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Loans Receivable and Allowance for Loan Losses (Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	$ 17,471	$ 29,926	$ 18,176	$ 30,930
Average Recorded Investment - With an allowance recorded	7,493	8,040	7,415	8,517
Interest Income Recognized - With no related allowance recorded	273	290	476	606
Interest Income Recognized - With an allowance recorded	63	93	131	182
Recorded Investment - With no related allowance recorded	18,851		18,851		$ 19,647
Recorded Investment - With an allowance recorded	7,987		7,987		7,265
Recorded Investment - Total	26,838		26,838		26,912
Unpaid Principal Balance - With no related allowance recorded	29,142		29,142		29,082
Unpaid Principal Balance - With an allowance recorded	10,797		10,797		10,270
Unpaid Principal Balance - Total	39,939		39,939		39,352
Related Allowance	3,401		3,401		3,264
Originated loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	9,129	16,142	8,810	16,451
Average Recorded Investment - With an allowance recorded	2,292	3,178	2,445	3,813
Interest Income Recognized - With no related allowance recorded	182	185	294	395
Interest Income Recognized - With an allowance recorded	29	53	43	107
Recorded Investment - With no related allowance recorded	10,743		10,743		8,171
Recorded Investment - With an allowance recorded	2,205		2,205		2,755
Unpaid Principal Balance - With no related allowance recorded	15,134		15,134		11,287
Unpaid Principal Balance - With an allowance recorded	2,953		2,953		4,392
Related Allowance	1,015		1,015		1,097
Originated loans [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	1,976	2,818	1,987	2,753
Average Recorded Investment - With an allowance recorded	914	2,452	933	2,775
Interest Income Recognized - With no related allowance recorded	20	18	40	46
Interest Income Recognized - With an allowance recorded	2	24	10	49
Recorded Investment - With no related allowance recorded	1,971		1,971		2,010
Recorded Investment - With an allowance recorded	911		911		973
Unpaid Principal Balance - With no related allowance recorded	2,070		2,070		2,098
Unpaid Principal Balance - With an allowance recorded	911		911		973
Related Allowance	38		38		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	3,896	11,499	4,087	11,903
Average Recorded Investment - With an allowance recorded				37
Interest Income Recognized - With no related allowance recorded	45	120	90	254
Recorded Investment - With no related allowance recorded	3,891		3,891		4,469
Unpaid Principal Balance - With no related allowance recorded	3,936		3,936		4,527
Originated loans [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	2,444	1,145	1,999	1,088
Average Recorded Investment - With an allowance recorded	1,056	574	1,171	849
Interest Income Recognized - With no related allowance recorded	110	41	151	83
Interest Income Recognized - With an allowance recorded	25	27	28	54
Recorded Investment - With no related allowance recorded	3,887		3,887		1,108
Recorded Investment - With an allowance recorded	1,025		1,025		1,403
Unpaid Principal Balance - With no related allowance recorded	8,133		8,133		4,069
Unpaid Principal Balance - With an allowance recorded	1,768		1,768		3,037
Related Allowance	960		960		1,029
Originated loans [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	813	680	737	707
Average Recorded Investment - With an allowance recorded	322	152	341	152
Interest Income Recognized - With no related allowance recorded	7	6	13	12
Interest Income Recognized - With an allowance recorded	2	2	5	4
Recorded Investment - With no related allowance recorded	994		994		584
Recorded Investment - With an allowance recorded	269		269		379
Unpaid Principal Balance - With no related allowance recorded	995		995		593
Unpaid Principal Balance - With an allowance recorded	274		274		382
Related Allowance	17		17		20
Acquired loans recorded at fair value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	5,911	6,520	6,131	6,800
Average Recorded Investment - With an allowance recorded	4,681	4,415	4,449	4,284
Interest Income Recognized - With no related allowance recorded	68	84	136	168
Interest Income Recognized - With an allowance recorded	34	33	81	63
Recorded Investment - With no related allowance recorded	5,688		5,688		6,632
Recorded Investment - With an allowance recorded	5,263		5,263		3,986
Unpaid Principal Balance - With no related allowance recorded	5,780		5,780		7,147
Unpaid Principal Balance - With an allowance recorded	7,278		7,278		5,307
Related Allowance	2,383		2,383		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	1,690	2,216	1,741	2,518
Average Recorded Investment - With an allowance recorded	2,371	3,245	2,340	3,169
Interest Income Recognized - With no related allowance recorded	18	25	36	50
Interest Income Recognized - With an allowance recorded	4	28	30	52
Recorded Investment - With no related allowance recorded	1,548		1,548		1,843
Recorded Investment - With an allowance recorded	2,474		2,474		2,278
Unpaid Principal Balance - With no related allowance recorded	1,638		1,638		1,950
Unpaid Principal Balance - With an allowance recorded	2,506		2,506		2,293
Related Allowance	357		357		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	3,966	3,917	4,111	3,932
Average Recorded Investment - With an allowance recorded	1,230	897	1,236	905
Interest Income Recognized - With no related allowance recorded	47	55	94	110
Interest Income Recognized - With an allowance recorded		4	20	8
Recorded Investment - With no related allowance recorded	3,893		3,893		4,401
Recorded Investment - With an allowance recorded	1,226		1,226		1,248
Unpaid Principal Balance - With no related allowance recorded	3,893		3,893		4,402
Unpaid Principal Balance - With an allowance recorded	1,424		1,424		1,442
Related Allowance	318		318		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		51		52
Average Recorded Investment - With an allowance recorded	997	189	790	126
Interest Income Recognized - With no related allowance recorded		1		2
Interest Income Recognized - With an allowance recorded	30		30
Recorded Investment - With no related allowance recorded					183
Recorded Investment - With an allowance recorded	1,481		1,481		377
Unpaid Principal Balance - With no related allowance recorded					589
Unpaid Principal Balance - With an allowance recorded	3,266		3,266		1,489
Related Allowance	1,705		1,705		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	255	336	61	291
Average Recorded Investment - With an allowance recorded	83	84	83	84
Interest Income Recognized - With no related allowance recorded	3	3		6
Interest Income Recognized - With an allowance recorded		1	1	3
Recorded Investment - With no related allowance recorded	247		247		205
Recorded Investment - With an allowance recorded	82		82		83
Unpaid Principal Balance - With no related allowance recorded	249		249		206
Unpaid Principal Balance - With an allowance recorded	82		82		83
Related Allowance	3		3		4
Acquired loans recorded at fair value [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded			218	7
Interest Income Recognized - With no related allowance recorded			6
Acquired loans with deteriorated credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	2,431	7,264	3,235	7,679
Average Recorded Investment - With an allowance recorded	520	447	521	420
Interest Income Recognized - With no related allowance recorded	23	21	46	43
Interest Income Recognized - With an allowance recorded		7	7	12
Recorded Investment - With no related allowance recorded	2,420		2,420		4,844
Recorded Investment - With an allowance recorded	519		519		524
Unpaid Principal Balance - With no related allowance recorded	8,228		8,228		10,648
Unpaid Principal Balance - With an allowance recorded	566		566		571
Related Allowance	3		3		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	815	929	819	960
Average Recorded Investment - With an allowance recorded	520	447	521	420
Interest Income Recognized - With no related allowance recorded	14	14	28	30
Interest Income Recognized - With an allowance recorded		7	7	12
Recorded Investment - With no related allowance recorded	810		810		827
Recorded Investment - With an allowance recorded	519		519		524
Unpaid Principal Balance - With no related allowance recorded	1,366		1,366		1,383
Unpaid Principal Balance - With an allowance recorded	566		566		571
Related Allowance	3		3		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	718	5,461	1,516	5,850
Interest Income Recognized - With no related allowance recorded	7	7	14	13
Recorded Investment - With no related allowance recorded	715		715		3,113
Unpaid Principal Balance - With no related allowance recorded	1,769		1,769		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	829	865	823
Interest Income Recognized - With no related allowance recorded	2		4
Recorded Investment - With no related allowance recorded	862		862		867
Unpaid Principal Balance - With no related allowance recorded	5,048		5,048		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	34	$ 45	35	$ 46
Recorded Investment - With no related allowance recorded	33		33		37
Unpaid Principal Balance - With no related allowance recorded	$ 45		$ 45		$ 47

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