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	Mar. 31, 2013	Dec. 31, 2012
Mortgage loan pipeline	$ 83,634	$ 96,866
Expected pipeline closures	62,726	72,650
Fair value of mortgage loan pipeline commitments	1,304	1,943
Forward commitments	119,577	144,852
Fair value of forward commitments	$ 489	$ 1,347