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LOANS AND ALLOWANCE FOR LOAN LOSSES - Loan Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of loans
Proceeds of loans sold	$ 22,024	$ 1,477,063	$ 1,611,889
Mortgage fee income	0	33,427	$ 41,045
Loan balance	1,871,447	1,454,801
Deferred loan origination costs and (fees), net	(1,609)	(1,057)
Loans receivable	1,869,838	1,453,744
Servicing asset	347,500	422,000
Purchased credit impaired loans
Components of loans
Loan balance	18,675	39,439
Commercial and non-residential real estate
Components of loans
Loan balance	1,480,527	1,141,114
Commercial and non-residential real estate | Purchased credit impaired loans
Components of loans
Loan balance	13,904	21,008
Residential
Components of loans
Loan balance	306,140	240,264
Residential | Purchased credit impaired loans
Components of loans
Loan balance	4,358	16,943
Home equity
Components of loans
Loan balance	22,186	30,828
Consumer
Components of loans
Loan balance	43,919	3,156
Consumer | Purchased credit impaired loans
Components of loans
Loan balance	$ 413	$ 1,488

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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.

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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) and purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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