Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Statement of Financial Position [Abstract]
Securities, Available-for-sale, Amortized Cost	$ 5,405,189	$ 4,177,179	$ 3,927,254
Loans held-for-sale, fair value	$ 56,257	$ 79,585	$ 63,293
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000	200,000,000
Common stock, shares issued	142,359,774	142,161,834	142,035,396
Treasury stock, shares	938,629	938,591	932,018