Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Held to Maturity Fair value	$ 123,906	$ 125,658
Allowance for loan and lease losses	$ 183,732	$ 196,362
Preferred stock, shares authorized	50,000,000	50,000,000
Non-cumulative Perpetual Monthly Income Preferred Stock: 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	222,055,125	221,789,509
Common stock, shares outstanding	217,331,577	217,235,140
Legal surplus reserve amount	$ 80,191	$ 80,191
Income Tax Expense	$ 7,752	$ 7,752