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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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LOANS AND LEASES, NET - Summary of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 4,606,695		$ 4,359,681
Net deferred loan origination costs	5,857		6,435
Total gross loans and leases	4,612,552		4,366,116
Allowance for credit losses	(79,836)		(49,705)
Total loans and leases, net	4,532,716		4,316,411
National Lending \| Term lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,533,722		1,308,133
Allowance for credit losses	(30,659)	$ (28,627)	(25,686)	$ (26,638)	$ (28,415)	$ (24,621)
National Lending \| Asset-based lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	473,289		382,371
Allowance for credit losses	(1,234)	(1,215)	(2,738)	(1,303)	(1,081)	(1,050)
National Lending \| Factoring
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	350,740		358,344
Allowance for credit losses	(5,812)	(6,814)	(6,566)	(5,942)	(5,588)	(6,556)
National Lending \| Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	155,044		183,392
Allowance for credit losses	(1,494)	(1,551)	(3,302)	(3,866)	(4,549)	(5,902)
National Lending \| Insurance premium finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	617,054		800,077
Allowance for credit losses	(1,652)	(1,409)	(2,637)	(2,072)	(1,263)	(1,450)
National Lending \| SBA/USDA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	563,689		524,750
Allowance for credit losses	(2,844)	(2,942)	(2,962)	(2,664)	(2,640)	(3,263)
National Lending \| Other commercial finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	166,653		166,091
Allowance for credit losses	(1,399)	(1,720)	(3,089)	(4,079)	(4,332)	(1,310)
National Lending \| Commercial finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	3,860,191		3,723,158
Allowance for credit losses	(45,094)	(44,278)	(46,980)	(46,564)	(47,868)	(44,152)
National Lending \| Consumer finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	253,358		254,416
Allowance for credit losses	(5,639)	(4,576)	(2,346)	(1,843)	(2,965)	(1,463)
National Lending \| Tax services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	43,184		5,192
Allowance for credit losses	(28,653)	(31,528)	(2)	(33,132)	(33,094)	(5)
National Lending \| Warehouse finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	449,962		376,915
Allowance for credit losses	$ (450)	$ (395)	$ (377)	$ (377)	$ (377)	$ (327)