Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of Activity Related to Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	$ 3,112	$ 3,594
New modifications	0	0
Payoffs/payments, net and other	(953)	(482)
TDRs returned to accrual status	0	0
TDRs placed on nonaccrual status	0	0
Ending balance	2,159	3,112
Nonperforming TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	244	3,509
New modifications	0	0
Charge-offs	0	(78)
Transfer to OREO	0	(2,275)
Payoffs/payments, net and other	(244)	(912)
TDRs returned to accrual status	0	0
TDRs placed on nonaccrual status	0	0
Ending balance	0	244
Total TDRs	$ 2,159	$ 3,356

Financing Receivable Modifications Recorded Investments

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- Definition

The increase (decrease) in performing troubled debt restructurings financing receivables, because of returns to accrual status.

+ References

No definition available.

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- Definition

The decrease in performing troubled debt restructurings financing receivables, because of the change in accrual status to nonaccrual.

+ References

No definition available.

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- Definition

Financing Receivables Impaired Troubled Debt Restructuring Additions

+ References

No definition available.

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- Definition

Financing Receivables Impaired Troubled Debt Restructuring Payments

+ References

No definition available.

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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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- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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- Definition

Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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