Regulatory Matters - Summary of Actual Capital Levels and Minimum Levels (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Consolidated [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets), Actual Amount	$ 193,925	$ 173,323
Tier 1 capital (to risk weighted assets), Actual Amount	178,598	158,349
Tier 1 capital (to average assets), Actual Amount	178,598	158,349
Total capital (to risk weighted assets), Actual Ratio	15.90%	14.60%
Tier 1 capital (to risk weighted assets), Actual Ratio	14.70%	13.40%
Tier 1 capital (to average assets), Actual Ratio	12.50%	11.30%
Total capital (to risk weighted assets), Minimum Amount Required for Capital Adequacy Purposes	97,498	94,738
Tier 1 capital (to risk weighted assets), Minimum Amount Required for Capital Adequacy Purposes	48,749	47,369
Tier 1 capital (to average assets), Minimum Amount Required for Capital Adequacy Purposes	57,006	55,995
Total capital (to risk weighted assets), Minimum Ratio Required for Capital Adequacy Purposes	8.00%	8.00%
Tier 1 capital (to risk weighted assets), Minimum Ratio Required for Capital Adequacy Purposes	4.00%	4.00%
Tier 1 capital (to average assets), Minimum Ratio Required for Capital Adequacy Purposes	4.00%	4.00%
Total capital (to risk weighted assets), Minimum Amount Required to be Well Capitalized Under Prompt Corrective Action Regulations
Tier 1 capital (to risk weighted assets), Minimum Amount Required to be Well Capitalized Under Prompt Corrective Action Regulations
Tier 1 capital (to average assets), Minimum Amount Required to be Well Capitalized Under Prompt Corrective Action Regulations
Total capital (to risk weighted assets), Minimum Ratio Required to be Well Capitalized Under Prompt Corrective Action Regulations
Tier 1 capital (to risk weighted assets), Minimum Ratio Required to be Well Capitalized Under Prompt Corrective Action Regulations
Tier 1 capital (to average assets), Minimum Ratio Required to be Well Capitalized Under Prompt Corrective Action Regulations
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets), Actual Amount	190,493	173,828
Tier 1 capital (to risk weighted assets), Actual Amount	175,192	158,871
Tier 1 capital (to average assets), Actual Amount	175,192	158,871
Total capital (to risk weighted assets), Actual Ratio	15.70%	14.70%
Tier 1 capital (to risk weighted assets), Actual Ratio	14.40%	13.40%
Tier 1 capital (to average assets), Actual Ratio	12.30%	11.40%
Total capital (to risk weighted assets), Minimum Amount Required for Capital Adequacy Purposes	97,329	94,629
Tier 1 capital (to risk weighted assets), Minimum Amount Required for Capital Adequacy Purposes	48,665	47,315
Tier 1 capital (to average assets), Minimum Amount Required for Capital Adequacy Purposes	56,860	55,937
Total capital (to risk weighted assets), Minimum Ratio Required for Capital Adequacy Purposes	8.00%	8.00%
Tier 1 capital (to risk weighted assets), Minimum Ratio Required for Capital Adequacy Purposes	4.00%	4.00%
Tier 1 capital (to average assets), Minimum Ratio Required for Capital Adequacy Purposes	4.00%	4.00%
Total capital (to risk weighted assets), Minimum Amount Required to be Well Capitalized Under Prompt Corrective Action Regulations	121,662	118,286
Tier 1 capital (to risk weighted assets), Minimum Amount Required to be Well Capitalized Under Prompt Corrective Action Regulations	72,997	70,972
Tier 1 capital (to average assets), Minimum Amount Required to be Well Capitalized Under Prompt Corrective Action Regulations	$ 71,075	$ 69,922
Total capital (to risk weighted assets), Minimum Ratio Required to be Well Capitalized Under Prompt Corrective Action Regulations	10.00%	10.00%
Tier 1 capital (to risk weighted assets), Minimum Ratio Required to be Well Capitalized Under Prompt Corrective Action Regulations	6.00%	6.00%
Tier 1 capital (to average assets), Minimum Ratio Required to be Well Capitalized Under Prompt Corrective Action Regulations	5.00%	5.00%