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Securities - Available for Sale Securities Unrealized Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 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 $ 206,828 $ 63,298
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 7,885 30
Available for sale securities, Losses 12 months or longer, Fair value 485 1,099
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses 9 9
Available for sale securities, Total, Fair value 207,313 64,397
Available for sale securities, Total, Gross Unrealized Losses 7,894 39
US Treasury and government agency securities [Member]
   
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]    
Available for sale securities, Losses 12 months or longer, Fair value 104  
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses 1  
Available for sale securities, Total, Fair value 104  
Available for sale securities, Total, Gross Unrealized Losses 1  
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 13,647 5,278
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 122 14
Available for sale securities, Total, Fair value 13,647 5,278
Available for sale securities, Total, Gross Unrealized Losses 122 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 144,859 57,752
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 6,488 14
Available for sale securities, Losses 12 months or longer, Fair value 379 1,097
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses 7 7
Available for sale securities, Total, Fair value 145,238 58,849
Available for sale securities, Total, Gross Unrealized Losses 6,495 21
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 45,032  
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 1,256  
Available for sale securities, Total, Fair value 45,032  
Available for sale securities, Total, Gross Unrealized Losses 1,256  
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 3,290 268
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 19 2
Available for sale securities, Losses 12 months or longer, Fair value 2 2
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses 1 2
Available for sale securities, Total, Fair value 3,292 270
Available for sale securities, Total, Gross Unrealized Losses $ 20 $ 4