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Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]        
Net income $ 19,851 $ 10,912 $ 57,298 $ 56,561
Other comprehensive (loss) income, net of tax:        
Unrealized net holding gains (losses) arising during the period (pre-tax amounts of $3,801, (3,693), $3,367 and $13,199) 2,323 (2,124) 2,057 8,075
Reclassification adjustment for net gains related to securities available for sale included in net income (pre-tax amounts of $3, $38, $43 and $59) (2) (23) (26) (35)
Amortization of unrealized net gains and losses related to the reclassification of available for sale investment securities to held to maturity (pre-tax amounts of $328, ($99), $999 and ($99)) 200 (59) 610 (59)
Pension and other benefits:        
Amortization of prior service cost and actuarial gains (pre-tax amounts of $551, $19, $1,673 and $57) 337 11 1,021 34
Total other comprehensive (loss) income 2,858 (2,195) 3,662 8,015
Comprehensive income $ 22,709 $ 8,717 $ 60,960 $ 64,576