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Borrowings - Short Term Borrowings (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
FHLB advances	$ 850,000	$ 850,000
Federal funds purchased	365,000	250,000
Total short-term debt	$ 1,215,000	$ 1,100,000
FHLB advances, rate	1.21%	1.19%
Federal funds purchased, rate	0.05%	0.09%

X

- Definition

Discloses the single interest rate [if] applicable to Federal Funds Purchased as of the Balance Sheet date.

+ References

No definition available.

+ Details

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X

- Definition

Discloses the single interest rate [if] applicable to short-term advances from the Federal Home Loan Bank as of the Balance Sheet date.

+ References

No definition available.

+ Details

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- Definition

Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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- Definition

Amount of advance from Federal Home Loan Bank (FHLBank) maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
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-Section 50
-Paragraph 1
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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