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INVESTMENT SECURITIES - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
investment
security
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
security
investment
Debt Securities, Available-for-Sale [Line Items]      
Accrued interest receivable on debt securities $ 914,000   $ 879,000
Amortized cost of debt securities available-for-sale, at fair value 137,855,000   151,429,000
Held-to-maturity debt securities pledged as collateral $ 53,194,000   $ 53,280,000
Number of available-for-sale debt securities in a gross unrealized loss position | security 84   89
Debt securities, available-for-sale, unrealized loss position, accumulated loss $ (6,706,000)   $ (9,572,000)
Gain (loss) on sale of available-for-sale debt securities $ 0 $ 0  
Number of available-for-sale debt securities with total unrealized losses in a continual loss position for 12 months or longer | security 64   64
Unrealized losses in a continual loss position for 12 months or longer $ 5,839,000   $ 7,632,000
Net unrealized loss on available-for-sale debt securities 6,300,000   9,400,000
AOCI, debt securities, available-for-sale, adjustment, after tax (4,400,000)   (6,600,000)
Estimated Fair Value $ 131,593,000   $ 142,001,000
Number of held-to-maturity debt securities | security 61   61
Debt securities held-to-maturity, unrealized loss position, fair value $ 47,300,000   $ 47,800,000
Unrealized losses on held-to-maturity debt securities 5,865,000   $ 5,457,000
Provision for credit losses on available-for-sale debt securities 0 0  
Provision for credit losses on held-to-maturity debt securities 0 0  
Federal Reserve Bank stock purchased 16,000.0    
FHLB stock purchased $ 0    
Number of banker's ban stocks invested in | investment 2   2
Standard & Poor's, AA Rating And Above      
Debt Securities, Available-for-Sale [Line Items]      
Debt securities, held-to-maturity, amortized cost, before allowance for credit Loss $ 44,200,000   $ 44,700,000
Standard & Poor's, AA- Rating      
Debt Securities, Available-for-Sale [Line Items]      
Debt securities, held-to-maturity, amortized cost, before allowance for credit Loss 3,100,000   3,200,000
Taxable municipals      
Debt Securities, Available-for-Sale [Line Items]      
Amortized cost of debt securities available-for-sale, at fair value 1,007,000   1,007,000
Held-to-maturity debt securities pledged as collateral 553,000   553,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss (89,000)   (98,000)
Unrealized losses in a continual loss position for 12 months or longer 89,000   98,000
Estimated Fair Value 918,000   909,000
Unrealized losses on held-to-maturity debt securities 76,000   90,000
Tax exempt bank-qualified municipals      
Debt Securities, Available-for-Sale [Line Items]      
Amortized cost of debt securities available-for-sale, at fair value 830,000   830,000
Held-to-maturity debt securities pledged as collateral 52,641,000   52,727,000
Debt securities, available-for-sale, unrealized loss position, accumulated loss (2,000)   (4,000)
Unrealized losses in a continual loss position for 12 months or longer 2,000   4,000
Estimated Fair Value 828,000   826,000
Unrealized losses on held-to-maturity debt securities 5,789,000   5,367,000
Other Bank Stock      
Debt Securities, Available-for-Sale [Line Items]      
Equity securities without readily determinable fair values 819,000   819,000
Impairment loss from change in fair value of other equity securities 0 0  
Other Equity Investments      
Debt Securities, Available-for-Sale [Line Items]      
Equity securities without readily determinable fair values 7,100,000   7,100,000
Impairment loss from change in fair value of other equity securities 0 0  
Investment company, committed capital, unfunded 4,000,000.0    
(Distributions from) payments of net capital distribution related to equity investments (68,000) $ (73,000)  
Limited Partnership      
Debt Securities, Available-for-Sale [Line Items]      
Affordable housing projects, aggregate funding commitment 5,600,000   5,700,000
Affordable housing projects, unfunded portion of commitment 1,700,000   1,800,000
Impairment loss from change in fair value of affordable housing project investment 0   $ 0
Asset Pledged as Collateral | Deposits      
Debt Securities, Available-for-Sale [Line Items]      
Amortized cost of debt securities available-for-sale, at fair value 3,000,000.0    
Asset Pledged as Collateral | Federal Reserve Bank Advances      
Debt Securities, Available-for-Sale [Line Items]      
Held-to-maturity debt securities pledged as collateral 53,200,000    
Asset Pledged as Collateral | Letter of Credit      
Debt Securities, Available-for-Sale [Line Items]      
Amortized cost of debt securities available-for-sale, at fair value $ 10,400,000