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Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
item
Dec. 31, 2024
USD ($)
item
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Amount to be reclassified as an increase to interest income during the next twelve months $ 336,000  
Amount to be reclassified as an increase to interest expense during the next twelve months 327,000  
Two financial institutions    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Cash collateral pledged with financial institutions, dollars $ 1,800,000 $ 2,300,000
Number of financial institutions in which cash collateral pledged | item 2 2
Interest Rate Swap    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Cash collateral pledged with financial institutions, dollars $ 3,900,000 $ 5,200,000
Investment securities pledged with financial institutions, dollars $ 0 $ 0
Number of financial institutions in which cash collateral pledged | item 1 1
Designated as Hedging Instrument    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Derivative assets designated as hedging instruments, fair value $ 3,037,000 $ 3,823,000
Derivative liabilities designated as hedging instruments, fair value 336,000 1,512,000
Designated as Hedging Instrument | Interest Rate Products | Cash flow hedge of junior subordinated debentures and was executed to pay fixed and receive variable rate cash flows    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Notional amount $ 25,800,000 $ 25,800,000
Designated as Hedging Instrument | Interest Rate Products | OSBC Affiliates    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Derivative, number of transactions | item 3 5
Notional amount $ 225,774,000 $ 325,774,000
Derivative assets designated as hedging instruments, fair value 3,037,000 3,823,000
Derivative liabilities designated as hedging instruments, fair value 336,000 1,512,000
Designated as Hedging Instrument | Interest Rate Swap | Cash flow hedges of certain variable rate commercial and commercial real estate loan pools    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Notional amount 200,000,000 300,000,000
Not Designated as Hedging Instrument    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Derivative assets designated as hedging instruments, fair value 1,416,000 1,758,000
Derivative liabilities designated as hedging instruments, fair value $ 1,383,000 $ 1,680,000
Not Designated as Hedging Instrument | Interest Rate Products | Commercial Loan Customers    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Derivative, number of transactions | item 14 13
Notional amount $ 160,263,000 $ 154,137,000
Derivative assets designated as hedging instruments, fair value 1,374,000 1,675,000
Derivative liabilities designated as hedging instruments, fair value 1,374,000 1,675,000
Not Designated as Hedging Instrument | Interest Rate Swap    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Notional amount 127,400,000 121,200,000
Not Designated as Hedging Instrument | Interest rate cap    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Notional amount 32,900,000 32,900,000
Not Designated as Hedging Instrument | Commitments.    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Notional amount $ 12,500,000 $ 8,700,000
Not Designated as Hedging Instrument | Interest Rate Lock Commitments and Forward Contracts.    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Derivative, number of transactions | item 30 30
Notional amount $ 12,508,000 $ 8,667,000
Derivative assets designated as hedging instruments, fair value $ 1,000 $ 55,000
Not Designated as Hedging Instrument | Other Contracts    
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk    
Derivative, number of transactions | item 5 5
Notional amount $ 60,472,000 $ 58,259,000
Derivative assets designated as hedging instruments, fair value 41,000 28,000
Derivative liabilities designated as hedging instruments, fair value $ 9,000 $ 5,000