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Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Activity Related to Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 8,194	$ 21,109
Performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	4,809	19,233
New modifications	0	3,143
Payoffs/payments, net and other	(524)	(3,003)
TDRs returned to accrual status	0	329
TDRs placed on nonaccrual status	0	0
Ending balance	4,285	19,702
Nonperforming TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	4,200	1,626
New modifications	0	2,066
Charge-offs	0	0
Payoffs/payments, net and other	(291)	(1,956)
TDRs returned to accrual status	0	(329)
TDRs placed on nonaccrual status	0	0
Ending balance	$ 3,909	$ 1,407

X

- Definition

Financing Receivable Modifications Recorded Investments

+ References

No definition available.

+ Details

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Period Type:	duration

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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X

- 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

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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