Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Investment securities, held to maturity fair value	$ 768,099	$ 179,990
Loans, net of allowance for credit losses	$ 56,779	$ 57,027
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, shares authorized (in shares)	99,000,000	99,000,000
Common stock, shares issued (in shares)	43,609,536	43,905,631
Common stock, shares outstanding (in shares)	43,520,694	43,880,562