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Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Investment securities [Abstract]
Investment Securities, fair value	$ 382,893	$ 480,035	$ 489,895
Allowance for real estate and other repossessed assets	$ 19,794	$ 12,648	$ 11,738
Shareholders' equity: [Abstract]
Common stock, par value (in dollars per share)	$ 0.00006	$ 0.00006	$ 0.00006
Common stock, shares authorized (in shares)	2,500,000,000	2,500,000,000	2,500,000,000
Common stock, shares issued (in shares)	75,308,727	75,147,686	75,129,535
Common stock, shares outstanding (in shares)	75,308,727	75,147,686	75,129,535
Treasury stock, shares at cost (in shares)	9,874,469	9,752,749	9,672,749

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