FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring basis (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	$ 759,461,000	$ 843,524,000
Equity securities with readily determinable fair values	3,360,000	3,029,000
Mortgage servicing rights, at fair value	19,001,000	10,147,000
U.S. Treasury
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	148,622,000	154,515,000
U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	52,097,000	55,157,000
Municipal
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	205,557,000	243,829,000
Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	173,984,000	195,441,000
Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	127,012,000	132,888,000
Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	52,189,000	61,694,000
Fair Value, Recurring
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities with readily determinable fair values	3,360,000	3,029,000
Mortgage servicing rights, at fair value	19,001,000	10,147,000
Derivative financial assets	6,549,000	7,610,000
Derivative financial liabilities	6,227,000	6,981,000
Fair Value, Recurring \| U.S. Treasury
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	148,622,000	154,515,000
Fair Value, Recurring \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	52,097,000	55,157,000
Fair Value, Recurring \| Municipal
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	205,557,000	243,829,000
Fair Value, Recurring \| Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	173,984,000	195,441,000
Fair Value, Recurring \| Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	127,012,000	132,888,000
Fair Value, Recurring \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	52,189,000	61,694,000
Fair Value, Recurring \| Level 1
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities with readily determinable fair values	3,360,000	3,029,000
Mortgage servicing rights, at fair value	0	0
Derivative financial assets	0	0
Derivative financial liabilities	0	0
Fair Value, Recurring \| Level 1 \| U.S. Treasury
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	148,622,000	154,515,000
Fair Value, Recurring \| Level 1 \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	0	0
Fair Value, Recurring \| Level 1 \| Municipal
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	0	0
Fair Value, Recurring \| Level 1 \| Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	0	0
Fair Value, Recurring \| Level 1 \| Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	0	0
Fair Value, Recurring \| Level 1 \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	0	0
Fair Value, Recurring \| Level 2
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities with readily determinable fair values	0	0
Mortgage servicing rights, at fair value	0	0
Derivative financial assets	6,549,000	7,610,000
Derivative financial liabilities	6,227,000	6,981,000
Fair Value, Recurring \| Level 2 \| U.S. Treasury
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	0	0
Fair Value, Recurring \| Level 2 \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	52,097,000	55,157,000
Fair Value, Recurring \| Level 2 \| Municipal
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	205,557,000	243,829,000
Fair Value, Recurring \| Level 2 \| Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	173,984,000	195,441,000
Fair Value, Recurring \| Level 2 \| Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	127,012,000	132,888,000
Fair Value, Recurring \| Level 2 \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	52,189,000	61,694,000
Fair Value, Recurring \| Level 3
FAIR VALUE OF FINANCIAL INSTRUMENTS
Equity securities with readily determinable fair values	0	0
Mortgage servicing rights, at fair value	19,001,000	10,147,000
Derivative financial assets	0	0
Derivative financial liabilities	0	0
Fair Value, Recurring \| Level 3 \| U.S. Treasury
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	0	0
Fair Value, Recurring \| Level 3 \| U.S. government agency
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	0	0
Fair Value, Recurring \| Level 3 \| Municipal
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	0	0
Fair Value, Recurring \| Level 3 \| Agency residential
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	0	0
Fair Value, Recurring \| Level 3 \| Agency commercial
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	0	0
Fair Value, Recurring \| Level 3 \| Corporate
FAIR VALUE OF FINANCIAL INSTRUMENTS
Debt securities available-for-sale:	$ 0	$ 0

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-SubTopic 20
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483466/210-20-50-3

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483444/210-20-55-22

+ Details

Name:	us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement.

+ References

+ Details

Name:	us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482736/825-10-45-1A

+ Details

Name:	us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481229/860-50-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481260/860-50-45-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481260/860-50-45-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481260/860-50-45-2

+ Details

Name:	us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: