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Loans Receivable and Allowance for Loan Losses (Delinquency Status of Total Loans) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | $ 17,015,000 | $ 30,879,000
Current | 2,312,622,000 | 2,299,139,000
Financing Receivable, Net, Total | 2,329,637,000 | 2,330,018,000
Loans Receivable >90 Days and Accruing | 651,000 | 333,000
30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 4,210,000 | 20,847,000
60 to 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 434,000 | 4,178,000
Greater than 90 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 12,371,000 | 5,854,000
Originated loans [Member] | Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 615,000 | 1,437,000
Current | 223,715,000 | 242,932,000
Financing Receivable, Net, Total | 224,330,000 | 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 | 463,000 | 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 | 152,000 | 664,000
Originated loans [Member] | Commercial & Multi-family [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 9,039,000 | 20,240,000
Current | 1,730,937,000 | 1,670,596,000
Financing Receivable, Net, Total | 1,739,976,000 | 1,690,836,000
Loans Receivable >90 Days and Accruing | 651,000 |
Originated loans [Member] | Commercial & Multi-family [Member] | 30 to 59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 2,992,000 | 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 | 6,047,000 | 1,334,000
Originated loans [Member] | Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 2,787,000 |
Current | 146,289,000 | 155,967,000
Financing Receivable, Net, Total | 149,076,000 | 155,967,000
Loans Receivable >90 Days and Accruing |  |
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 | 4,509,000 | 8,147,000
Current | 156,907,000 | 176,210,000
Financing Receivable, Net, Total | 161,416,000 | 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 | 723,000 | 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 | 434,000 | 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 | 3,352,000 | 3,354,000
Originated loans [Member] | Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Past Due | 65,000 | 1,055,000
Current | 52,044,000 | 52,612,000
Financing Receivable, Net, Total | 52,109,000 | 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 | 32,000 | 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 | 33,000 | 502,000
Originated loans [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 2,730,000 | 822,000
Financing Receivable, Net, Total | 2,730,000 | 822,000
Loans Receivable >90 Days and Accruing |  |

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