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Derivative Financial Instruments Part 2 (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Designated as Hedging Instrument [Member]
Mortgage Banking, Net [Member]
Mar. 31, 2012
Designated as Hedging Instrument [Member]
Mortgage Banking, Net [Member]
Mar. 31, 2013
Designated as Hedging Instrument [Member]
Forward Contracts [Member]
Other Liabilities [Member]
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Forward Contracts [Member]
Other Liabilities [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Mortgage Banking, Net [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Mortgage Banking, Net [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Bankcard and Other Fees [Member]
Mar. 31, 2012
Not Designated as Hedging Instrument [Member]
Bankcard and Other Fees [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Future Contracts [Member]
Other Assets [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Future Contracts [Member]
Other Assets [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Exchange Traded Purchased Options [Member]
Other Assets [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Exchange Traded Purchased Options [Member]
Other Assets [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
OTC Written Options (Rate Locks) [Member]
Other Assets [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
OTC Written Options (Rate Locks) [Member]
Other Assets [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Other Assets [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Other Assets [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Other Liabilities [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Other Liabilities [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Credit Risk Participation Agreement [Member]
Other Assets [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Credit Risk Participation Agreement [Member]
Other Assets [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Exchange Traded Written Options [Member]
Other Liabilities [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Exchange Traded Written Options [Member]
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]                                                
Fair value of derivative asset $ 4,808 $ 5,241                 $ 323 $ (482) $ 136 $ 42 $ 1,937 $ 2,284 $ 4,808 $ 5,241     $ 19 $ 22    
Fair value of derivative liability 4,920 5,329     804 738                         4,920 5,329     518 545
Derivative Instruments, Gain (Loss) [Line Items]                                                
Amount of gain (loss) recognized     (66) 2,393     (215) (1,467) (27) 35                            
Offsetting of Derivative Assets [Abstract]                                                
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 4,808 5,241                                            
Gross Amounts Offset in the Statement of Financial Position, Offsetting of Derivative Assets 0 0                                            
Net Amounts of Assets presented in the Statement of Financial Position, Offsetting of Derivative Assets 4,808 5,241                 323 (482) 136 42 1,937 2,284 4,808 5,241     19 22    
Financial Instruments, Offsetting of Derivative Assets 0 0                                            
Cash Collateral Received, Offsetting of Derivative Assets 0 0                                            
Net Amount, Offsetting of Derivative Assets 4,808 5,241                                            
Offsetting of Derivative Liabilities [Abstract]                                                
Gross Amounts of Recognized Liabilities, Offsetting of Derivative Liabilities 4,920 5,329                                            
Gross Amounts Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities 0 0                                            
Net Amounts of Liabilities presented in the Statement of Financial Position, Offsetting of Derivative Liabilities 4,920 5,329     804 738                         4,920 5,329     518 545
Financial Instruments, Offsetting of Derivative Liabilities 0 0                                            
Cash Collateral Posted, Offsetting of Derivative Liabilities 1,349 1,370                                            
Net Amount, Offsetting of Derivative Liabilities $ 3,571 $ 3,959