Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Investment securities [Abstract]
Investment Securities, Fair Value	$ 2,000,065	$ 2,072,586
Real estate and other repossessed assets, allowance	$ (5,355)	$ (5,355)
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	(76,793,000)	(76,593,292)
Common Stock, Shares, Outstanding	(76,793,000)	(76,593,292)
Treasury stock, shares at cost (in shares)	12,277,965	11,626,115