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Reclassification Adjustments Out of Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net securities gains $ (3,087) $ (92) $ (1,426)
Interest income (252,608) (251,878) (238,079)
Salaries and employee benefits 124,318 119,667 113,580
Income tax expense 40,203 37,229 28,196
Net Income 76,425 75,074 $ 61,747
Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total reclassification during the period, net of tax 286 247  
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense 691 (128)  
Net Income (1,085) 201  
Gains on Available for Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net securities gains (3,087) (92)  
Amortization of Unrealized Gains and Losses Related to Securities Transfer [Member] | Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Interest income 1,311 421  
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax expense 868 29  
Net Income 1,371 46  
Amortization of Net Gains [Member] | Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Salaries and employee benefits 2,437 94  
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Salaries and employee benefits $ (198) $ (19)