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Stockholders' Equity - Summary of Items in Consolidated Income Statements Affected by Amounts Reclassified From Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Other Comprehensive Income Loss Amount Reclassified From Accumulated Other Comprehensive Income [Abstract]        
Reclassification adjustment for net gains and losses realized and included in earnings $ 1,553 $ 842 $ 5,835 $ 4,371
Tax effect       325
Net of tax       604
Amortization/accretion of unrealized net gain/loss on securities transferred to HTM 1,456 2,725 7,099 5,645
Tax effect     2,563 2,122
Net of tax     4,536 3,523
Amortization of defined benefit pension and post-retirement items     (5,534) (5,260)
Tax effect     (2,070) (1,971)
Net of tax     (3,464) (3,289)
Gains and losses on cash flow hedges     (301) (40)
Tax effect     (105) (14)
Net of tax     (196) (26)
Total reclassifications, net of tax     $ 876 $ 812