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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net securities gains $ 0 $ 3 $ 30 $ 43
Interest income 66,662 64,245 197,016 189,096
Salaries and employee benefits 32,783 30,227 98,155 91,240
Income tax expense (10,303) (10,798) (30,291) (29,745)
Net income 20,001 19,851 58,801 57,298
Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income 479 535 1,439 1,605
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]        
Net securities gains 0 (3) (30) (43)
Interest income 267 328 843 999
Income tax expense (105) (127) (317) (372)
Net income 162 198 496 584
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 (202) (214) (601) (652)
Net income 317 337 943 1,021
Amortization of Net Losses [Member] | Reclassification out of Accumulated Other Comprehensive (Loss) Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Salaries and employee benefits 565 566 1,595 1,697
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 $ (46) $ (15) $ (51) $ (24)