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Allowance for Credit Losses - Schedule of Information Regarding the Aging of Past Due Loans, by Loan Class (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Dec. 31, 2024
Age analysis of past due loans
Total Loans and Leases	$ 18,241,907,000	$ 18,241,907,000	$ 9,779,288,000
Past Due Greater Than 90 Days and Accruing	23,570,000	23,570,000	811,000
Non-accrual	98,630,000	98,630,000	69,349,000
Non-accrual with No Related Allowance	10,053,000	10,053,000	12,153,000
Interest income on nonaccrual loans	0	0
Commercial real estate
Age analysis of past due loans
Total Loans and Leases	7,322,006,000	7,322,006,000	4,027,265,000
Multi-family mortgage
Age analysis of past due loans
Total Loans and Leases	2,130,337,000	2,130,337,000	1,387,796,000
Construction
Age analysis of past due loans
Total Loans and Leases	759,729,000	759,729,000	301,053,000
Commercial
Age analysis of past due loans
Total Loans and Leases	2,729,664,000	2,729,664,000	1,211,714,000
Equipment financing
Age analysis of past due loans
Total Loans and Leases	1,204,048,000	1,204,048,000	1,294,950,000
Residential mortgage
Age analysis of past due loans
Total Loans and Leases	3,278,048,000	3,278,048,000	1,114,732,000
Home Equity
Age analysis of past due loans
Total Loans and Leases	650,746,000	650,746,000	377,411,000
Other consumer
Age analysis of past due loans
Total Loans and Leases	167,329,000	167,329,000	64,367,000
Commercial real estate loans
Age analysis of past due loans
Total Loans and Leases	10,212,072,000	10,212,072,000	5,716,114,000
Past Due Greater Than 90 Days and Accruing	17,952,000	17,952,000	629,000
Non-accrual	33,742,000	33,742,000	18,121,000
Non-accrual with No Related Allowance	1,487,000	1,487,000	7,288,000
Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total Loans and Leases	7,322,006,000	7,322,006,000	4,027,265,000
Past Due Greater Than 90 Days and Accruing	3,612,000	3,612,000	629,000
Non-accrual	30,213,000	30,213,000	11,525,000
Non-accrual with No Related Allowance	1,487,000	1,487,000	683,000
Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total Loans and Leases	2,130,337,000	2,130,337,000	1,387,796,000
Past Due Greater Than 90 Days and Accruing	14,340,000	14,340,000	0
Non-accrual	2,994,000	2,994,000	6,596,000
Non-accrual with No Related Allowance	0	0	6,605,000
Commercial real estate loans | Construction
Age analysis of past due loans
Total Loans and Leases	759,729,000	759,729,000	301,053,000
Past Due Greater Than 90 Days and Accruing	0	0	0
Non-accrual	535,000	535,000	0
Non-accrual with No Related Allowance	0	0	0
Commercial loans and leases
Age analysis of past due loans
Total Loans and Leases	3,933,712,000	3,933,712,000	2,506,664,000
Past Due Greater Than 90 Days and Accruing	1,829,000	1,829,000	0
Non-accrual	55,828,000	55,828,000	46,185,000
Non-accrual with No Related Allowance	8,046,000	8,046,000	2,506,000
Commercial loans and leases | Commercial
Age analysis of past due loans
Total Loans and Leases	2,729,664,000	2,729,664,000	1,211,714,000
Past Due Greater Than 90 Days and Accruing	1,629,000	1,629,000	0
Non-accrual	14,035,000	14,035,000	14,676,000
Non-accrual with No Related Allowance	3,659,000	3,659,000	326,000
Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total Loans and Leases	1,204,048,000	1,204,048,000	1,294,950,000
Past Due Greater Than 90 Days and Accruing	200,000	200,000	0
Non-accrual	41,793,000	41,793,000	31,509,000
Non-accrual with No Related Allowance	4,387,000	4,387,000	2,180,000
Consumer loans
Age analysis of past due loans
Total Loans and Leases	4,096,123,000	4,096,123,000	1,556,510,000
Past Due Greater Than 90 Days and Accruing	3,789,000	3,789,000	182,000
Non-accrual	9,060,000	9,060,000	5,043,000
Non-accrual with No Related Allowance	520,000	520,000	2,359,000
Consumer loans | Residential mortgage
Age analysis of past due loans
Total Loans and Leases	3,278,048,000	3,278,048,000	1,114,732,000
Past Due Greater Than 90 Days and Accruing	3,238,000	3,238,000	130,000
Non-accrual	6,597,000	6,597,000	3,999,000
Non-accrual with No Related Allowance	520,000	520,000	2,359,000
Consumer loans | Home Equity
Age analysis of past due loans
Total Loans and Leases	650,746,000	650,746,000	377,411,000
Past Due Greater Than 90 Days and Accruing	380,000	380,000	52,000
Non-accrual	2,220,000	2,220,000	1,043,000
Non-accrual with No Related Allowance	0	0	0
Consumer loans | Other consumer
Age analysis of past due loans
Total Loans and Leases	167,329,000	167,329,000	64,367,000
Past Due Greater Than 90 Days and Accruing	171,000	171,000	0
Non-accrual	243,000	243,000	1,000
Non-accrual with No Related Allowance	0	0	0
Past Due
Age analysis of past due loans
Total Loans and Leases	141,772,000	141,772,000	73,892,000
Past Due | Commercial real estate loans
Age analysis of past due loans
Total Loans and Leases	45,229,000	45,229,000	29,740,000
Past Due | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total Loans and Leases	26,153,000	26,153,000	20,408,000
Past Due | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total Loans and Leases	18,541,000	18,541,000	9,332,000
Past Due | Commercial real estate loans | Construction
Age analysis of past due loans
Total Loans and Leases	535,000	535,000	0
Past Due | Commercial loans and leases
Age analysis of past due loans
Total Loans and Leases	76,704,000	76,704,000	38,889,000
Past Due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total Loans and Leases	22,638,000	22,638,000	3,171,000
Past Due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total Loans and Leases	54,066,000	54,066,000	35,718,000
Past Due | Consumer loans
Age analysis of past due loans
Total Loans and Leases	19,839,000	19,839,000	5,263,000
Past Due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total Loans and Leases	15,510,000	15,510,000	4,072,000
Past Due | Consumer loans | Home Equity
Age analysis of past due loans
Total Loans and Leases	3,690,000	3,690,000	1,186,000
Past Due | Consumer loans | Other consumer
Age analysis of past due loans
Total Loans and Leases	639,000	639,000	5,000
31-60 days past due
Age analysis of past due loans
Total Loans and Leases	36,826,000	36,826,000	19,193,000
31-60 days past due | Commercial real estate loans
Age analysis of past due loans
Total Loans and Leases	11,008,000	11,008,000	9,433,000
31-60 days past due | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total Loans and Leases	10,856,000	10,856,000	6,570,000
31-60 days past due | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total Loans and Leases	152,000	152,000	2,863,000
31-60 days past due | Commercial real estate loans | Construction
Age analysis of past due loans
Total Loans and Leases	0	0	0
31-60 days past due | Commercial loans and leases
Age analysis of past due loans
Total Loans and Leases	18,570,000	18,570,000	6,923,000
31-60 days past due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total Loans and Leases	5,003,000	5,003,000	783,000
31-60 days past due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total Loans and Leases	13,567,000	13,567,000	6,140,000
31-60 days past due | Consumer loans
Age analysis of past due loans
Total Loans and Leases	7,248,000	7,248,000	2,837,000
31-60 days past due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total Loans and Leases	5,352,000	5,352,000	2,015,000
31-60 days past due | Consumer loans | Home Equity
Age analysis of past due loans
Total Loans and Leases	1,732,000	1,732,000	818,000
31-60 days past due | Consumer loans | Other consumer
Age analysis of past due loans
Total Loans and Leases	164,000	164,000	4,000
61-90 days past due
Age analysis of past due loans
Total Loans and Leases	11,761,000	11,761,000	6,119,000
61-90 days past due | Commercial real estate loans
Age analysis of past due loans
Total Loans and Leases	2,249,000	2,249,000	1,685,000
61-90 days past due | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total Loans and Leases	1,194,000	1,194,000	1,685,000
61-90 days past due | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total Loans and Leases	1,055,000	1,055,000	0
61-90 days past due | Commercial real estate loans | Construction
Age analysis of past due loans
Total Loans and Leases	0	0	0
61-90 days past due | Commercial loans and leases
Age analysis of past due loans
Total Loans and Leases	6,801,000	6,801,000	4,201,000
61-90 days past due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total Loans and Leases	2,386,000	2,386,000	1,693,000
61-90 days past due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total Loans and Leases	4,415,000	4,415,000	2,508,000
61-90 days past due | Consumer loans
Age analysis of past due loans
Total Loans and Leases	2,711,000	2,711,000	233,000
61-90 days past due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total Loans and Leases	1,929,000	1,929,000	0
61-90 days past due | Consumer loans | Home Equity
Age analysis of past due loans
Total Loans and Leases	720,000	720,000	233,000
61-90 days past due | Consumer loans | Other consumer
Age analysis of past due loans
Total Loans and Leases	62,000	62,000	0
Greater than 90 days past due
Age analysis of past due loans
Total Loans and Leases	93,185,000	93,185,000	48,580,000
Greater than 90 days past due | Commercial real estate loans
Age analysis of past due loans
Total Loans and Leases	31,972,000	31,972,000	18,622,000
Greater than 90 days past due | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total Loans and Leases	14,103,000	14,103,000	12,153,000
Greater than 90 days past due | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total Loans and Leases	17,334,000	17,334,000	6,469,000
Greater than 90 days past due | Commercial real estate loans | Construction
Age analysis of past due loans
Total Loans and Leases	535,000	535,000	0
Greater than 90 days past due | Commercial loans and leases
Age analysis of past due loans
Total Loans and Leases	51,333,000	51,333,000	27,765,000
Greater than 90 days past due | Commercial loans and leases | Commercial
Age analysis of past due loans
Total Loans and Leases	15,249,000	15,249,000	695,000
Greater than 90 days past due | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total Loans and Leases	36,084,000	36,084,000	27,070,000
Greater than 90 days past due | Consumer loans
Age analysis of past due loans
Total Loans and Leases	9,880,000	9,880,000	2,193,000
Greater than 90 days past due | Consumer loans | Residential mortgage
Age analysis of past due loans
Total Loans and Leases	8,229,000	8,229,000	2,057,000
Greater than 90 days past due | Consumer loans | Home Equity
Age analysis of past due loans
Total Loans and Leases	1,238,000	1,238,000	135,000
Greater than 90 days past due | Consumer loans | Other consumer
Age analysis of past due loans
Total Loans and Leases	413,000	413,000	1,000
Current
Age analysis of past due loans
Total Loans and Leases	18,100,135,000	18,100,135,000	9,705,396,000
Current | Commercial real estate loans
Age analysis of past due loans
Total Loans and Leases	10,166,843,000	10,166,843,000	5,686,374,000
Current | Commercial real estate loans | Commercial real estate
Age analysis of past due loans
Total Loans and Leases	7,295,853,000	7,295,853,000	4,006,857,000
Current | Commercial real estate loans | Multi-family mortgage
Age analysis of past due loans
Total Loans and Leases	2,111,796,000	2,111,796,000	1,378,464,000
Current | Commercial real estate loans | Construction
Age analysis of past due loans
Total Loans and Leases	759,194,000	759,194,000	301,053,000
Current | Commercial loans and leases
Age analysis of past due loans
Total Loans and Leases	3,857,008,000	3,857,008,000	2,467,775,000
Current | Commercial loans and leases | Commercial
Age analysis of past due loans
Total Loans and Leases	2,707,026,000	2,707,026,000	1,208,543,000
Current | Commercial loans and leases | Equipment financing
Age analysis of past due loans
Total Loans and Leases	1,149,982,000	1,149,982,000	1,259,232,000
Current | Consumer loans
Age analysis of past due loans
Total Loans and Leases	4,076,284,000	4,076,284,000	1,551,247,000
Current | Consumer loans | Residential mortgage
Age analysis of past due loans
Total Loans and Leases	3,262,538,000	3,262,538,000	1,110,660,000
Current | Consumer loans | Home Equity
Age analysis of past due loans
Total Loans and Leases	647,056,000	647,056,000	376,225,000
Current | Consumer loans | Other consumer
Age analysis of past due loans
Total Loans and Leases	$ 166,690,000	$ 166,690,000	$ 64,362,000

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