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Loans - Weighted Average Risk Grades for All Commercial Loans by Class (Detail) (USD $) In Thousands, unless otherwise specified				3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Mar. 31, 2014 Commercial and industrial, Energy [Member] Grade	Dec. 31, 2013 Commercial and industrial, Energy [Member] Grade	Mar. 31, 2014 Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2013 Commercial and industrial, Other commercial [Member] Grade	Mar. 31, 2014 Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2013 Commercial real estate, Buildings, land and other [Member] Grade	Mar. 31, 2014 Commercial real estate, Construction [Member] Grade	Dec. 31, 2013 Commercial real estate, Construction [Member] Grade	Mar. 31, 2014 Risk grades 1-8 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2013 Risk grades 1-8 [Member] Commercial and industrial, Energy [Member] Grade	Mar. 31, 2014 Risk grades 1-8 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2013 Risk grades 1-8 [Member] Commercial and industrial, Other commercial [Member] Grade	Mar. 31, 2014 Risk grades 1-8 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2013 Risk grades 1-8 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Mar. 31, 2014 Risk grades 1-8 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2013 Risk grades 1-8 [Member] Commercial real estate, Construction [Member] Grade	Mar. 31, 2014 Risk grade 9 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2013 Risk grade 9 [Member] Commercial and industrial, Energy [Member] Grade	Mar. 31, 2014 Risk grade 9 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2013 Risk grade 9 [Member] Commercial and industrial, Other commercial [Member] Grade	Mar. 31, 2014 Risk grade 9 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2013 Risk grade 9 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Mar. 31, 2014 Risk grade 9 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2013 Risk grade 9 [Member] Commercial real estate, Construction [Member] Grade	Mar. 31, 2014 Risk grade 10 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2013 Risk grade 10 [Member] Commercial and industrial, Energy [Member] Grade	Mar. 31, 2014 Risk grade 10 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2013 Risk grade 10 [Member] Commercial and industrial, Other commercial [Member] Grade	Mar. 31, 2014 Risk grade 10 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2013 Risk grade 10 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Mar. 31, 2014 Risk grade 10 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2013 Risk grade 10 [Member] Commercial real estate, Construction [Member] Grade	Mar. 31, 2014 Risk grade 11 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2013 Risk grade 11 [Member] Commercial and industrial, Energy [Member] Grade	Mar. 31, 2014 Risk grade 11 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2013 Risk grade 11 [Member] Commercial and industrial, Other commercial [Member] Grade	Mar. 31, 2014 Risk grade 11 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2013 Risk grade 11 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Mar. 31, 2014 Risk grade 11 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2013 Risk grade 11 [Member] Commercial real estate, Construction [Member] Grade	Mar. 31, 2014 Risk grade 12 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2013 Risk grade 12 [Member] Commercial and industrial, Energy [Member] Grade	Mar. 31, 2014 Risk grade 12 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2013 Risk grade 12 [Member] Commercial and industrial, Other commercial [Member] Grade	Mar. 31, 2014 Risk grade 12 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2013 Risk grade 12 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Mar. 31, 2014 Risk grade 12 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2013 Risk grade 12 [Member] Commercial real estate, Construction [Member] Grade	Mar. 31, 2014 Risk grade 13 [Member] Commercial and industrial, Energy [Member] Grade	Dec. 31, 2013 Risk grade 13 [Member] Commercial and industrial, Energy [Member] Grade	Mar. 31, 2014 Risk grade 13 [Member] Commercial and industrial, Other commercial [Member] Grade	Dec. 31, 2013 Risk grade 13 [Member] Commercial and industrial, Other commercial [Member] Grade	Mar. 31, 2014 Risk grade 13 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Dec. 31, 2013 Risk grade 13 [Member] Commercial real estate, Buildings, land and other [Member] Grade	Mar. 31, 2014 Risk grade 13 [Member] Commercial real estate, Construction [Member] Grade	Dec. 31, 2013 Risk grade 13 [Member] Commercial real estate, Construction [Member] Grade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Risk Grade				5.43	5.40	6.28	6.27	6.83	6.83	7.07	7.10	5.36	5.37	5.98	5.95	6.59	6.59	7.05	7.05	9.00	9.00	9.00	9.00	9.00	9.00	9.00	9.00	10.00	10.00	10.00	10.00	10.00	10.00	10.00	10.00	11.00	11.00	11.00	11.00	11.00	11.00	11.00	11.00	12.00	12.00	12.00	12.00	12.00	12.00	12.00	12.00	13.00	13.00	13.00	13.00	13.00	13.00	13.00	13.00
Loans	$ 5,106,726	$ 4,907,076	$ 4,708,665	$ 1,152,319	$ 1,115,409	$ 3,954,407	$ 3,791,667					$ 1,129,839	$ 1,106,348	$ 3,671,876	$ 3,507,963					$ 21,733	$ 7,726	$ 76,294	$ 74,766					$ 221	$ 245	$ 87,148	$ 89,878					$ 0	$ 500	$ 96,581	$ 92,917					$ 526	$ 590	$ 19,253	$ 21,389					$ 0	$ 0	$ 3,255	$ 4,754
Loans	3,496,139	3,467,336	3,391,509					3,050,648	3,040,697							2,840,771	2,844,665							88,408	65,770							47,465	49,881							50,454	53,208							22,774	24,387							776	2,786
Loans	$ 445,491	$ 426,639								$ 445,491	$ 426,639							$ 441,923	$ 418,999							$ 1,682	$ 1,301							$ 1,353	$ 5,931							$ 221	$ 408							$ 312	$ 0							$ 0	$ 0

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Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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Amount before allowance of commercial construction loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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