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Loans Receivable and Allowance for Loan Losses (Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	$ 20,880	$ 24,844	$ 19,258	$ 26,919
Average Recorded Investment - With an allowance recorded	8,202	9,225	7,799	8,674
Interest Income Recognized - With no related allowance recorded	111	239	587	845
Interest Income Recognized - With an allowance recorded	87	74	218	256
Recorded Investment - With no related allowance recorded	22,903		22,903		$ 19,647
Recorded Investment - With an allowance recorded	8,415		8,415		7,265
Recorded Investment - Total	31,318		31,318		26,912
Unpaid Principal Balance - With no related allowance recorded	31,217		31,217		29,082
Unpaid Principal Balance - With an allowance recorded	12,815		12,815		10,270
Unpaid Principal Balance - Total	44,032		44,032		39,352
Related Allowance	3,853		3,853		3,264
Originated loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	12,474	12,563	10,819	14,094
Average Recorded Investment - With an allowance recorded	2,656	3,122	2,563	3,062
Interest Income Recognized - With no related allowance recorded	57	125	351	520
Interest Income Recognized - With an allowance recorded	66	22	109	129
Recorded Investment - With no related allowance recorded	14,202		14,202		8,171
Recorded Investment - With an allowance recorded	3,105		3,105		2,755
Unpaid Principal Balance - With no related allowance recorded	16,501		16,501		11,287
Unpaid Principal Balance - With an allowance recorded	5,899		5,899		4,392
Related Allowance	1,509		1,509		1,097
Originated loans [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	2,125	2,179	2,076	2,627
Average Recorded Investment - With an allowance recorded	908	2,032	910	2,175
Interest Income Recognized - With no related allowance recorded	11	20	51	66
Interest Income Recognized - With an allowance recorded		18	10	67
Recorded Investment - With no related allowance recorded	2,278		2,278		2,010
Recorded Investment - With an allowance recorded	904		904		973
Unpaid Principal Balance - With no related allowance recorded	2,381		2,381		2,098
Unpaid Principal Balance - With an allowance recorded	906		906		973
Related Allowance	37		37		48
Originated loans [Member] | Commercial and Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	5,867	8,655	5,211	9,680
Interest Income Recognized - With no related allowance recorded	8	56	98	310
Recorded Investment - With no related allowance recorded	7,842		7,842		4,469
Unpaid Principal Balance - With no related allowance recorded	7,891		7,891		4,527
Originated loans [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	3,516	1,131	2,677	1,138
Average Recorded Investment - With an allowance recorded	1,427	822	1,314	658
Interest Income Recognized - With no related allowance recorded	32	43	183	126
Interest Income Recognized - With an allowance recorded	65	3	93	57
Recorded Investment - With no related allowance recorded	3,144		3,144		1,108
Recorded Investment - With an allowance recorded	1,829		1,829		1,403
Unpaid Principal Balance - With no related allowance recorded	5,289		5,289		4,069
Unpaid Principal Balance - With an allowance recorded	4,614		4,614		3,037
Related Allowance	1,448		1,448		1,029
Originated loans [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	966	598	855	649
Average Recorded Investment - With an allowance recorded	321	268	339	229
Interest Income Recognized - With no related allowance recorded	6	6	19	18
Interest Income Recognized - With an allowance recorded	1	1	6	5
Recorded Investment - With no related allowance recorded	938		938		584
Recorded Investment - With an allowance recorded	372		372		379
Unpaid Principal Balance - With no related allowance recorded	940		940		593
Unpaid Principal Balance - With an allowance recorded	379		379		382
Related Allowance	24		24		20
Acquired loans recorded at fair value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	5,836	6,243	5,914	6,369
Average Recorded Investment - With an allowance recorded	5,206	4,633	4,836	4,510
Interest Income Recognized - With no related allowance recorded	24	93	160	261
Interest Income Recognized - With an allowance recorded	21	45	102	108
Recorded Investment - With no related allowance recorded	5,983		5,983		6,632
Recorded Investment - With an allowance recorded	5,149		5,149		3,986
Unpaid Principal Balance - With no related allowance recorded	6,083		6,083		7,147
Unpaid Principal Balance - With an allowance recorded	6,755		6,755		5,307
Related Allowance	2,343		2,343		2,160
Acquired loans recorded at fair value [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	1,555	1,931	1,647	2,081
Average Recorded Investment - With an allowance recorded	2,472	3,291	2,404	3,286
Interest Income Recognized - With no related allowance recorded	5	23	41	73
Interest Income Recognized - With an allowance recorded	3	30	33	82
Recorded Investment - With no related allowance recorded	1,562		1,562		1,843
Recorded Investment - With an allowance recorded	2,470		2,470		2,278
Unpaid Principal Balance - With no related allowance recorded	1,660		1,660		1,950
Unpaid Principal Balance - With an allowance recorded	2,504		2,504		2,293
Related Allowance	347		347		325
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	4,060	3,882	4,053	3,898
Average Recorded Investment - With an allowance recorded	1,221	881	1,225	889
Interest Income Recognized - With no related allowance recorded	19	55	113	165
Interest Income Recognized - With an allowance recorded		14	20	22
Recorded Investment - With no related allowance recorded	4,227		4,227		4,401
Recorded Investment - With an allowance recorded	1,216		1,216		1,248
Unpaid Principal Balance - With no related allowance recorded	4,227		4,227		4,402
Unpaid Principal Balance - With an allowance recorded	1,417		1,417		1,442
Related Allowance	313		313		342
Acquired loans recorded at fair value [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded		119		96
Average Recorded Investment - With an allowance recorded	1,403	377	1,106	251
Interest Income Recognized - With no related allowance recorded		12		14
Interest Income Recognized - With an allowance recorded	17		47
Recorded Investment - With no related allowance recorded					183
Recorded Investment - With an allowance recorded	1,325		1,325		377
Unpaid Principal Balance - With no related allowance recorded					589
Unpaid Principal Balance - With an allowance recorded	2,695		2,695		1,489
Related Allowance	1,680		1,680		1,489
Acquired loans recorded at fair value [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	221	311	214	294
Average Recorded Investment - With an allowance recorded	110	84	101	84
Interest Income Recognized - With no related allowance recorded		3	6	9
Interest Income Recognized - With an allowance recorded	1	1	2	4
Recorded Investment - With no related allowance recorded	194		194		205
Recorded Investment - With an allowance recorded	138		138		83
Unpaid Principal Balance - With no related allowance recorded	196		196		206
Unpaid Principal Balance - With an allowance recorded	139		139		83
Related Allowance	3		3		4
Acquired loans with deteriorated credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	2,570	6,038	2,525	6,456
Average Recorded Investment - With an allowance recorded	340	1,470	400	1,102
Interest Income Recognized - With no related allowance recorded	30	21	76	64
Interest Income Recognized - With an allowance recorded		7	7	19
Recorded Investment - With no related allowance recorded	2,718		2,718		4,844
Recorded Investment - With an allowance recorded	161		161		524
Unpaid Principal Balance - With no related allowance recorded	8,633		8,633		10,648
Unpaid Principal Balance - With an allowance recorded	161		161		571
Related Allowance	1		1		7
Acquired loans with deteriorated credit [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	984	839	929	898
Average Recorded Investment - With an allowance recorded	340	527	400	473
Interest Income Recognized - With no related allowance recorded		14	28	44
Interest Income Recognized - With an allowance recorded		7	7	19
Recorded Investment - With no related allowance recorded	1,158		1,158		827
Recorded Investment - With an allowance recorded	161		161		524
Unpaid Principal Balance - With no related allowance recorded	1,762		1,762		1,383
Unpaid Principal Balance - With an allowance recorded	161		161		571
Related Allowance	1		1		7
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	705	4,264	710	4,666
Average Recorded Investment - With an allowance recorded		943		629
Interest Income Recognized - With no related allowance recorded	9	7	23	20
Recorded Investment - With no related allowance recorded	695		695		3,113
Unpaid Principal Balance - With no related allowance recorded	1,749		1,749		4,166
Acquired loans with deteriorated credit [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	864	894	864	849
Interest Income Recognized - With no related allowance recorded	21		25
Recorded Investment - With no related allowance recorded	865		865		867
Unpaid Principal Balance - With no related allowance recorded	5,122		5,122		5,052
Acquired loans with deteriorated credit [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	$ 17	$ 41	$ 22	$ 43
Recorded Investment - With no related allowance recorded					37
Unpaid Principal Balance - With no related allowance recorded					$ 47

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