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LOAN SERVICING ACTIVITIES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
LOAN SERVICING ACTIVITIES |  |
Bank held borrowers' escrow balances | $ 1,300,000 | $ 2,900,000
Fair value of SRAs | $ 3,349,000 | $ 3,900,000
Weighted average default rate | 0.67 | 1.24
Principal balances outstanding | $ 10,566,831,000 | $ 9,244,661,000
Real estate and C&I loans |  |
LOAN SERVICING ACTIVITIES |  |
Principal balances outstanding | $ 347,900,000 | $ 471,900,000
Minimum |  |
LOAN SERVICING ACTIVITIES |  |
Discount rates | 9.50% | 7.80%
Prepayment speeds | 6.70% | 5.00%
Maximum |  |
LOAN SERVICING ACTIVITIES |  |
Discount rates | 12.00% | 12.00%
Prepayment speeds | 16.00% | 38.00%

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
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