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Derivative Financial Instruments and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Cash collateral with counterparties	$ 6,000	$ 880
Derivative assets held for sale	154,300
Mortgage derivative asset	5,293	591
Mortgage derivative liability	1,600	$ 2
Hedged Instrument [Member]
Derivative [Line Items]
Derivative assets held for sale	225,000
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Notional Amount	$ 97,100
Identified Hedge [Member]
Derivative [Line Items]
Derivative, fixed interest rate	1.80%
New Hedges [Member] | Minimum [Member]
Derivative [Line Items]
Derivative, fixed interest rate	0.92%
New Hedges [Member] | Maximum [Member]
Derivative [Line Items]
Derivative, fixed interest rate	0.95%
Additional Hedges [Member] | Minimum [Member]
Derivative [Line Items]
Derivative, fixed interest rate	0.83%
Additional Hedges [Member] | Maximum [Member]
Derivative [Line Items]
Derivative, fixed interest rate	0.86%

X

- Definition

Mortgage derivative asset.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Mortgage derivative liability.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624258-113959

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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X

- Definition

Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a 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
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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- Details

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- Details

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