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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale Securities, Amortized Cost Basis | $ 6,885,797 | $ 7,163,574
Class A Common Stock |  |
Common stock, par value (in dollars per share) | $ 1 | $ 1
Common stock, shared authorized | 16,000,000 | 16,000,000
Common stock, shares issued | 11,005,220 | 11,005,220
Common stock, shares outstanding | 11,005,220 | 11,005,220
Class B Common Stock |  |
Common stock, par value (in dollars per share) | $ 1 | $ 1
Common stock, shared authorized | 2,000,000 | 2,000,000
Common stock, shares issued | 1,005,185 | 1,005,185
Common stock, shares outstanding | 1,005,185 | 1,005,185
Mortgage Backed Securities, Other |  |
Available-for-sale Securities, Amortized Cost Basis | $ 4,692,447 | $ 3,628,187
Held-to-maturity Securities, Fair Value | $ 265 | $ 544

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