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Derivatives - Additional Information (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Interest rate swap asset	$ 7,248,000	$ 1,716,000	[1]
Interest rate swap liability	1,593,000	2,735,000	[1]
Cash collateral with counterparties	6,000,000	6,000,000
Derivative assets held for sale	87,700,000	97,100,000
Mortgage derivative asset	5,949,000	5,293,000	[1]
Mortgage derivative liabilities including in other liabilities	0	1,600,000
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Notional Amount	129,800,000	154,300,000
Hedged Instrument [Member]
Derivative [Line Items]
Derivative assets held for sale	$ 182,500,000	$ 225,000,000
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%
[1] Derived from audited December 31, 2020 Consolidated Financial Statements.

X

- Definition

Interest rate swap asset.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Interest rate swap liability.

+ References

No definition available.

+ Details

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X

- Definition

Mortgage derivative asset.

+ References

No definition available.

+ Details

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X

- Definition

Mortgage derivative liability.

+ References

No definition available.

+ Details

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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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