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Reclassification Adjustments Out of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net securities (gains) losses $ (3) $ (38) $ (43) $ (59)
Interest income 64,245 63,763 189,096 187,854
Salaries and employee benefits 30,227 28,933 91,240 89,609
Income tax expense (benefit) 10,798 5,576 29,745 28,307
Net of tax 19,851 10,912 57,298 56,561
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net of tax 535 (71) 1,605 (60)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net securities (gains) losses (3) (38) (43) (59)
Interest income 328 (99) 999 (99)
Income tax expense (benefit) (127) 55 (372) 64
Net of tax 198 (82) 584 (94)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense (benefit) (214) (8) (652) (23)
Net of tax 337 11 1,021 34
Amortization of Net Gains [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Salaries and employee benefits 566 74 1,697 222
Amortization of Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Salaries and employee benefits $ (15) $ (55) $ (24) $ (165)