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Regulatory Matters - Summary of Actual Capital Levels and Minimum Levels (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Consolidated [Member]
    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk weighted assets), Actual Amount $ 186,699 $ 173,323
Tier 1 capital (to risk weighted assets), Actual Amount 171,362 158,349
Tier 1 capital (to average assets), Actual Amount 171,362 158,349
Total capital (to risk weighted assets), Actual Ratio 15.30% 14.60%
Tier 1 capital (to risk weighted assets), Actual Ratio 14.10% 13.40%
Tier 1 capital (to average assets), Actual Ratio 12.60% 11.30%
Total capital (to risk weighted assets), Minimum Amount Required for Capital Adequacy Purposes 97,366 94,738
Tier 1 capital (to risk weighted assets), Minimum Amount Required for Capital Adequacy Purposes 48,683 47,369
Tier 1 capital (to average assets), Minimum Amount Required for Capital Adequacy Purposes 54,537 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      
Bank [Member]
    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk weighted assets), Actual Amount 186,020 173,828
Tier 1 capital (to risk weighted assets), Actual Amount 170,691 158,871
Tier 1 capital (to average assets), Actual Amount 170,691 158,871
Total capital (to risk weighted assets), Actual Ratio 15.30% 14.70%
Tier 1 capital (to risk weighted assets), Actual Ratio 14.00% 13.40%
Tier 1 capital (to average assets), Actual Ratio 12.50% 11.40%
Total capital (to risk weighted assets), Minimum Amount Required for Capital Adequacy Purposes 97,317 94,629
Tier 1 capital (to risk weighted assets), Minimum Amount Required for Capital Adequacy Purposes 48,659 47,315
Tier 1 capital (to average assets), Minimum Amount Required for Capital Adequacy Purposes 54,510 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 121,646 118,286
Tier 1 capital (to risk weighted assets), Minimum Amount Required to be Well Capitalized Under Prompt Corrective Action Regulations 73,025 70,972
Tier 1 capital (to average assets), Minimum Amount Required to be Well Capitalized Under Prompt Corrective Action Regulations $ 68,171 $ 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%