Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investment securities [Abstract]
Investment securities, fair value	$ 2,072,586	$ 2,346,768
Real estate and other repossessed assets, allowance	$ 5,355	$ 10,115
Shareholders' equity: [Abstract]
Common stock, par value (in dollars per share)	$ 0.00006	$ 0.00006
Common stock, shares authorized (in shares)	2,500,000,000	2,500,000,000
Common stock, shares issued (in shares)	76,593,292	76,423,345
Common stock, shares outstanding (in shares)	76,593,292	76,423,345
Treasury Stock, Common, Shares	11,626,115	9,464,711