Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Available-for-sale, at fair value	$ 8,041,173	$ 6,639,277
Held-to-maturity, at fair value	193,554	144,844
Loans and leases held-for-sale, fair value	$ 221,784	$ 91,202
Preferred stock, par value (dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	7,000	7,000
Common stock, par value (dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	220,000,000	220,000,000
Common stock, shares issued (in shares)	152,565,504	152,965,571