Federal Income Taxes - Summary of Reconciliation of Rate of Taxes Payable at Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Federal income taxes computed at the expected statutory rate	$ 305	$ 146	$ 570	$ 442
Increase (decrease) in taxes resulting from:
Nontaxable dividend and interest income	0	(1)	0	(15)
Increase in cash surrender value of life insurance - net	(53)	(128)	(160)	(237)
Valuation allowance for deferred tax assets	0	10	(5,868)	(21)
Other	(81)	(80)	(245)	(247)
Federal income tax provision per consolidated financial statements	$ 171	$ (53)	$ (5,703)	$ (78)