Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for credit losses on HTM	$ 1,377	$ 1,279
Available-for-sale, amortized cost	$ 7,070,582	$ 7,130,861
Common stock, Class A, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, Class A, shares authorized (in shares)	175,000,000	175,000,000
Common stock, Class A, shares issued (in shares)	112,505,555	112,715,444
Common stock, Class A, shares outstanding (in shares)	112,505,555	112,715,444