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Fair Value (Additional Information) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Impaired loans, carrying amount [1]         $ 7,229,000
Valuation allowance for impaired loans         3,371,000
Other real estate carried at fair value less cost to sell $ 0   $ 0   0
Other real estate, adjustments to carrying value less costs to charged to earnings 0 $ 0 0 $ 0 0
Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 962,270,000   962,270,000   854,825,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 2,495,000   2,495,000   4,021,000
Loans Held-for-sale          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gains/(losses) from changes in fair value included in earnings 92,000 93,000 97,000 227,000  
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities 412,117,000   412,117,000   324,300,000
Gains/(losses) from changes in fair value included in other comprehensive income (7,000) $ (6,000) (23,000) $ (15,000)  
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 2,495,000   2,495,000   4,021,000
Collateral-dependent loans          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Impaired loans, carrying amount 17,000,000   17,000,000   5,574,000
Valuation allowance for impaired loans 8,313,000   8,313,000   2,971,000
Collateral-dependent loans | Individually Analyzed Loans          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Increase (decrease) in allowance for loan losses $ (163,000)   $ 1,686,000   $ (1,149,000)
[1] Total recorded investment in loans includes $13,929 in accrued interest.