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Loans - Summary of Activities in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Loan Losses
Balance at beginning of year				$ 6,784				$ 6,057	$ 6,784	$ 6,057	$ 5,905
Provision for loan loss	$ 25	$ 99	$ 25	$ 73	$ 197	$ 308	$ 339	$ 277	222	1,121	625
Loans charged off									(288)	(550)	(1,030)
Recoveries									150	156	557
Balance at ending of year	6,868				6,784				6,868	6,784	6,057
Allowance for Unfunded Loan Commitments & Letters of Credit	227				217				227	217	208
Total Allowance for Credit Losses	$ 7,095				$ 7,001				$ 7,095	$ 7,001	$ 6,265

X

- 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.

+ References

No definition available.

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- Definition

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

+ References

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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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