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Loans Receivable and Allowance for Loan Losses (Delinquency Status of Total Loans) (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | $ 31,062,000 | $ 30,879,000
Current | 2,302,201,000 | 2,299,139,000
Financing Receivable, Net, Total | 2,333,263,000 | 2,330,018,000
Loans Receivable >90 Days and Accruing | 0 | 333,000
30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 17,563,000 | 20,847,000
60 to 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 5,602,000 | 4,178,000
Greater than 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 7,897,000 | 5,854,000
Originated loans [Member] | Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 1,163,000 | 1,437,000
Current | 233,212,000 | 242,932,000
Financing Receivable, Net, Total | 234,375,000 | 244,369,000
Loans Receivable >90 Days and Accruing |  | 125,000
Originated loans [Member] | Residential [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 936,000 | 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 | 227,000 | 664,000
Originated loans [Member] | Commercial & Multi-family [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 20,005,000 | 20,240,000
Current | 1,680,108,000 | 1,670,596,000
Financing Receivable, Net, Total | 1,700,113,000 | 1,690,836,000
Loans Receivable >90 Days and Accruing |  |
Originated loans [Member] | Commercial & Multi-family [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 13,148,000 | 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 | 4,410,000 | 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 | 2,447,000 | 1,334,000
Originated loans [Member] | Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 2,787,000 |
Current | 164,437,000 | 155,967,000
Financing Receivable, Net, Total | 167,224,000 | 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 | 2,787,000 |
Originated loans [Member] | Commercial Business [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 6,406,000 | 8,147,000
Current | 170,934,000 | 176,210,000
Financing Receivable, Net, Total | 177,340,000 | 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 | 457,000 | 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 | 1,153,000 | 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 | 4,796,000 | 3,354,000
Originated loans [Member] | Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 701,000 | 1,055,000
Current | 52,659,000 | 52,612,000
Financing Receivable, Net, Total | 53,360,000 | 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 | 235,000 | 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 | 39,000 | 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 | 427,000 | 502,000
Originated loans [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 851,000 | 822,000
Financing Receivable, Net, Total | 851,000 | 822,000
Loans Receivable >90 Days and Accruing |  |

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