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Reclassifications Out Of Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2016
Reclassifications Out Of Accumulated Other Comprehensive Income [Abstract]  
Summary Of Reclassifications Out Of Accumulated Other Comprehensive Income
                    Affected Line Item in the
                    Statement Where Net
    2016     2015     2014   Income is Presented
 
Realized gains and losses on                    
available-for-sale securities $ 4,498   $ 1,334   $ 400   Net securities gains
Tax (expense) or benefit   (1,574 )   (467 )   (138 ) Provision for income taxes
Net of tax $ 2,924   $ 867   $ 262   Net income
 
Amortization of prior service cost and actuarial (loss)                    
gain for supplemental executive retirement plan $ (28 ) $ (38 ) $ (25 ) Salaries and benefits
Tax (expense) or benefit   10     13   --   Provision for income taxes
Net of tax $ (18 ) $ (25 ) $ (25 ) Net income
Total reclassification for the period $ 2,906   $ 842   $ 237