Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Investment securities [Abstract]
Investment securities, fair value	$ 1,817,929	$ 2,072,586
Real estate and other repossessed assets, allowance	$ 5,537	$ 5,355
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)	76,817,607	76,593,292
Common stock, shares outstanding (in shares)	76,817,607	76,593,292
Treasury Stock, Common, Shares	12,696,308	11,626,115
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest	$ 280,035	$ 277,123