Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities, fair value $ 10,991 $ 16,450
Available-for-sale securities, at fair value 1,354,811 1,393,340
Other borrowings, fair value 11,292 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 8,275 11,860
Available-for-sale securities, at fair value 556,345 593,778
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 2,716 4,590
Available-for-sale securities, at fair value 577,472 540,355
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, at fair value 67,962 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, at fair value 146,678 167,667
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, at fair value 311 4,354
U.S. corporate debt securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 4,633 5,083
Equity securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 1,410 2,043
U.S. Treasury securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at 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 11,292 11,847
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 8,275 11,860
Available-for-sale securities, at fair value 556,345 593,778
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 2,716 4,590
Available-for-sale securities, at fair value 577,472 540,355
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, at fair value 67,962 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, at fair value 146,678 167,667
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, at fair value 311 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, at fair value 4,633 5,083
Recurring | Fair Value | Equity securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 1,410 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, at 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 0
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 0 0
Available-for-sale securities, at 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 0 0
Available-for-sale securities, at 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, at 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, at 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, at 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, at 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, at 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, at fair value   0
Recurring | Level 2 | Other borrowings
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other borrowings, fair value 11,292 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 8,275 11,860
Available-for-sale securities, at fair value 556,345 593,778
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 2,716 4,590
Available-for-sale securities, at fair value 577,472 540,355
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, at fair value 67,962 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, at fair value 146,678 167,667
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, at fair value 311 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, at fair value 4,633 5,083
Recurring | Level 2 | Equity securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value 1,410 985
Recurring | Level 2 | U.S. Treasury securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities, at fair value   1,004
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, at 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, at 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, at 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, at 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, at 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, at 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, at fair value 0 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, at fair value   $ 0