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Information on Impaired PCI Loan Pools (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) Loan	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Loan	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Loan
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance	$ 7,652		$ 7,652		$ 11,277
Recorded investment	7,436		7,436		11,184
Interest income recognized	169	$ 128	555	$ 523
Average recorded investment	7,665	11,023	7,773	12,100
PCI loans
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance	1,104		1,104		3,759
Recorded investment	$ 1,104		1,104		2,834
Allowance for loan losses			$ 12		$ 54
Number of impaired loans | Loan	1		1		2
Interest income recognized	$ 12	96	$ 130	273
Average recorded investment	$ 1,139	$ 3,045	$ 2,195	$ 3,464

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Loans And Leases Receivable Impaired Number Of Loans

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