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International Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans:
Loans	$ 6,348,172,000	$ 5,964,688,000
Less allowance for probable loan losses	(67,687,000)	(64,661,000)	$ (66,988,000)	$ (64,828,000)
Net loans	6,280,485,000	5,900,027,000
Accrued interest receivable	34,456,000	32,172,000
International Banking Services
Loans:
Accrued interest receivable	671,000	603,000
Outstanding standby and commercial letters of credit	99,547,000
Revenues	5,248,000	5,495,000	$ 6,113,000
International Banking Services | Foreign
Loans:
Loans	158,886,000	167,220,000
Less allowance for probable loan losses	(842,000)	(884,000)
Net loans	158,044,000	166,336,000
International Banking Services | Foreign | Commercial
Loans:
Loans	113,019,000	124,079,000
International Banking Services | Foreign | Others
Loans:
Loans	$ 45,867,000	$ 43,141,000

X

- Definition

Interest and fee income generated by commercial and consumer loans, made by foreign branches of the reporting entity, which may include loans to foreign governments, foreign banks and other financial institutions, commercial and industrial entities, and citizens of not domiciled in the same country as the reporting entity.

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-SubTopic 225
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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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