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Short-term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Ending Balance	$ 707,466	$ 867,943	$ 1,510,825
Average Balance	$ 867,391	$ 1,387,737	$ 1,252,531
Average Rate	1.01%	0.58%	0.40%
Federal funds purchased
Short-term Debt [Line Items]
Ending Balance	$ 0	$ 0	$ 4,000
Average Balance	$ 6,225	$ 6,887	$ 14,832
Average Rate	1.24%	0.60%	0.36%
Borrowings from FHLB
Short-term Debt [Line Items]
Ending Balance	$ 567,500	$ 748,000	$ 1,400,000
Average Balance	$ 710,932	$ 1,265,932	$ 1,117,522
Average Rate	1.18%	0.61%	0.42%
Securities sold under agreements to repurchase
Short-term Debt [Line Items]
Ending Balance	$ 139,966	$ 119,943	$ 106,825
Average Balance	$ 150,234	$ 114,918	$ 120,177
Average Rate	0.24%	0.23%	0.23%
Maximum [Member]
Short-term Debt [Line Items]
Ending Balance	$ 967,259	$ 1,530,678	$ 1,510,825
Weighted Average [Member]
Short-term Debt [Line Items]
Average Rate	1.27%	0.63%	0.53%

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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 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 2: 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 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

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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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