Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investment securities [Abstract]
Investment Securities, Fair Value	$ 252,707	$ 272,431
Real estate and other repossessed assets, allowance	$ (15,507)	$ (15,060)
Shareholders' equity: [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.00006	$ 0.00006
Common Stock, Shares Authorized	2,500,000,000	2,500,000,000
Common Stock, Shares, Issued	(76,244,164)	(75,995,205)
Common Stock, Shares, Outstanding	(76,244,164)	(75,995,205)
Treasury Stock, Shares	6,686,291	6,357,605

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