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Short-term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Ending Balance	$ 1,510,825	$ 1,105,876	$ 626,615
Average Balance	$ 1,252,531	$ 815,393	$ 478,388
Average Rate	0.40%	0.30%	0.26%
Federal funds purchased
Short-term Debt [Line Items]
Ending Balance	$ 4,000	$ 9,000	$ 16,000
Average Balance	$ 14,832	$ 11,691	$ 11,982
Average Rate	0.36%	0.36%	0.36%
Borrowings from FHLB
Short-term Debt [Line Items]
Ending Balance	$ 1,400,000	$ 945,000	$ 478,100
Average Balance	$ 1,117,522	$ 644,651	$ 335,449
Average Rate	0.42%	0.31%	0.27%
Securities sold under agreements to repurchase
Short-term Debt [Line Items]
Ending Balance	$ 106,825	$ 151,876	$ 132,515
Average Balance	$ 120,177	$ 159,051	$ 130,957
Average Rate	0.23%	0.24%	0.25%
Maximum [Member]
Short-term Debt [Line Items]
Ending Balance	$ 1,510,825	$ 1,105,876	$ 626,615
Weighted Average [Member]
Short-term Debt [Line Items]
Average Rate	0.53%	0.30%	0.27%

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.(a),16(a)(1))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Subparagraph a(1)
-Article 7

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19
-Subparagraph a
-Article 5

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 13
-Subparagraph 2, 3
-Article 9

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher SEC
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