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Additional Information Related to the Impaired Loan Pools (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Recorded investment	$ 10,889		$ 10,889		$ 9,568
Unpaid principal balance	11,348		11,348		10,009
Interest income recognized	128	$ 33	523	$ 334
Average recorded investment	11,023	10,430	12,100	9,458
PCI loans
Financing Receivable, Recorded Investment [Line Items]
Recorded investment	3,015		3,015		14,607
Unpaid principal balance	3,978		3,978		31,169
Allowance for loan losses			20		$ 58
Interest income recognized	96	82	273	2,154
Average recorded investment	$ 3,045	$ 1,416	$ 3,464	$ 35,063

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

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