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Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Maximum
Y
Dec. 31, 2011
Commitments to extend credit
Dec. 31, 2011
Credit card lines
Dec. 31, 2011
Standby letters of credit
Dec. 31, 2011
Commercial letters of credit
Dec. 31, 2011
Unsecured letters of credit
Dec. 31, 2010
Unsecured letters of credit
Financial amounts of instruments, whose contract amounts represent credit risks              
Outstanding amount of financial instruments whose, contract amounts represent credit risks   $ 1,042,237,000 $ 60,895,000 $ 112,343,000 $ 20,224,000    
Unsecured letters of credit           $ 27,991,000 $ 29,160,000
Credit risk commitment, maximum expiration date (in years) 1