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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Fair value of financial assets and liabilities measured on recurring basis      
Securities available for sale $ 523,706   $ 584,369
Derivative assets 4,175   7,590
Derivative liabilities 1,868   6,017
Loans held for sale 15,479 12,126 13,066
Mortgage servicing intangibles 844   1,270
Level 1 Inputs [Member]
     
Fair value of financial assets and liabilities measured on recurring basis      
Securities available for sale     30,036
Level 2 Inputs [Member]
     
Fair value of financial assets and liabilities measured on recurring basis      
Securities available for sale 513,350   541,662
Derivative assets 4,175   7,590
Derivative liabilities 1,868   6,017
Loans held for sale 15,479   13,066
Level 3 Inputs [Member]
     
Fair value of financial assets and liabilities measured on recurring basis      
Securities available for sale 10,356   12,671
Mortgage servicing intangibles $ 844   $ 1,270