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FAIR VALUE - Carrying amounts and estimated fair values of other financial instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial assets:
Held-to-maturity securities, fair value	$ 990,660	$ 1,034,795
Financial liabilities:
Overnight FHLB borrowings	0	768,400
Carrying Value
Financial assets:
Net loans	9,385,121	8,748,335
Held-to-maturity securities, fair value	1,125,540	1,079,695
Financial liabilities:
Deposits	13,030,788	13,012,308
Overnight borrowings	0	768,400
Securities sold under agreement to repurchase, short-term	330,252	346,652
Other Federal Home Loan Bank borrowings	316,837	19,474
Subordinated notes payable	0	3,249
Fair Value
Financial assets:
Net loans	8,836,726	8,696,185
Held-to-maturity securities, fair value	990,660	1,034,795
Financial liabilities:
Deposits	12,997,731	12,981,487
Overnight borrowings	0	768,400
Securities sold under agreement to repurchase, short-term	330,252	346,652
Other Federal Home Loan Bank borrowings	313,111	19,377
Subordinated notes payable	$ 0	$ 3,249

X

- Definition

Borrowings from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and also in times of liquidity shortages. The member institution executes a promissory note, which is generally collateralized by government securities to the Federal Reserve or loans.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of borrowing from Federal Home Loan Bank classified as other.

+ References

No definition available.

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- Definition

Fair value portion of borrowing from Overnight Federal Home Loan Bank with overnight maturities.

+ References

No definition available.

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- Definition

Fair value portion of subordinated notes payable.

+ References

No definition available.

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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

+ Details

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- References

No definition available.

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- References

No definition available.

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ 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))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-5A

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-5

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Publisher FASB
-URI https://asc.fasb.org//310-10/tableOfContent

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- Definition

Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-10

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