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Borrowings - Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Borrowings - Long-Term Debt [Line Items]    
Long-Term Debt, Excluding Current Maturities $ 112,790 $ 112,740
Subordinated Debt 49,933 49,885
Capital Trust V Preferred Securites Due 2037 | Junior Subordinated Debt [Member]    
Borrowings - Long-Term Debt [Line Items]    
Long-Term Debt, Excluding Current Maturities 51,516 51,514
Central Bancorp Capital Trust I Securities Due in 2034 | Junior Subordinated Debt [Member]    
Borrowings - Long-Term Debt [Line Items]    
Long-Term Debt, Excluding Current Maturities 5,258 5,258
Central Bancorp Capital Trust II Securities Due in 2037 | Junior Subordinated Debt [Member]    
Borrowings - Long-Term Debt [Line Items]    
Long-Term Debt, Excluding Current Maturities $ 6,083 $ 6,083