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Loans Receivable and Allowance for Loan Losses (Non-Accruing Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 7,151 | $ 4,160
Originated loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 5,160 | 3,126
Originated loans [Member] | Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 847 | 590
Originated loans [Member] | Commercial and Multi-family [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 457 | 761
Originated loans [Member] | Commercial Business [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 3,252 | 1,428
Originated loans [Member] | Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 604 | 347
Acquired loans recorded at fair value [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 1,991 | 1,034
Acquired loans recorded at fair value [Member] | Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 565 | 291
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 979 | 217
Acquired loans recorded at fair value [Member] | Commercial Business [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | 378 | 513
Acquired loans recorded at fair value [Member] | Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-accrual loans | $ 69 | $ 13

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