CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 07, 2011
Allowance for credit losses	2,239	2,256
Amounts pledged	391,900	569,995
Class A Stock [Member]
Common stock issued	13,508,318	13,508,318			13,572,265
Common stock, shares outstanding	13,508,318	13,508,318	13,489,162	13,572,265	13,572,265
Class B Stock [Member]
Common stock issued	99,680	99,680
Common stock, shares outstanding	99,680	99,680