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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	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 20,859	$ 55,309
Performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	42,687	53,589
New modifications	1,996	3,689
Payoffs and payments, net	(34,001)	(15,235)
TDRs returned to accrual status	8,551	644
TDRs placed on nonaccrual status	0	0
Ending balance	19,233	42,687
Nonperforming TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	12,622	20,285
New modifications	102	661
Charge-offs	(38)
Transfer to OREO		(842)
Payoffs and payments, net	(2,509)	(6,838)
TDRs returned to accrual status	(8,551)	(644)
TDRs placed on nonaccrual status	0	0
Ending balance	$ 1,626	$ 12,622

X

- Definition

Financing Receivable Modifications Recorded Investments

+ References

No definition available.

+ Details

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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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- 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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- Definition

Financing Receivables Impaired Troubled Debt Restructuring Transfer To Other Real Estate Owned

+ References

No definition available.

+ Details

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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

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=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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- 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=25495931&loc=d3e18845-111554

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