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Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of Activity Related to Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	$ 5,813	$ 2,813	$ 2,159	$ 3,112
New modifications	2,453	0	7,096	0
Payoffs/payments, net and other	(51)	(42)	(1,040)	(341)
TDRs returned to accrual status	0	0	0	0
TDRs placed on nonaccrual status	0	0	0	0
Ending balance	8,215	2,771	8,215	2,771
Nonperforming TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	0	0	0	244
New modifications	0	0	0	0
Charge-offs	0	0	0	0
Transfer to OREO	0	0	0	244
Payoffs/payments, net and other	0	0	0	0
TDRs returned to accrual status	0	0	0	0
TDRs placed on nonaccrual status	0	0	0	0
Ending balance	$ 8,215	$ 2,771	$ 8,215	$ 2,771

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Financing Receivables Impaired Troubled Debt Restructuring Additions

+ References

No definition available.

+ Details

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- Definition

Financing Receivables Impaired Troubled Debt Restructuring Payments

+ References

No definition available.

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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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- 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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X

- 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
-SubTopic 10
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