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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 |  |

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