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Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, Fair value $ 14,688 $ 16,450
Available-for-sale securities, Fair value 1,434,454 1,393,340
Other borrowings, Fair value 11,424 11,847
Obligations of U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, Fair value 11,185 11,860
Available-for-sale securities, Fair value 588,311 593,778
Residential Mortgage-backed securities U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, Fair value 3,503 4,590
Available-for-sale securities, Fair value 620,578 540,355
Obligations of U.S. states and political subdivisions
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 73,951 79,056
Residential Mortgage-backed securities U.S. Government agencies
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 144,293 167,667
Residential Mortgage-backed securities Non-U.S. Government agencies or sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 394 4,354
U.S. corporate debt securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 4,945 5,083
Equity securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 1,982 2,043
U.S. Treasury securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value   1,004
Recurring | Fair Value | Other borrowings
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other borrowings, Fair value 11,424 0
Recurring | Fair Value | Obligations of U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, Fair value 11,185 11,860
Available-for-sale securities, Fair value 588,311 593,778
Recurring | Fair Value | Residential Mortgage-backed securities U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, Fair value 3,503 4,590
Available-for-sale securities, Fair value 620,578 540,355
Recurring | Fair Value | Obligations of U.S. states and political subdivisions
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 73,951 79,056
Recurring | Fair Value | Residential Mortgage-backed securities U.S. Government agencies
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 144,293 167,667
Recurring | Fair Value | Residential Mortgage-backed securities Non-U.S. Government agencies or sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 394 4,354
Recurring | Fair Value | U.S. corporate debt securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 4,945 5,083
Recurring | Fair Value | Equity securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 1,982 2,043
Recurring | Fair Value | U.S. Treasury securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value   1,004
Recurring | Level 1 | Other borrowings
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other borrowings, Fair value 0 11,847
Recurring | Level 1 | Obligations of U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, Fair value 11,185 11,860
Available-for-sale securities, Fair value 0 0
Recurring | Level 1 | Residential Mortgage-backed securities U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, Fair value 3,503 4,590
Available-for-sale securities, Fair value 0 0
Recurring | Level 1 | Obligations of U.S. states and political subdivisions
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 0 0
Recurring | Level 1 | Residential Mortgage-backed securities U.S. Government agencies
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 0 0
Recurring | Level 1 | Residential Mortgage-backed securities Non-U.S. Government agencies or sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 0 0
Recurring | Level 1 | U.S. corporate debt securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 0 0
Recurring | Level 1 | Equity securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 0 0
Recurring | Level 1 | U.S. Treasury securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value   1,004
Recurring | Level 2 | Other borrowings
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other borrowings, Fair value 11,424 11,847
Recurring | Level 2 | Obligations of U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, Fair value 0 0
Available-for-sale securities, Fair value 588,311 593,778
Recurring | Level 2 | Residential Mortgage-backed securities U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, Fair value 0 0
Available-for-sale securities, Fair value 620,578 540,355
Recurring | Level 2 | Obligations of U.S. states and political subdivisions
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 73,951 79,056
Recurring | Level 2 | Residential Mortgage-backed securities U.S. Government agencies
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 144,293 167,667
Recurring | Level 2 | Residential Mortgage-backed securities Non-U.S. Government agencies or sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 394 4,354
Recurring | Level 2 | U.S. corporate debt securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 4,945 5,083
Recurring | Level 2 | Equity securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 0 985
Recurring | Level 2 | U.S. Treasury securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value   0
Recurring | Level 3 | Other borrowings
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other borrowings, Fair value 0 0
Recurring | Level 3 | Obligations of U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, Fair value 0 0
Available-for-sale securities, Fair value 0 0
Recurring | Level 3 | Residential Mortgage-backed securities U.S. Government sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, Fair value 0 0
Available-for-sale securities, Fair value 0 0
Recurring | Level 3 | Obligations of U.S. states and political subdivisions
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 0 0
Recurring | Level 3 | Residential Mortgage-backed securities U.S. Government agencies
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 0 0
Recurring | Level 3 | Residential Mortgage-backed securities Non-U.S. Government agencies or sponsored entities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 0 0
Recurring | Level 3 | U.S. corporate debt securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 0 0
Recurring | Level 3 | Equity securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value 1,982 1,058
Recurring | Level 3 | U.S. Treasury securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, Fair value   $ 0