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International activities - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
International Activities [Line Items]
Revenues from trust-related services	$ 24,000,000	$ 15,000,000
Net assets identified with international activities	179,433,000	159,579,000
Loans to foreign borrowers	148,602,000	128,187,000
Deposits at Cayman Islands office	$ 1,044,519,000	$ 355,927,000

Amount after allowance and deduction of deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts, of loans and leases to borrowers not within the country of domicile of the reporting entity. Excludes loans and leases covered under loss sharing agreements.

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