Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Amortized cost	$ 4,584,851	$ 2,109,008
Debt Securities, Available-for-sale, Allowance for Credit Loss	1,310	0
Held to Maturity Fair value	173,806	110,374
Debt Securities, Held-to-maturity, Allowance for Credit Loss	8,845	0
Allowance for credit losses on loans and finance leases	$ 385,887	$ 155,139
Preferred stock, shares authorized	50,000,000	50,000,000
Non-cumulative Perpetual Monthly Income Preferred Stock, shares issued	22,004,000	22,004,000
Non-cumulative Perpetual Monthly Income Preferred Stock, shares outstanding	1,444,146	1,444,146
Non-cumulative Perpetual Monthly Income Preferred Stock, aggregate liquidation value	$ 36,104	$ 36,104
Common stock, par value	$ 0.1	$ 0.1
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common Stock, Shares, Issued	223,034,348	222,103,721
Common stock, shares outstanding	218,235,064	217,359,337
Income tax expense	$ 7,590	$ 7,752
Legal Surplus Amount	$ 109,338	$ 97,586