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Condensed Statements of Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Schedule of Condensed Consolidating Statement of Operations [Line Items]                    
Dividend income                 $ 94 $ 81
Other operating expenses                 (2,503) (2,428)
Income tax benefit (551) (218) (427) (363) (415) (451) (358) (319) (1,559) (1,543)
Net income 1,249 719 1,035 919 1,042 1,093 941 896 3,922 3,972
Parent Company
                    
Schedule of Condensed Consolidating Statement of Operations [Line Items]                    
Interest income                 0 1
Dividend income                 2,206 2,207
Other operating expenses                 (228) (222)
Income before income taxes and equity in undistributed net income of subsidiaries                 1,978 1,986
Income tax benefit                 87 71
Income before equity in undistributed net income of subsidiaries                 2,065 2,057
Equity in undistributed net income of subsidiaries                 1,857 1,915
Net income                 $ 3,922 $ 3,972