Investments in Affiliated Companies - Summary Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]
Income - interest income from subordinated debentures issued by HopFed Bancorp, Inc.	$ 8,012	$ 8,994	$ 25,126	$ 26,386
Majority-Owned Subsidiary, Unconsolidated [Member]
Schedule of Equity Method Investments [Line Items]
Income - interest income from subordinated debentures issued by HopFed Bancorp, Inc.	87	88	264	261
Net income	$ 87	$ 88	$ 264	$ 261