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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Oct. 07, 2011
--- | --- | --- | --- | --- | --- | --- | ---
Allowance for credit losses | $ 2,109 |  | $ 2,256 |  |  |  |
Amounts pledged | $ 550,045 |  | $ 569,995 |  |  |  |
Class A Stock [Member] |  |  |  |  |  |  |
Common stock, issued | 13,496,783 |  | 13,508,318 |  |  |  | 13,572,265
Common stock, shares outstanding | 13,496,783 | 13,508,318 | 13,508,318 | 13,489,162 | 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 |  |  |  |

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