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Loans - Summary of Activities in Allowance for Credit Losses (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	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2013
Allowance for Loan & Lease Losses
Balance at beginning of year			$ 5,905	$ 5,194	$ 5,194
Provision for loan loss	$ 243	$ 282	540	1,154	1,191
Loans charged off	(177)	(95)	(798)	(630)	(778)
Recoveries	172	66	518	198	298
Balance at ending of year	6,165		6,165		5,905
Allowance for Unfunded Loan Commitments & Letters of Credit	196		196		207
Total Allowance for Credit Losses	$ 6,361	$ 6,112	$ 6,361	$ 6,112	$ 6,112	$ 6,128	$ 5,849	$ 5,357

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- Definition

Allowance is intended to reflect the potential for losses that may not be funded but for which the bank has made a commitment to fund including letters of credit.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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