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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities: |  |
Estimated fair value | $ 455,500 | $ 483,300
Stockholders' equity: |  |
Nonvoting, noncumulative preferred stock, shares authorized | 100,000 | 100,000
Nonvoting, noncumulative preferred stock, shares issued | 0 | 0
Nonvoting, noncumulative preferred stock, shares outstanding | 0 | 0

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