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Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]        
Net income $ 20,001 $ 19,851 $ 58,801 $ 57,298
Other comprehensive income, net of tax        
Unrealized net holding (losses) gains arising during the period (pre-tax amounts of ($2,931), $3,801, $14,010 and $3,367) (1,790) 2,323 8,560 2,057
Reclassification adjustment for net gains related to securities available for sale included in net income (pre-tax amounts of $-, $3, $30 and $43) 0 (2) (19) (26)
Unrealized losses on derivatives (cash flow hedges) (pre-tax amounts of $782, $-, $719 and $-) 478 0 439 0
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 $267, $328, $843 and $999) 162 200 515 610
Pension and other benefits:        
Amortization of prior service cost and actuarial gains (pre-tax amounts of $519, $551, $1,544 and $1,673) 317 337 943 1,021
Total other comprehensive (loss) income (833) 2,858 10,438 3,662
Comprehensive income $ 19,168 $ 22,709 $ 69,239 $ 60,960