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Commitments and Contingencies - Commitments and letters of credit (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Supply Commitment [Line Items]    
Accrued litigation liability $ 0 $ 220
Commitments and letters of credit 768,876 781,350
Commitments to extend credit
   
Supply Commitment [Line Items]    
Commitments and letters of credit 668,306 690,917
Standby letters of credit
   
Supply Commitment [Line Items]    
Commitments and letters of credit 44,190 39,176
Other commercial letters of credit
   
Supply Commitment [Line Items]    
Commitments and letters of credit $ 56,380 $ 51,257