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Borrowings - Summary of Bancorps Short Term Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
FHLB Advances
Short-term Debt [Line Items]
Maximum outstanding at any month end	$ 910,000	$ 1,190,150	$ 2,622,165
Average balance during the year	$ 809,788	$ 793,304	$ 1,526,180
Weighted-average interest rate during the year	2.31%	2.66%	2.05%
Federal Funds Purchased
Short-term Debt [Line Items]
Maximum outstanding at any month end	$ 842,000	$ 600,000	$ 195,000
Average balance during the year	$ 239,481	$ 271,400	$ 156,652
Weighted-average interest rate during the year	0.19%	2.28%	1.92%

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&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, maximum month-end borrowings during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

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