrying amount 865,000   865,000   663,000
Valuation allowance for loans losses 260,000   260,000   255,000
Increase (decrease) to provision for loan losses $ (273,000) $ (5,000) $ 5,000 $ (8,000) $ 115,000