CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 34,531,000	$ (21,034,000)
Adjustments to reconcile net income to net cash provided by operating activities:
Net gain on sales of securities available-for-sale and other assets		(710,000)
Net gain on equity securities	0	(131,000)
Net gain on sale of loans held for sale	(390,000)	(887,000)
Loss on termination of derivatives		16,505,000
Net depreciation, amortization and accretion	2,768,000	(977,000)
Amortization of other intangible assets	586,000	357,000
Stock-based compensation	1,219,000	836,000
(Credit) provision for credit losses	(1,592,000)	15,779,000
Originations of loans held for sale	(6,179,000)	(12,868,000)
Proceeds from sale of loans originated for sale	9,158,000	20,291,000
Increase in cash surrender value of BOLI	(1,839,000)	(1,340,000)
Decrease in other assets	8,967,000	59,613,000
Increase (decrease) in other liabilities	32,394,000	(84,352,000)
Net cash provided by (used in) operating activities	79,623,000	(8,918,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of securities available-for-sale		134,558,000
Proceeds from sales of marketable equity securities		6,101,000
Purchases of securities available-for-sale	(3,000,000)	(327,222,000)
Purchases of securities held-to-maturity	(31,944,000)
Proceeds from calls and principal repayments of securities available-for-sale	49,853,000	214,029,000
Proceeds from calls and principal repayments of securities held-to-maturity	2,733,000
Proceeds from the sale of portfolio loans transferred to held for sale	1,069,000	3,900,000
Net increase in loans	(23,179,000)	(326,077,000)
(Purchases) sales of fixed assets, net	(1,842,000)	1,651,000
(Purchases) redemptions of restricted stock, net	(1,166,000)	39,006,000
Net cash received in business combination	0	715,988,000
Net cash (used in) provided by investing activities	(7,476,000)	461,934,000
CASH FLOWS FROM FINANCING ACTIVITIES:
(Decrease) increase in deposits	(28,872,000)	870,519,000
Proceeds (repayments) from FHLBNY advances, short-term, net	25,000,000	(745,000,000)
Repayments of FHLBNY advances, long-term		(140,150,000)
Proceeds of other short-term borrowings, net	991,000	6,763,000
Proceeds from exercise of stock options		372,000
Release of stock for benefit plan awards	43,000	192,000
Payments related to tax withholding for equity awards	(1,414,000)
BMP ESOP shares received to satisfy distribution of retirement benefits		(993,000)
Purchase of treasury stock	(17,392,000)
Cash dividends paid to preferred stockholders	(1,821,000)	(1,821,000)
Cash dividends paid to common stockholders	(9,410,000)	(9,778,000)
Net cash used in financing activities	(32,875,000)	(19,896,000)
Increase in cash and cash equivalents	39,272,000	433,120,000
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	393,722,000	243,603,000	$ 243,603,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	432,994,000	676,723,000	$ 393,722,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for income taxes	1,601,000	4,625,000
Cash paid for interest	4,933,000	8,624,000
Securities available-for-sale transferred to held-to-maturity	175,260,000
Loans transferred to held for sale	$ 15,172,000	18,144,000
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