CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 68,639,000	$ 37,226,000
Adjustments to reconcile net income to net cash provided by operating activities:
Net gain on sales of securities available-for-sale and other assets	(730,000)	(3,357,000)
Net gain on equity securities	(131,000)	(139,000)
Net gain on sale of loans held for sale	(23,715,000)	(1,946,000)
Loss on termination of derivatives	16,505,000
Net depreciation, amortization and accretion	4,907,000	3,786,000
Amortization of Intangible Assets	1,907,000	0
Stock-based compensation	3,885,000	1,953,000
Provision for credit losses	6,344,000	20,003,000
Originations of loans held for sale	(38,709,000)	(26,007,000)
Proceeds from sale of loans originated for sale	57,558,000	38,789,000
Increase in cash surrender value of BOLI	(4,831,000)	(2,697,000)
Gain from death benefits from BOLI	(350,000)	(1,134,000)
Deferred income tax benefit	(12,704,000)	(6,841,000)
Decrease (increase) in other assets	126,377,000	(17,810,000)
(Decrease) increase in other liabilities	(45,669,000)	6,148,000
Net cash provided by operating activities	159,283,000	47,974,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available-for-sale	138,077,000	68,784,000
Proceeds from sales of marketable equity securities	6,101,000	410,000
Purchases of securities available-for-sale	(1,025,697,000)	(149,353,000)
Purchases of securities held-to-maturity	(40,303,000)
Acquisition of marketable equity securities	0	(136,000)
Proceeds from calls and principal repayments of securities available-for-sale	350,598,000	121,169,000
Purchase of BOLI	(40,000,000)	(40,000,000)
Proceeds received from cash surrender value of BOLI	1,464,000	3,020,000
Loans purchased	(9,855,000)	(18,892,000)
Proceeds from the sale of portfolio loans transferred to held for sale	681,956,000	35,025,000
Net decrease (increase) in loans	244,995,000	(266,490,000)
Purchases of fixed assets, net	(781,000)	(1,442,000)
Redemptions (purchases) of restricted stock, net	46,350,000	(1,286,000)
Net cash received in business combination	715,988,000	0
Net cash provided by (used in) investing activities	1,068,893,000	(249,191,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Increase in deposits	733,744,000	133,042,000
Repayments of FHLBNY advances, long-term	(190,150,000)	(188,800,000)
Repayments of FHLBNY advances, short-term, net	(2,663,865,000)
Proceeds from FHLBNY advances, short-term	1,435,000,000	127,500,000
Proceeds from FHLBNY advances, long-term	25,000,000	97,450,000
Repayments of other short-term borrowings, net	(117,371,000)	(40,000,000)
Proceeds from preferred stock issuance, net	0	116,569,000
Proceeds from exercise of stock options	396,000	38,000
Release of stock for benefit plan awards	779,000	28,000
Payments related to tax withholding for equity awards	(147,000)	(329,000)
BMP ESOP shares received to satisfy distribution of retirement benefits	(993,000)
Treasury shares repurchased	(29,973,000)	(35,356,000)
Redemption of REIT preferred stock	(121,000)
Cash dividends paid to preferred stockholders	(5,465,000)	(2,962,000)
Cash dividends paid to common stockholders	(29,602,000)	(14,168,000)
Net cash (used in) provided by financing activities	(842,768,000)	193,012,000
Increase (decrease) in cash and cash equivalents	385,408,000	(8,205,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	243,603,000	155,488,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	629,011,000	147,283,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes	17,930,000	13,755,000
Cash paid for interest	21,995,000	46,972,000
Loans transferred to held for sale	685,747,000	47,938,000
Loans transferred to held for investment	10,000,000
Premises held for investment transferred to held for sale	2,799,000
Premises held for sale transferred premises and fixed assets, net	0	(514,000)
Operating lease assets in exchange for operating lease liabilities	4,048,000	$ 1,524,000
Cumulative change due to CECL adoption	1,686,000
Net non-cash liabilities assumed in Merger (See Note 2)	$ 324,479,000