Loans Receivable and Allowance for Loan Losses (Delinquency Status of Total Loans) (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 22,660,000	$ 30,879,000
Current	2,328,786,000	2,299,139,000
Financing Receivable, Net, Total	2,351,446,000	2,330,018,000
Loans Receivable >90 Days and Accruing	1,749,000	333,000
30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	8,060,000	20,847,000
60 to 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	151,000	4,178,000
Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	14,449,000	5,854,000
Originated loans [Member] \| Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,272,000	1,437,000
Current	228,093,000	242,932,000
Financing Receivable, Net, Total	229,365,000	244,369,000
Loans Receivable >90 Days and Accruing	324,000	125,000
Originated loans [Member] \| Residential [Member] \| 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	773,000	507,000
Originated loans [Member] \| Residential [Member] \| 60 to 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		266,000
Originated loans [Member] \| Residential [Member] \| Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	499,000	664,000
Originated loans [Member] \| Commercial & Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	12,937,000	20,240,000
Current	1,701,911,000	1,670,596,000
Financing Receivable, Net, Total	1,714,848,000	1,690,836,000
Loans Receivable >90 Days and Accruing	1,425,000
Originated loans [Member] \| Commercial & Multi-family [Member] \| 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	5,182,000	15,910,000
Originated loans [Member] \| Commercial & Multi-family [Member] \| 60 to 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		2,996,000
Originated loans [Member] \| Commercial & Multi-family [Member] \| Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	7,755,000	1,334,000
Originated loans [Member] \| Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,861,000
Current	177,451,000	155,967,000
Financing Receivable, Net, Total	181,312,000	155,967,000
Loans Receivable >90 Days and Accruing
Originated loans [Member] \| Construction [Member] \| 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,074,000
Originated loans [Member] \| Construction [Member] \| Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2,787,000
Originated loans [Member] \| Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	4,376,000	8,147,000
Current	167,753,000	176,210,000
Financing Receivable, Net, Total	172,129,000	184,357,000
Loans Receivable >90 Days and Accruing		133,000
Originated loans [Member] \| Commercial Business [Member] \| 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	844,000	3,889,000
Originated loans [Member] \| Commercial Business [Member] \| 60 to 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	151,000	904,000
Originated loans [Member] \| Commercial Business [Member] \| Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	3,381,000	3,354,000
Originated loans [Member] \| Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	214,000	1,055,000
Current	53,119,000	52,612,000
Financing Receivable, Net, Total	53,333,000	53,667,000
Loans Receivable >90 Days and Accruing		75,000
Originated loans [Member] \| Home Equity [Member] \| 30 to 59 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	187,000	541,000
Originated loans [Member] \| Home Equity [Member] \| 60 to 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due		12,000
Originated loans [Member] \| Home Equity [Member] \| Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	27,000	502,000
Originated loans [Member] \| Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	459,000	822,000
Financing Receivable, Net, Total	459,000	822,000
Loans Receivable >90 Days and Accruing