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Loans Receivable and Allowance for Loan Losses (Impaired Loans) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Recorded Investment - With no related allowance recorded $ 31,599,000 $ 25,102,000
Average Recorded Investment - With an allowance recorded 9,497,000 8,324,000
Average Recorded Investment - Total 41,096,000 33,426,000
Interest Income Recognized - With no related allowance recorded 1,266,000 1,064,000
Interest Income Recognized - With an allowance recorded 429,000 334,000
Interest Income Recognized - Total 1,695,000 1,398,000
Recorded Investment - With no related allowance recorded 68,610,000 19,647,000
Recorded Investment - With an allowance recorded 14,591,000 7,265,000
Recorded Investment - Total 83,201,000 26,912,000
Unpaid Principal Balance - With no related allowance recorded 82,212,000 29,082,000
Unpaid Principal Balance - With an allowance recorded 20,722,000 10,270,000
Unpaid Principal Balance - Total 102,934,000 39,352,000
Related Allowance 4,461,000 3,264,000
Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Recorded Investment - With no related allowance recorded 4,511,000 5,374,000
Average Recorded Investment - With an allowance recorded 3,585,000 5,395,000
Interest Income Recognized - With no related allowance recorded 159,000 237,000
Interest Income Recognized - With an allowance recorded 83,000 214,000
Recorded Investment - With no related allowance recorded 4,084,000 4,680,000
Recorded Investment - With an allowance recorded 3,197,000 3,775,000
Unpaid Principal Balance - With no related allowance recorded 4,660,000 5,431,000
Unpaid Principal Balance - With an allowance recorded 3,252,000 3,837,000
Related Allowance 416,000 380,000
Commercial and Multi-family [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Recorded Investment - With no related allowance recorded 21,871,000 16,680,000
Average Recorded Investment - With an allowance recorded 1,993,000 1,451,000
Interest Income Recognized - With no related allowance recorded 760,000 607,000
Interest Income Recognized - With an allowance recorded 76,000 36,000
Recorded Investment - With no related allowance recorded 57,558,000 11,983,000
Recorded Investment - With an allowance recorded 4,296,000 1,248,000
Unpaid Principal Balance - With no related allowance recorded 58,739,000 13,095,000
Unpaid Principal Balance - With an allowance recorded 4,501,000 1,442,000
Related Allowance 378,000 342,000
Commercial Business [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Recorded Investment - With no related allowance recorded [1] 4,117,000 2,102,000
Average Recorded Investment - With an allowance recorded 3,477,000 1,127,000
Interest Income Recognized - With no related allowance recorded [1] 313,000 184,000
Interest Income Recognized - With an allowance recorded 258,000 73,000
Recorded Investment - With no related allowance recorded [1] 5,844,000 2,158,000
Recorded Investment - With an allowance recorded 6,648,000 1,780,000
Unpaid Principal Balance - With no related allowance recorded [1] 17,687,000 9,710,000
Unpaid Principal Balance - With an allowance recorded 12,511,000 4,526,000
Related Allowance 3,640,000 2,518,000
Home Equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average Recorded Investment - With no related allowance recorded [2] 1,100,000 946,000
Average Recorded Investment - With an allowance recorded 442,000 351,000
Interest Income Recognized - With no related allowance recorded [2] 34,000 36,000
Interest Income Recognized - With an allowance recorded 12,000 11,000
Recorded Investment - With no related allowance recorded [2] 1,124,000 826,000
Recorded Investment - With an allowance recorded 450,000 462,000
Unpaid Principal Balance - With no related allowance recorded [2] 1,126,000 846,000
Unpaid Principal Balance - With an allowance recorded 458,000 465,000
Related Allowance $ 27,000 $ 24,000
[1] Includes business lines of credit.
[2] Includes home equity lines of credit.