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Derivatives - Fair Value of Derivative Contracts (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Assets	$ 25,507,000	$ 41,488,000
Liabilities	11,953,000	17,948,000
Notional amounts	1,476,389,000	1,830,454,000
Rate lock commitments
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Assets	9,048,000	21,034,000
Liabilities	5,471,000	2,977,000
Notional amounts	242,615,000	296,972,000
Nasdaq Forwards
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Assets	7,220,000	12,822,000
Liabilities	0	0
Notional amounts	174,000,000	174,000,000
Forward sale contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Assets	9,239,000	7,632,000
Liabilities	6,482,000	14,971,000
Notional amounts	$ 1,059,774,000	$ 1,359,482,000

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: 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

Reference 2: 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 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959

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X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959

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- Definition

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+ References

No definition available.

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