Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investment securities [Abstract]
Investment Securities, fair value	$ 296,402	$ 314,402
Investment securities, Allowance for Credit Loss	1,502	0
Allowance for real estate and other repossessed assets	$ 11,029	$ 11,013
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)	76,000,985	75,758,597
Common stock, shares outstanding (in shares)	76,000,985	75,758,597
Treasury stock, shares at cost (in shares)	5,692,453	5,178,999