Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Held to Maturity Fair value	$ 125,658	$ 131,032
Allowance for loan and lease losses	$ 196,362	$ 231,843
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	221,789,509	220,382,343
Common stock, shares outstanding	217,235,140	216,278,040
Income tax expense	$ 7,752	$ 7,752
Legal Surplus Amount	$ 80,191	$ 59,693