CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 112,497,000	$ 68,639,000
Adjustments to reconcile net income to net cash provided by operating activities:
Net gain on sales of securities available-for-sale and other assets	(1,397,000)	(730,000)
Net gain on equity securities	0	(131,000)
Net gain on sale of loans held for sale	(1,569,000)	(23,715,000)
Loss on termination of derivatives		16,505,000
Net depreciation, amortization and accretion	6,426,000	4,907,000
Amortization of other intangible assets	1,447,000	1,907,000
Loss on extinguishment of debt	740,000	1,751,000
Stock-based compensation	3,228,000	3,885,000
Provision for credit losses	5,039,000	6,344,000
Originations of loans held for sale	(17,128,000)	(38,709,000)
Proceeds from sale of loans originated for sale	34,029,000	57,558,000
Increase in cash surrender value of BOLI	(6,003,000)	(4,831,000)
Gain from death benefits from BOLI	(2,156,000)	(350,000)
(Increase) decrease in other assets	(27,052,000)	111,922,000
Increase (decrease) in other liabilities	139,350,000	(45,669,000)
Net cash provided by operating activities	247,451,000	159,283,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available-for-sale		138,077,000
Proceeds from sales of marketable equity securities		6,101,000
Purchases of securities available-for-sale	(29,742,000)	(1,025,697,000)
Purchases of securities held-to-maturity	(63,210,000)	(40,303,000)
Proceeds from calls and principal repayments of securities available-for-sale	139,974,000	350,598,000
Proceeds from calls and principal repayments of securities held-to-maturity	25,260,000
Purchase of BOLI	(30,000,000)	(40,000,000)
Proceeds received from cash surrender value of BOLI	2,843,000	1,464,000
Loans purchased		(9,855,000)
Proceeds from the sale of portfolio loans transferred to held for sale	13,201,000	681,956,000
Net (increase) decrease in loans	(903,287,000)	244,995,000
Purchases of fixed assets, net	(2,621,000)	(781,000)
(Purchases) redemptions of restricted stock, net	(27,924,000)	46,350,000
Net cash received in business combination	0	715,988,000
Net cash (used in) provided by investing activities	(875,506,000)	1,068,893,000
CASH FLOWS FROM FINANCING ACTIVITIES:
Increase in deposits	29,972,000	733,744,000
Proceeds (repayments) from FHLBNY advances, short-term, net	395,000,000	(1,228,865,000)
Repayments of FHLBNY advances, long-term		(190,150,000)
Proceeds from FHLBNY advances, long-term	200,000,000	25,000,000
Proceeds (repayments) of other short-term borrowings, net	262,000	(117,371,000)
Proceeds from subordinated debentures issuance, net	157,559,000
Redemption of subordinated debentures	(155,000,000)
Proceeds from exercise of stock options		396,000
Release of stock for benefit plan awards	796,000	779,000
Payments related to tax withholding for equity awards	(1,557,000)	(147,000)
BMP ESOP shares received to satisfy distribution of retirement benefits		(993,000)
Purchase of treasury stock	(46,498,000)	(29,973,000)
Redemption of REIT preferred stock		(121,000)
Cash dividends paid to preferred stockholders	(5,465,000)	(5,465,000)
Cash dividends paid to common stockholders	(27,740,000)	(29,602,000)
Net cash provided by (used in) financing activities	547,329,000	(842,768,000)
(Decrease) increase in cash and cash equivalents	(80,726,000)	385,408,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	393,722,000	243,603,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	312,996,000	629,011,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes	35,127,000	17,930,000
Cash paid for interest	22,619,000	21,995,000
Securities available-for-sale transferred to held-to-maturity	372,154,000
Loans transferred to held for sale	27,426,000	685,747,000
Loans transferred to held for investment	4,051,000	10,000,000
Premises transferred to held for sale		2,799,000
Operating lease assets in exchange for operating lease liabilities	$ 2,274,000	4,048,000
Cumulative change due to Current Expected Credit Loss ("CECL") Standard adoption		1,686,000
Net non-cash liabilities assumed in Merger (See Note 2)		$ 324,479,000