FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	$ 4,668,697	$ 4,554,032
MBS [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	3,329,917	3,151,958
Fair Value, Measurements, Recurring [Member]
Assets Fair Value Disclosure [Abstract]
Equity securities	5,005	5,024
Derivative assets	$ 350	$ 345
Derivative Asset Statement Of Financial Position Extensible Enumeration	Other Assets	Other Assets
Derivative Liabilities [Abstract]
Derivative liabilities	$ 162	$ 200
Derivative Liability Statement Of Financial Position Extensible Enumeration	Accrued Liabilities and Other Liabilities	Accrued Liabilities and Other Liabilities
Fair Value, Measurements, Recurring [Member] \| U S Treasury Securities [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	$ 497,254	$ 497,342
Fair Value, Measurements, Recurring [Member] \| Government Agencies Debt Securities [Member] \| Noncallable [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	277,130	336,849
Fair Value, Measurements, Recurring [Member] \| Government Agencies Debt Securities [Member] \| Call Option [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	562,787	566,263
Fair Value, Measurements, Recurring [Member] \| MBS [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	3,329,917	3,151,958
Fair Value, Measurements, Recurring [Member] \| US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	1,609	1,620
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 1 [Member]
Assets Fair Value Disclosure [Abstract]
Equity securities	5,005	5,024
Derivative assets	0	0
Derivative Liabilities [Abstract]
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 1 [Member] \| U S Treasury Securities [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	497,254	497,342
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 1 [Member] \| Government Agencies Debt Securities [Member] \| Noncallable [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 1 [Member] \| Government Agencies Debt Securities [Member] \| Call Option [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 1 [Member] \| MBS [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 1 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 2 [Member]
Assets Fair Value Disclosure [Abstract]
Equity securities	0	0
Derivative assets	350	345
Derivative Liabilities [Abstract]
Derivative liabilities	162	200
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 2 [Member] \| U S Treasury Securities [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 2 [Member] \| Government Agencies Debt Securities [Member] \| Noncallable [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	277,130	336,849
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 2 [Member] \| Government Agencies Debt Securities [Member] \| Call Option [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	562,787	566,263
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 2 [Member] \| MBS [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	3,326,804	3,148,692
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 3 [Member]
Assets Fair Value Disclosure [Abstract]
Equity securities	0	0
Derivative assets	0	0
Derivative Liabilities [Abstract]
Derivative liabilities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 3 [Member] \| U S Treasury Securities [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 3 [Member] \| Government Agencies Debt Securities [Member] \| Noncallable [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 3 [Member] \| Government Agencies Debt Securities [Member] \| Call Option [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 3 [Member] \| MBS [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	3,113	3,266
Fair Value, Measurements, Recurring [Member] \| Fair Value Inputs Level 3 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Assets Fair Value Disclosure [Abstract]
Available-For-Sale Securities, Debt Securities	$ 1,609	$ 1,620

No definition available.

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- Definition

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

+ References

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- Definition

Indicates line item in statement of financial position that includes derivative asset.

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- Definition

Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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