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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Allowance for credit losses | $ 790 |  | $ 794 |  |  |
Amounts pledged | 644,359 |  | 438,385 |  |  |
Securities purchased under agreements to resell, fair value | 3,617 |  | 24,006 |  |  |
Accumulated amortization | 23,735 |  | 24,826 |  |  |
Accumulated allowance | 7,445 |  | 6,784 |  |  |
Net accumulated depreciation | 86,502 |  | 84,073 |  |  |
Unamortized debt issuance expense | 1,104 |  | 648 |  |  |
Deferred tax assets, gross | $ 61,296 |  | $ 59,062 |  |  |
Class A Stock [Member] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 50,000,000 |  | 50,000,000 |  |  |
Common stock, shares issued (in shares) | 13,132,775 |  | 13,261,095 |  |  |
Common stock, shares outstanding (in shares) | 13,132,775 | 13,182,332 | 13,261,095 | 13,259,715 | 13,263,532 | 13,238,486
Common stock, par value (dollars per share) | $ 0.001 |  | $ 0.001 |  |  |
Class B Stock [Member] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 99,665 |  | 99,665 |  |  |
Common stock, shares issued (in shares) | 99,665 |  | 99,665 |  |  |
Common stock, shares outstanding (in shares) | 99,665 |  | 99,665 |  |  |
Common stock, par value (dollars per share) | $ 0.001 |  | $ 0.001 |  |  |

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