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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

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers.

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