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Loans Receivable and Allowance for Loan Losses (Delinquency Status of Total Loans) (Details) - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due $ 11,035,000 $ 14,522,000
Current 2,416,145,000 2,188,793,000
Financing Receivable, Net, Total 2,427,180,000 2,203,315,000
Loans Receivable >90 Days and Accruing 1,724,000 795,000
30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 3,924,000 5,522,000
60 to 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 932,000 2,173,000
Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 6,179,000 6,827,000
Originated loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   8,091,000
Current   2,002,398,000
Financing Receivable, Net, Total   2,010,489,000
Loans Receivable >90 Days and Accruing   142,000
Originated loans [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   4,412,000
Originated loans [Member] | 60 to 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   1,682,000
Originated loans [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   1,997,000
Originated loans [Member] | Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 2,319,000 1,488,000
Current 239,477,000 210,532,000
Financing Receivable, Net, Total 241,796,000 212,020,000
Loans Receivable >90 Days and Accruing 159,000
Originated loans [Member] | Residential [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 1,393,000 1,087,000
Originated loans [Member] | Residential [Member] | 60 to 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 256,000 401,000
Originated loans [Member] | Residential [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 670,000  
Originated loans [Member] | Commercial and Multi-family [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 4,980,000 2,846,000
Current 1,672,688,000 1,482,440,000
Financing Receivable, Net, Total 1,677,668,000 1,485,286,000
Loans Receivable >90 Days and Accruing 1,416,000
Originated loans [Member] | Commercial and Multi-family [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 1,773,000 1,290,000
Originated loans [Member] | Commercial and Multi-family [Member] | 60 to 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 613,000 940,000
Originated loans [Member] | Commercial and Multi-family [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 2,594,000 616,000
Originated loans [Member] | Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 134,769,000 104,996,000
Financing Receivable, Net, Total 134,769,000 104,996,000
Loans Receivable >90 Days and Accruing
Originated loans [Member] | Commercial Business [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 3,067,000 3,417,000
Current 308,137,000 153,996,000
Financing Receivable, Net, Total 311,204,000 157,413,000
Loans Receivable >90 Days and Accruing 149,000 142,000
Originated loans [Member] | Commercial Business [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 516,000 1,874,000
Originated loans [Member] | Commercial Business [Member] | 60 to 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 63,000 278,000
Originated loans [Member] | Commercial Business [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 2,488,000 1,265,000
Originated loans [Member] | Home Equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 669,000 340,000
Current 60,304,000 49,760,000
Financing Receivable, Net, Total 60,973,000 50,100,000
Loans Receivable >90 Days and Accruing
Originated loans [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 242,000 161,000
Originated loans [Member] | Home Equity [Member] | 60 to 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   63,000
Originated loans [Member] | Home Equity [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 427,000 116,000
Originated loans [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 770,000 674,000
Financing Receivable, Net, Total 770,000 674,000
Loans Receivable >90 Days and Accruing
Acquired loans recorded at fair value [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   2,839,000
Current   184,377,000
Financing Receivable, Net, Total   187,216,000
Loans Receivable >90 Days and Accruing   653,000
Acquired loans recorded at fair value [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   1,073,000
Acquired loans recorded at fair value [Member] | 60 to 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   292,000
Acquired loans recorded at fair value [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   1,474,000
Acquired loans recorded at fair value [Member] | Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   812,000
Current   34,198,000
Financing Receivable, Net, Total   35,010,000
Loans Receivable >90 Days and Accruing   97,000
Acquired loans recorded at fair value [Member] | Residential [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   265,000
Acquired loans recorded at fair value [Member] | Residential [Member] | 60 to 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   217,000
Acquired loans recorded at fair value [Member] | Residential [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   330,000
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   949,000
Current   117,628,000
Financing Receivable, Net, Total   118,577,000
Loans Receivable >90 Days and Accruing   556,000
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   318,000
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   631,000
Acquired loans recorded at fair value [Member] | Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable >90 Days and Accruing  
Acquired loans recorded at fair value [Member] | Commercial Business [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   813,000
Current   18,506,000
Financing Receivable, Net, Total   19,319,000
Loans Receivable >90 Days and Accruing  
Acquired loans recorded at fair value [Member] | Commercial Business [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   300,000
Acquired loans recorded at fair value [Member] | Commercial Business [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   513,000
Acquired loans recorded at fair value [Member] | Home Equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   265,000
Current   14,037,000
Financing Receivable, Net, Total   14,302,000
Loans Receivable >90 Days and Accruing  
Acquired loans recorded at fair value [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   190,000
Acquired loans recorded at fair value [Member] | Home Equity [Member] | 60 to 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   75,000
Acquired loans recorded at fair value [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current   8,000
Financing Receivable, Net, Total   8,000
Loans Receivable >90 Days and Accruing  
Acquired loans with deteriorated credit [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   3,592,000
Current   2,018,000
Financing Receivable, Net, Total   5,610,000
Loans Receivable >90 Days and Accruing  
Acquired loans with deteriorated credit [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   37,000
Acquired loans with deteriorated credit [Member] | 60 to 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   199,000
Acquired loans with deteriorated credit [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   3,356,000
Acquired loans with deteriorated credit [Member] | Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current   1,351,000
Financing Receivable, Net, Total   1,351,000
Loans Receivable >90 Days and Accruing  
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   2,500,000
Current   613,000
Financing Receivable, Net, Total   3,113,000
Loans Receivable >90 Days and Accruing  
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   2,500,000
Acquired loans with deteriorated credit [Member] | Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable >90 Days and Accruing  
Acquired loans with deteriorated credit [Member] | Commercial Business [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   856,000
Current   54,000
Financing Receivable, Net, Total   910,000
Loans Receivable >90 Days and Accruing  
Acquired loans with deteriorated credit [Member] | Commercial Business [Member] | Greater than 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   856,000
Acquired loans with deteriorated credit [Member] | Home Equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   236,000
Financing Receivable, Net, Total   236,000
Loans Receivable >90 Days and Accruing  
Acquired loans with deteriorated credit [Member] | Home Equity [Member] | 30 to 59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   37,000
Acquired loans with deteriorated credit [Member] | Home Equity [Member] | 60 to 90 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due   199,000
Acquired loans with deteriorated credit [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable >90 Days and Accruing