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Financial Instruments with Off-Statement of Condition Risk and Concentrations of Credit Risk (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Maximum
Dec. 31, 2013
Commitments to extend credit
Dec. 31, 2013
Credit card lines
Dec. 31, 2013
Standby letters of credit
Dec. 31, 2013
Commercial letters of credit
Dec. 31, 2013
Unsecured letters of credit
Dec. 31, 2012
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   $ 1,715,365,000 $ 61,120,000 $ 108,683,000 $ 21,434,000    
Guarantee obligations, maximum exposure           108,683,000  
Unsecured letters of credit           $ 42,503,000 $ 28,383,000
Credit risk commitment, maximum expiration date 1 year