Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Allowance for credit losses	$ 2,436	$ 2,423
Amounts pledged	664,654	586,625
Net accumulated depreciation	$ 100,510	$ 97,118
Class A Stock [Member]
Common stock, shares issued	13,519,126	13,377,967
Common stock, shares outstanding	13,519,126	13,377,967
Class B Stock [Member]
Common stock, shares issued	99,680	99,680
Common stock, shares outstanding	99,680	99,680