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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Jul. 10, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Premiums and discounts on acquired loans	$ 10,581			$ 10,581		$ 2,689
Net deferred origination and factoring fees	3,424			3,424		3,128
Accrued interest on loans	$ 42,827			$ 42,827		$ 36,838
Purchased nonperforming credit deteriorated commercial loan		$ 23,411
Nonperforming credit deteriorated commercial loan purchase price		3,284
Initial ACL on Loans Purchased with Credit Deterioration		10,780
Discount for purchased credit deteriorated commercial loan		9,348
Percentage of factored receivables to total loan portfolio	96.00%			96.00%		97.00%
Customer reserves associated with factored receivables	28.00%			28.00%		26.00%
Loans, net	$ 4,953,373			$ 4,953,373		$ 4,506,246
Pledged loans	1,859,817			1,859,817		1,744,145
Credit loss expense (benefit)	4,284		$ 4,263	$ 4,912	$ 14,314
Discounted cash flow method, reasonable and supportable forecast period				1 year
Allowance for credit losses on loans, reasonable and supportable forecasts not available, historical loss information used, period				2 years
Interest earned on nonaccrual loans	0		0	$ 0	0
Commitments to lend	69			69
Loans to borrowers experiencing financial difficulty that had payment default	0		1,909	0	1,909
Other real estate owned, net	210			$ 210		$ 0
Texas \| Accounts Receivable \| Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of factored receivables				19.00%		22.00%
Colorado \| Accounts Receivable \| Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of factored receivables				11.00%		10.00%
Illinois \| Accounts Receivable \| Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of factored receivables				11.00%		12.00%
Iowa \| Accounts Receivable \| Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of factored receivables				4.00%		4.00%
Texas, Colorado, Illinois, And Iowa \| Accounts Receivable \| Geographic Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of factored receivables				45.00%		48.00%
Loans Held for Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial ACL on Loans Purchased with Credit Deterioration	0		0	$ 10,780	0
Net charge-offs	9,391		3,522	22,992	8,127
Credit loss expense (benefit)	4,249		5,174	5,047	14,151
Changes In Allowance For Credit Losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in allowance for credit losses due to changes in projected loss drivers and prepayment assumptions	156		531	442	2,539
Increase (decrease) in allowance for credit losses due to changes in loan volume and mix	243		(1,068)	2,029
Increase (decrease) in allowance for credit losses due to increase (decrease) in specific reserves	(5,542)		2,189	(9,637)	3,543
Factored receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer reserves associated with factored receivables	290,479			290,479		$ 267,891
Loans, net						19,361
Factored receivables \| United States Postal Service
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	0	$ 19,400		0		19,361	$ 19,400
Factored receivables \| Loans Held for Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial ACL on Loans Purchased with Credit Deterioration	0		0	0	0
Credit loss expense (benefit)	2,310		323	1,181	3,045
1-4 family residential \| Loans Held for Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial ACL on Loans Purchased with Credit Deterioration	0		0	0	0
Credit loss expense (benefit)	243		15	442	71
1-4 family residential \| Real Eatate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential real estate loans in process of foreclosure	0			0		$ 0
Construction, land development, land \| Loans Held for Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial ACL on Loans Purchased with Credit Deterioration	0		0	0	0
Credit loss expense (benefit)	(415)		333	(450)	1,963
Commercial real estate \| Loans Held for Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial ACL on Loans Purchased with Credit Deterioration	0		0	0	0
Credit loss expense (benefit)	306		(206)	733	(798)
Commercial \| Loans Held for Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial ACL on Loans Purchased with Credit Deterioration	0		0	10,780	0
Credit loss expense (benefit)	$ 1,724		$ 4,489	$ 2,486	$ 9,558