Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Held-to-maturity, at fair value	$ 212,411	$ 193,554
Available-for-sale, at amortized cost	8,396,973	8,041,173
Loans and leases held-for-sale, fair value	$ 107,417	$ 221,784
Preferred stock, par value (dollars per share)	$ 0	$ 0
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)	152,696,133	152,565,504