Parent Company Financial Information - STATEMENTS OF FINANCIAL CONDITION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Percentage of capital stock of the Bank held	100.00%
Assets
Other assets	$ 260,204	$ 292,861
Total assets	21,094,429	19,736,544
Liabilities
Subordinated debentures	330,567	501,511
Accrued expenses and other liabilities	203,962	243,207
Total liabilities	18,208,118	16,989,895
Total stockholders’ equity	2,886,311	2,746,649	$ 2,012,594	$ 1,969,697
Total liabilities and stockholders’ equity	21,094,429	19,736,544
Corporation
Assets
Cash and cash equivalents	27,483	96,827
Investment in subsidiaries	3,194,399	3,017,285
Other assets	8,294	1,301
Total assets	3,230,176	3,115,413
Liabilities
Other borrowings	8,000	0
Subordinated debentures	330,567	363,140
Accrued expenses and other liabilities	5,298	5,624
Total liabilities	343,865	368,764
Total stockholders’ equity	2,886,311	2,746,649
Total liabilities and stockholders’ equity	$ 3,230,176	$ 3,115,413