Consolidated Balance Sheets - (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Investment securities available for sale, amortized cost	$ 1,674,264	$ 1,129,057
Investment securities available for sale, allowance for credit losses	(132)	(167)
Time deposits	$ 100	$ 100
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	100,000,000	100,000,000
Common stock, issued (in shares)	31,961,573	31,779,663
Common stock, outstanding (in shares)	31,961,573	31,779,663