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Securities - Available for Sale Securities Unrealized Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available for sale securities, Losses less than 12 months, Fair Value $ 52,127 $ 530,697
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 38 3,000
Available for sale securities, Losses 12 months or longer, Fair value 2,525 339
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses 20 6
Available for sale securities, Total, Fair value 54,652 531,036
Available for sale securities, Total, Gross Unrealized Losses 58 3,006
Municipal Obligation [Member]
   
Available for sale securities, Losses less than 12 months, Fair Value 545 18,854
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 3 42
Available for sale securities, Losses 12 months or longer, Fair value 960  
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses 1  
Available for sale securities, Total, Fair value 1,505 18,854
Available for sale securities, Total, Gross Unrealized Losses 4 42
Mortgage-backed securities [Member]
   
Available for sale securities, Losses less than 12 months, Fair Value 1,587 212,900
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 2 692
Available for sale securities, Losses 12 months or longer, Fair value 1,348 337
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses 9 4
Available for sale securities, Total, Fair value 2,935 213,237
Available for sale securities, Total, Gross Unrealized Losses 11 696
CMOs [Member]
   
Available for sale securities, Losses less than 12 months, Fair Value 49,995 296,860
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses 33 2,193
Available for sale securities, Total, Fair value 49,995 296,860
Available for sale securities, Total, Gross Unrealized Losses 33 2,193
Corporate debt securities [Member]
   
Available for sale securities, Losses less than 12 months, Fair Value   398
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses   34
Available for sale securities, Total, Fair value   398
Available for sale securities, Total, Gross Unrealized Losses   34
Equity securities [Member]
   
Available for sale securities, Losses less than 12 months, Fair Value   1,685
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses   39
Available for sale securities, Losses 12 months or longer, Fair value 217 2
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses 10 2
Available for sale securities, Total, Fair value 217 1,687
Available for sale securities, Total, Gross Unrealized Losses $ 10 $ 41