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Information on Impaired PCI Loan Pools (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Loan	Dec. 31, 2015 USD ($) Loan	Dec. 31, 2014 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance	$ 24,133	$ 27,005
Recorded investment	22,074	25,402
Interest income recognized	1,356	952	$ 1,054
Average recorded investment	27,494	29,064	25,128
PCI loans
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance	1,086	3,759
Recorded investment	1,085	2,834
Allowance for loan losses	$ 12	$ 54
Number of impaired loans | Loan	1	2
Interest income recognized	$ 142	$ 364	3,081
Average recorded investment	$ 1,929	$ 3,309	$ 30,007

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Loans And Leases Receivable Impaired Number Of Loans

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Amount of other addition (reduction) in allowance reserve for credit loss.

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

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