CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
ASSETS
Securities—trading, amortized cost basis	$ 27,203	$ 27,203
Securities—available-for-sale, amortized cost basis	1,544,513	1,529,946
Securities—held-to-maturity, fair value	$ 449,237	$ 237,805
SHAREHOLDERS’ EQUITY
Preferred stock, share par value	$ 0.01
Preferred stock, shares authorized	500,000
Preferred stock, shares outstanding	0
Voting Common Stock [Member]
SHAREHOLDERS’ EQUITY
Common stock, share par value	$ 0.01
Common stock, shares authorized	50,000,000
Common stock, shares issued	35,102,459	35,712,384
Common stock, shares outstanding	35,102,459	35,712,384
Nonvoting Common Stock [Member]
SHAREHOLDERS’ EQUITY
Common stock, share par value	$ 0.01
Common stock, shares authorized	5,000,000
Common stock, shares issued	0	39,192
Common stock, shares outstanding	0	39,192
Loans [Member] | Recurring [Member]
ASSETS
Loans Held-for-sale, Fair Value Disclosure	$ 169,239	$ 199,397