Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Investment securities [Abstract]
Investment Securities, Fair Value	$ 2,185,384	$ 2,346,768
Real estate and other repossessed assets, allowance	$ (4,406)	$ (10,115)
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	(76,592,098)	(76,423,345)
Common Stock, Shares, Outstanding	(76,592,098)	(76,423,345)
Treasury stock, shares at cost (in shares)	10,222,890	9,464,711