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Additional Information Related to the Impaired Loan Pools (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Recorded investment	$ 12,383		$ 12,383		$ 9,568
Unpaid principal balance	12,839		12,839		10,009
Interest income recognized	100	$ 219	395	$ 462
Average recorded investment	12,387	8,588	12,639	8,976
PCI loans
Financing Receivable, Recorded Investment [Line Items]
Recorded investment	3,125		3,125		14,607
Unpaid principal balance	4,077		4,077		31,169
Allowance for loan losses			114		$ 58
Interest income recognized	87	1,290	177	2,072
Average recorded investment	$ 3,462	$ 55,024	$ 3,677	$ 52,166

X

- Definition

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

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

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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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