Loans Receivable and Allowance for Loan Losses (Non-Accruing Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 4,495	$ 4,160
Originated loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	2,743	3,126
Originated loans [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	788	590
Originated loans [Member] | Commercial and Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	218	761
Originated loans [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	1,129	1,428
Originated loans [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	608	347
Acquired loans recorded at fair value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	1,752	1,034
Acquired loans recorded at fair value [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	544	291
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	631	217
Acquired loans recorded at fair value [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	513	513
Acquired loans recorded at fair value [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	$ 64	$ 13