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Borrowings - Summary of Bancorps Short Term Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
FHLB Advances
Short-term Debt [Line Items]
Maximum outstanding at any month end	$ 2,283,250	$ 1,697,800	$ 1,365,300
Average balance during the year	$ 1,415,755	$ 965,293	$ 844,835
Weighted-average interest rate during the year	1.44%	0.95%	0.60%
Federal Funds Purchased
Short-term Debt [Line Items]
Maximum outstanding at any month end	$ 238,000	$ 137,000	$ 85,000
Average balance during the year	$ 163,466	$ 84,514	$ 41,397
Weighted-average interest rate during the year	1.19%	0.58%	0.35%

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

+ 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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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

+ 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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