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Securities - Available for Sale Securities Unrealized Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]    
Available for sale securities, Losses less than 12 months, Fair Value $ 1,315,198 $ 63,298
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 51,698 30
Available for sale securities, Losses 12 months or longer, Fair value 630 1,099
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses 12 9
Available for sale securities, Total, Fair value 1,315,828 64,397
Available for sale securities, Total, Gross Unrealized Losses 51,710 39
Municipal obligations [Member]
   
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]    
Available for sale securities, Losses less than 12 months, Fair Value 13,683 5,278
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 96 14
Available for sale securities, Losses 12 months or longer, Fair value      
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses      
Available for sale securities, Total, Fair value 13,683 5,278
Available for sale securities, Total, Gross Unrealized Losses 96 14
Mortgage-backed securities [Member]
   
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]    
Available for sale securities, Losses less than 12 months, Fair Value 1,115,242 57,752
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 45,503 14
Available for sale securities, Losses 12 months or longer, Fair value 627 1,097
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses 11 7
Available for sale securities, Total, Fair value 1,115,869 58,849
Available for sale securities, Total, Gross Unrealized Losses 45,514 21
Equity securities [Member]
   
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]    
Available for sale securities, Losses less than 12 months, Fair Value 3,284 268
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 24 2
Available for sale securities, Losses 12 months or longer, Fair value 3 2
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses 1 2
Available for sale securities, Total, Fair value 3,287 270
Available for sale securities, Total, Gross Unrealized Losses 25 4
Collateralized mortgage obligations [Member]
   
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]    
Available for sale securities, Losses less than 12 months, Fair Value 182,989  
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 6,075  
Available for sale securities, Losses 12 months or longer, Fair value     
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses     
Available for sale securities, Total, Fair value 182,989  
Available for sale securities, Total, Gross Unrealized Losses $ 6,075