LOANS AND LEASES, NET - Credit Quality Indicator (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2025
Financing Receivable, Credit Quality Indicator [Line Items]
Total gross loans and leases	$ 4,982,855		$ 4,664,908
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2026	412,018		1,068,007
2025	967,669		544,490
2024	424,689		428,620
2023	361,868		238,299
2022	198,276		76,450
Prior	227,230		133,867
Revolving Loans and Leases	1,105,211		1,125,666
Total gross loans and leases	3,696,961		3,615,399
Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2026	2,218		81,912
2025	114,946		81,624
2024	145,000		71,304
2023	19,125		20,334
2022	21,248		30,632
Prior	74,563		16,955
Revolving Loans and Leases	314,918		269,759
Total gross loans and leases	692,018		572,520
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		2,738
2025	3,943		70,280
2024	9,021		3,985
2023	34,954		826
2022	3,005		11,585
Prior	19,163		1,147
Revolving Loans and Leases	32,664		32,096
Total gross loans and leases	102,750		122,657
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2026	659		37,297
2025	32,041		27,842
2024	42,093		56,392
2023	52,932		23,192
2022	23,182		22,373
Prior	106,816		51,488
Revolving Loans and Leases	29,162		26,267
Total gross loans and leases	286,885		244,851
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		221
2025	1,532		3,251
2024	3,386		2,516
2023	775		3,854
2022	1,346		1,652
Prior	274		70
Revolving Loans and Leases	2,919		2,164
Total gross loans and leases	10,232		13,728
Total
Financing Receivable, Credit Quality Indicator [Line Items]
2026	414,895		1,190,175
2025	1,120,131		727,487
2024	624,189		562,817
2023	469,654		286,505
2022	247,057		142,692
Prior	428,046		203,527
Revolving Loans and Leases	1,484,874		1,455,952
Total gross loans and leases	4,788,846		4,569,155
National Lending | Total
Financing Receivable, Credit Quality Indicator [Line Items]
2026, Writeoffs	0		74
2025, Writeoffs	0		8,762
2024, Writeoffs	409		5,380
2023, Writeoffs	664		3,347
2022, Writeoffs	333		2,051
Prior, Writeoffs	173		1,531
Revolving Loans and Leases, Writeoffs	0		7,090
Total, Writeoffs	1,579		28,235
National Lending | Term lending
Financing Receivable, Credit Quality Indicator [Line Items]
Total, Writeoffs	1,081	$ 8,375
National Lending | Term lending | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2026	342,319		935,599
2025	879,125		399,968
2024	272,639		298,678
2023	257,255		99,820
2022	91,021		43,216
Prior	85,413		35,971
Revolving Loans and Leases	0		0
Total gross loans and leases	1,927,772		1,813,252
National Lending | Term lending | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2026	1,939		65,674
2025	107,434		71,326
2024	122,665		68,737
2023	18,390		7,222
2022	10,997		28,882
Prior	70,898		13,357
Revolving Loans and Leases	0		0
Total gross loans and leases	332,323		255,198
National Lending | Term lending | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		56
2025	3,837		68,989
2024	8,666		3,762
2023	34,954		826
2022	1,566		11,078
Prior	14,993		65
Revolving Loans and Leases	0		0
Total gross loans and leases	64,016		84,776
National Lending | Term lending | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		29,792
2025	29,102		24,666
2024	31,402		37,845
2023	37,697		14,137
2022	10,273		16,050
Prior	67,536		19,995
Revolving Loans and Leases	0		0
Total gross loans and leases	176,010		142,485
National Lending | Term lending | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	1,249		564
2024	3,386		774
2023	625		3,854
2022	1,122		1,615
Prior	274		22
Revolving Loans and Leases	0		0
Total gross loans and leases	6,656		6,829
National Lending | Term lending | Total
Financing Receivable, Credit Quality Indicator [Line Items]
2026	344,258		1,031,121
2025	1,020,747		565,513
2024	438,758		409,796
2023	348,921		125,859
2022	114,979		100,841
Prior	239,114		69,410
Revolving Loans and Leases	0		0
Total gross loans and leases	2,506,777		2,302,540
2026, Writeoffs	0		0
2025, Writeoffs	0		7,818
2024, Writeoffs	288		4,492
2023, Writeoffs	309		3,257
2022, Writeoffs	333		991
Prior, Writeoffs	151		419
Revolving Loans and Leases, Writeoffs	0		0
Total, Writeoffs	1,081		16,977
National Lending | Asset-based lending
Financing Receivable, Credit Quality Indicator [Line Items]
Total, Writeoffs	0	0
National Lending | Asset-based lending | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	294,153		301,128
Total gross loans and leases	294,153		301,128
National Lending | Asset-based lending | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	271,721		233,541
Total gross loans and leases	271,721		233,541
National Lending | Asset-based lending | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	32,664		31,702
Total gross loans and leases	32,664		31,702
National Lending | Asset-based lending | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	27,860		24,730
Total gross loans and leases	27,860		24,730
National Lending | Asset-based lending | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	2,919		2,164
Total gross loans and leases	2,919		2,164
National Lending | Asset-based lending | Total
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	629,317		593,265
Total gross loans and leases	629,317		593,265
2026, Writeoffs	0		0
2025, Writeoffs	0		0
2024, Writeoffs	0		0
2023, Writeoffs	0		0
2022, Writeoffs	0		0
Prior, Writeoffs	0		0
Revolving Loans and Leases, Writeoffs	0		5,611
Total, Writeoffs	0		5,611
National Lending | Factoring
Financing Receivable, Credit Quality Indicator [Line Items]
Total, Writeoffs	0	74
National Lending | Factoring | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	169,389		179,352
Total gross loans and leases	169,389		179,352
National Lending | Factoring | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	43,197		36,218
Total gross loans and leases	43,197		36,218
National Lending | Factoring | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2026			0
2025			0
2024			0
2023			0
2022			0
Prior			0
Revolving Loans and Leases			394
Total gross loans and leases			394
National Lending | Factoring | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	1,302		1,537
Total gross loans and leases	1,302		1,537
National Lending | Factoring | Total
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	213,888		217,501
Total gross loans and leases	213,888		217,501
2026, Writeoffs	0		0
2025, Writeoffs	0		0
2024, Writeoffs	0		0
2023, Writeoffs	0		0
2022, Writeoffs	0		0
Prior, Writeoffs	0		0
Revolving Loans and Leases, Writeoffs	0		1,479
Total, Writeoffs	0		1,479
National Lending | Lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Total, Writeoffs	22	63
National Lending | Lease financing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2026	16,080		43,710
2025	14,142		20,259
2024	30,547		36,483
2023	32,626		2,270
2022	1,744		1,089
Prior	2,920		4,439
Revolving Loans and Leases	0		0
Total gross loans and leases	98,059		108,250
National Lending | Lease financing | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2026	29		13,587
2025	3,783		5,181
2024	15,118		13
2023	618		635
2022	0		1,059
Prior	36		0
Revolving Loans and Leases	0		0
Total gross loans and leases	19,584		20,475
National Lending | Lease financing | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		941
2024	275		223
2023	0		0
2022	503		181
Prior	567		44
Revolving Loans and Leases	0		0
Total gross loans and leases	1,345		1,389
National Lending | Lease financing | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		7,190
2025	1,067		0
2024	3,873		5,375
2023	5,206		1,377
2022	1,144		4,088
Prior	6,077		905
Revolving Loans and Leases	0		0
Total gross loans and leases	17,367		18,935
National Lending | Lease financing | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		150
2023	150		0
2022	0		37
Prior	0		0
Revolving Loans and Leases	0		0
Total gross loans and leases	150		187
National Lending | Lease financing | Total
Financing Receivable, Credit Quality Indicator [Line Items]
2026	16,109		64,487
2025	18,992		26,381
2024	49,813		42,244
2023	38,600		4,282
2022	3,391		6,454
Prior	9,600		5,388
Revolving Loans and Leases	0		0
Total gross loans and leases	136,505		149,236
2026, Writeoffs	0		0
2025, Writeoffs	0		0
2024, Writeoffs	0		320
2023, Writeoffs	0		0
2022, Writeoffs	0		1,005
Prior, Writeoffs	22		101
Revolving Loans and Leases, Writeoffs	0		0
Total, Writeoffs	22		1,426
National Lending | Insurance premium finance
Financing Receivable, Credit Quality Indicator [Line Items]
Total, Writeoffs		93
National Lending | Insurance premium finance | Total
Financing Receivable, Credit Quality Indicator [Line Items]
2026, Writeoffs			0
2025, Writeoffs			62
2024, Writeoffs			31
2023, Writeoffs			0
2022, Writeoffs			0
Prior, Writeoffs			0
Revolving Loans and Leases, Writeoffs			0
Total, Writeoffs			93
National Lending | SBA/USDA
Financing Receivable, Credit Quality Indicator [Line Items]
Total, Writeoffs	476	297
National Lending | SBA/USDA | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2026	51,619		79,928
2025	65,447		61,063
2024	61,610		93,459
2023	71,987		136,075
2022	105,511		19,674
Prior	69,953		30,962
Revolving Loans and Leases	0		0
Total gross loans and leases	426,127		421,161
National Lending | SBA/USDA | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2026	250		2,651
2025	3,729		5,117
2024	7,217		136
2023	117		12,477
2022	10,251		691
Prior	3,629		3,598
Revolving Loans and Leases	0		0
Total gross loans and leases	25,193		24,670
National Lending | SBA/USDA | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		2,682
2025	106		350
2024	80		0
2023	0		0
2022	936		326
Prior	3,603		1,038
Revolving Loans and Leases	0		0
Total gross loans and leases	4,725		4,396
National Lending | SBA/USDA | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2026	659		315
2025	1,872		3,176
2024	6,818		12,721
2023	10,029		7,678
2022	11,765		2,235
Prior	32,766		30,588
Revolving Loans and Leases	0		0
Total gross loans and leases	63,909		56,713
National Lending | SBA/USDA | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		221
2025	283		2,687
2024	0		1,592
2023	0		0
2022	224		0
Prior	0		48
Revolving Loans and Leases	0		0
Total gross loans and leases	507		4,548
National Lending | SBA/USDA | Total
Financing Receivable, Credit Quality Indicator [Line Items]
2026	52,528		85,797
2025	71,437		72,393
2024	75,725		107,908
2023	82,133		156,230
2022	128,687		22,926
Prior	109,951		66,234
Revolving Loans and Leases	0		0
Total gross loans and leases	520,461		511,488
2026, Writeoffs	0		74
2025, Writeoffs	0		882
2024, Writeoffs	121		537
2023, Writeoffs	355		90
2022, Writeoffs	0		55
Prior, Writeoffs	0		1,011
Revolving Loans and Leases, Writeoffs	0		0
Total, Writeoffs	476		2,649
National Lending | Other commercial finance
Financing Receivable, Credit Quality Indicator [Line Items]
Total, Writeoffs	0	0
National Lending | Other commercial finance | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2026	2,000		8,770
2025	8,955		63,200
2024	59,893		0
2023	0		134
2022	0		12,471
Prior	68,944		62,495
Revolving Loans and Leases	0		0
Total gross loans and leases	139,792		147,070
National Lending | Other commercial finance | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2026			0
2025			0
2024			2,418
2023			0
2022			0
Prior			0
Revolving Loans and Leases			0
Total gross loans and leases			2,418
National Lending | Other commercial finance | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		451
2023	0		0
2022	0		0
Prior	437		0
Revolving Loans and Leases	0		0
Total gross loans and leases	437		451
National Lending | Other commercial finance | Total
Financing Receivable, Credit Quality Indicator [Line Items]
2026	2,000		8,770
2025	8,955		63,200
2024	59,893		2,869
2023	0		134
2022	0		12,471
Prior	69,381		62,495
Revolving Loans and Leases	0		0
Total gross loans and leases	140,229		149,939
2026, Writeoffs	0		0
2025, Writeoffs	0		0
2024, Writeoffs	0		0
2023, Writeoffs	0		0
2022, Writeoffs	0		0
Prior, Writeoffs	0		0
Revolving Loans and Leases, Writeoffs	0		0
Total, Writeoffs	0		0
National Lending | Warehouse finance
Financing Receivable, Credit Quality Indicator [Line Items]
Total, Writeoffs	0	$ 0
National Lending | Warehouse finance | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	641,669		645,186
Total gross loans and leases	641,669		645,186
National Lending | Warehouse finance | Total
Financing Receivable, Credit Quality Indicator [Line Items]
2026	0		0
2025	0		0
2024	0		0
2023	0		0
2022	0		0
Prior	0		0
Revolving Loans and Leases	641,669		645,186
Total gross loans and leases	641,669		645,186
2026, Writeoffs	0		0
2025, Writeoffs	0		0
2024, Writeoffs	0		0
2023, Writeoffs	0		0
2022, Writeoffs	0		0
Prior, Writeoffs	0		0
Revolving Loans and Leases, Writeoffs	0		0
Total, Writeoffs	$ 0		$ 0