Commitments and Contingencies (Detail) - First Federal's mortgage loan pipeline and obligations under forward commitments along with the fair value of those obligations (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011
Mortgage loan pipeline	$ 96,866	$ 85,460	$ 79,917
Expected pipeline closures	72,650	63,945	59,698
Fair value of mortgage loan pipeline commitments	1,943	1,104	1,335
Forward commitments	144,852	148,902	130,378
Fair value of forward commitments	$ 1,347	$ 358	$ (31)