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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Investment securities:    
Held-to-Maturity, Estimated Fair Value $ 493,925 $ 513,273
Stockholders' equity:    
Nonvoting noncumulative preferred stock, par value $ 0 $ 0
Nonvoting noncumulative preferred stock, authorized shares 100,000 100,000
Nonvoting noncumulative preferred stock, issued shares 0 0
Nonvoting noncumulative preferred stock, outstanding shares 0 0