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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair value of financial assets and liabilities measured on recurring basis    
Securities available for sale $ 546,126 $ 592,500
Derivative assets 3,521 7,082
Derivative liabilities 1,801 5,420
Loans held for sale 13,661 12,126
Mortgage servicing intangibles 754 1,063
Level 1 Inputs [Member]
   
Fair value of financial assets and liabilities measured on recurring basis    
Securities available for sale      
Derivative assets      
Derivative liabilities      
Loans held for sale      
Mortgage servicing intangibles      
Level 2 Inputs [Member]
   
Fair value of financial assets and liabilities measured on recurring basis    
Securities available for sale 536,101 580,338
Derivative assets 3,521 7,082
Derivative liabilities 1,801 5,420
Loans held for sale 13,661 12,126
Mortgage servicing intangibles      
Level 3 Inputs [Member]
   
Fair value of financial assets and liabilities measured on recurring basis    
Securities available for sale 10,025 12,162
Derivative assets      
Derivative liabilities      
Loans held for sale      
Mortgage servicing intangibles $ 754 $ 1,063