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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Participating Mortgage Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance	$ 7,245,952	$ 5,892,229
Unamortized net premiums	18,005	6,535
Unamortized net deferred costs	819	5,331
Unamortized SBA PPP fees	(831)	(1,739)
Fair value adjustment	(12,465)	(3,951)
Total	7,251,480	$ 5,898,405
PMB Acquisition
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value adjustment	(10,600)
PMB Acquisition | PCD loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value adjustment	$ (3,900)

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Amount, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

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Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

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Amount of unamortized loan commitment, origination, and other fees (costs) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Amount of unamortized purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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