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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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- Definition Amount, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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