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Comprehensive Income - Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Components Of Comprehensive Income [Line Items]    
Beginning balance $ (105,797) $ (395,657)
Unrealized holding gains (losses), net 62,087 5,581
Foreign currency translation adjustment (234) (1,452)
Total other comprehensive income before reclassifications 61,853 4,129
Accretion of unrealized holding losses on held-to-maturity ("HTM") securities 825 1,195
OTTI charges recognized in net income   9,800
Amortization of prior service credit (2,000) (2,000)
Amortization of actuarial losses 3,350 10,500
Total reclassifications 2,175 19,495
Total gain (loss) during the period 64,028 23,624
Ending balance (41,769) (372,033)
Beginning balance 41,638 155,393
Unrealized holding gains (losses), net (24,374) (2,181)
Foreign currency translation adjustment 98 520
Total other comprehensive income before reclassifications (24,276) (1,661)
Accretion of unrealized holding losses on held-to-maturity ("HTM") securities (324) (469)
OTTI charges recognized in net income   (3,847)
Amortization of prior service credit 785 785
Amortization of actuarial losses (1,315) (4,121)
Total reclassifications (854) (7,652)
Total gain (loss) during the period (25,130) (9,313)
Ending balance 16,508 146,080
Beginning balance (64,159) (240,264)
Unrealized holding gains (losses), net 37,713 3,400
Foreign currency translation adjustment (136) (932)
Total other comprehensive income before reclassifications 37,577 2,468
Accretion of unrealized holding losses on held-to-maturity ("HTM") securities 501 726
OTTI charges recognized in net income   5,953
Amortization of prior service credit (1,215) (1,215)
Amortization of actuarial losses 2,035 6,379
Total reclassifications 1,321 11,843
Total gain (loss) during the period 38,898 14,311
Ending Balance (25,261) (225,953)
Investment Securities With OTTI [Member]
   
Components Of Comprehensive Income [Line Items]    
Beginning balance 37,255 (91,835)
Unrealized holding gains (losses), net 19,968 24,540
Foreign currency translation adjustment      
Total other comprehensive income before reclassifications 19,968 24,540
Accretion of unrealized holding losses on held-to-maturity ("HTM") securities 2 49
OTTI charges recognized in net income   9,800
Amortization of prior service credit      
Amortization of actuarial losses      
Total reclassifications 2 9,849
Total gain (loss) during the period 19,970 34,389
Ending balance 57,225 (57,446)
Investment Securities All Other [Member]
   
Components Of Comprehensive Income [Line Items]    
Beginning balance 18,450 152,199
Unrealized holding gains (losses), net 42,119 (18,959)
Foreign currency translation adjustment      
Total other comprehensive income before reclassifications 42,119 (18,959)
Accretion of unrealized holding losses on held-to-maturity ("HTM") securities 823 1,146
OTTI charges recognized in net income     
Amortization of prior service credit      
Amortization of actuarial losses      
Total reclassifications 823 1,146
Total gain (loss) during the period 42,942 (17,813)
Ending balance 61,392 134,386
Defined Benefit Plans [Member]
   
Components Of Comprehensive Income [Line Items]    
Beginning balance (161,617) (455,590)
Unrealized holding gains (losses), net      
Foreign currency translation adjustment      
Total other comprehensive income before reclassifications      
Accretion of unrealized holding losses on held-to-maturity ("HTM") securities      
OTTI charges recognized in net income     
Amortization of prior service credit (2,000) (2,000)
Amortization of actuarial losses 3,350 10,500
Total reclassifications 1,350 8,500
Total gain (loss) during the period 1,350 8,500
Ending balance (160,267) (447,090)
Beginning balance (98,182)  
Total gain (loss) during the period 820  
Ending Balance (97,362)  
Other [Member]
   
Components Of Comprehensive Income [Line Items]    
Beginning balance 115 (431)
Unrealized holding gains (losses), net      
Foreign currency translation adjustment (234) (1,452)
Total other comprehensive income before reclassifications (234) (1,452)
Accretion of unrealized holding losses on held-to-maturity ("HTM") securities      
OTTI charges recognized in net income     
Amortization of prior service credit      
Amortization of actuarial losses      
Total reclassifications      
Total gain (loss) during the period (234) (1,452)
Ending balance $ (119) $ (1,883)