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Commitments and Contingent Liabilities (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Loss Contingencies [Line Items]  
Inherent risks associated with off balance sheet commitments $ 1,898,000
Commitments to Extend Credit [Member]
 
Loss Contingencies [Line Items]  
Amount of commitment 1,030,000,000
Commitments to Extend Credit [Member] | Home equity [Member]
 
Loss Contingencies [Line Items]  
Amount of commitment 166,000,000
Standby Letters of Credit [Member]
 
Loss Contingencies [Line Items]  
Amount of commitment $ 74,700,000
Maximum [Member]
 
Loss Contingencies [Line Items]  
Expiry period of standby letter of credit, maximum 2 years