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SECURITIES - Schedule of Information Related to the Amortized Cost, Fair Value and Allowance for Credit Losses of Securities Available-for-Sale and Related Gross Unrealized Gains and Losses (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	$ 1,191,864,000	$ 1,182,501,000
Gross Unrealized Gain	1,042,000	100,000
Gross Unrealized Losses	(160,968,000)	(191,175,000)
Allowance for Credit Losses	0	0
Fair Value	1,031,938,000	991,426,000
U.S. Treasury securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	5,011,000
Gross Unrealized Gain	0
Gross Unrealized Losses	(10,000)
Allowance for Credit Losses	0
Fair Value	5,001,000
U.S. government sponsored agencies
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	139,611,000	137,150,000
Gross Unrealized Gain	83,000	0
Gross Unrealized Losses	(22,627,000)	(27,715,000)
Allowance for Credit Losses	0	0
Fair Value	117,067,000	109,435,000
Mortgage-backed securities: residential
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	504,570,000	500,278,000
Gross Unrealized Gain	829,000	83,000
Gross Unrealized Losses	(57,191,000)	(77,952,000)
Allowance for Credit Losses	0	0
Fair Value	448,208,000	422,409,000
State and municipal securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	542,672,000	545,073,000
Gross Unrealized Gain	130,000	17,000
Gross Unrealized Losses	(81,140,000)	(85,508,000)
Allowance for Credit Losses	0	0
Fair Value	$ 461,662,000	$ 459,582,000

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

+ Details

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

X

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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- References

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

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X

- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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

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X

- Definition

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).

+ References

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

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