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Fair Value (Fair value measurement recurring) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities $ 0 $ 1,801
Securities available for sale 1,400,756 1,633,902
Forward Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 238 1,206
U.S. Government Corporations and Agencies
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 146,696 218,303
Mortgage-Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 1,049,621 1,143,947
Obligations of States and Political Subdivisions
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 199,398 266,624
Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 5,041 5,028
Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 0 1,801
Securities available for sale 2,555 4,084
Derivative assets 0 0
Derivative liabilities 0 0
Level 1 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Level 1 | Forward Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 0 0
Securities available for sale 1,393,871 1,626,520
Derivative assets 152 0
Derivative liabilities 3,467 3,697
Level 2 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Level 2 | Forward Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 238 1,206
Derivative liabilities 307 133
Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 0 0
Securities available for sale 4,330 3,298
Derivative assets 0 0
Derivative liabilities 0 0
Level 3 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 2,993 1,809
Level 3 | Forward Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring Basis | Total Fair Value
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 0 1,801
Total assets at fair value 1,404,139 1,638,718
Total liabilities at fair value 3,774 3,830
Recurring Basis | Total Fair Value | Interest Rate Swap
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 152  
Derivative liabilities 3,467 3,697
Recurring Basis | Total Fair Value | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 2,993 1,809
Recurring Basis | Total Fair Value | Forward Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 238 1,206
Derivative liabilities 307 133
Recurring Basis | Total Fair Value | U.S. Government Corporations and Agencies
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 146,696 218,303
Recurring Basis | Total Fair Value | Mortgage-Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 1,049,621 1,143,947
Recurring Basis | Total Fair Value | Obligations of States and Political Subdivisions
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 199,398 266,624
Recurring Basis | Total Fair Value | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 5,041 5,028
Recurring Basis | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 0 1,801
Total assets at fair value 2,555 5,885
Total liabilities at fair value 0 0
Recurring Basis | Level 1 | Interest Rate Swap
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0  
Derivative liabilities 0 0
Recurring Basis | Level 1 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Recurring Basis | Level 1 | Forward Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring Basis | Level 1 | U.S. Government Corporations and Agencies
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,555 4,084
Recurring Basis | Level 1 | Mortgage-Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring Basis | Level 1 | Obligations of States and Political Subdivisions
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring Basis | Level 1 | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring Basis | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 0 0
Total assets at fair value 1,394,261 1,627,726
Total liabilities at fair value 3,774 3,830
Recurring Basis | Level 2 | Interest Rate Swap
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 152  
Derivative liabilities 3,467 3,697
Recurring Basis | Level 2 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Recurring Basis | Level 2 | Forward Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 238 1,206
Derivative liabilities 307 133
Recurring Basis | Level 2 | U.S. Government Corporations and Agencies
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 144,141 214,219
Recurring Basis | Level 2 | Mortgage-Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 1,045,291 1,140,649
Recurring Basis | Level 2 | Obligations of States and Political Subdivisions
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 199,398 266,624
Recurring Basis | Level 2 | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 5,041 5,028
Recurring Basis | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 0 0
Total assets at fair value 7,323 5,107
Total liabilities at fair value 0 0
Recurring Basis | Level 3 | Interest Rate Swap
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0  
Derivative liabilities 0 0
Recurring Basis | Level 3 | Interest Rate Lock Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 2,993 1,809
Recurring Basis | Level 3 | Forward Commitments
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring Basis | Level 3 | U.S. Government Corporations and Agencies
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring Basis | Level 3 | Mortgage-Backed Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 4,330 3,298
Recurring Basis | Level 3 | Obligations of States and Political Subdivisions
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Recurring Basis | Level 3 | Equity Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 0 $ 0