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Loans Receivable and Allowance for Loan Losses (Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	$ 17,839	$ 32,010
Average Recorded Investment - With an allowance recorded	7,132	8,523
Interest Income Recognized - With no related allowance recorded	203	316
Interest Income Recognized - With an allowance recorded	68	89
Recorded Investment - With no related allowance recorded	16,026		$ 19,647
Recorded Investment - With an allowance recorded	6,996		7,265
Recorded Investment - Total	23,022		26,912
Unpaid Principal Balance - With no related allowance recorded	24,201		29,082
Unpaid Principal Balance - With an allowance recorded	10,233		10,270
Unpaid Principal Balance - Total	34,434		39,352
Related Allowance	3,232		3,264
Originated loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	7,843	17,115
Average Recorded Investment - With an allowance recorded	2,567	4,015
Interest Income Recognized - With no related allowance recorded	112	210
Interest Income Recognized - With an allowance recorded	14	54
Recorded Investment - With no related allowance recorded	7,514		8,171
Recorded Investment - With an allowance recorded	2,379		2,755
Unpaid Principal Balance - With no related allowance recorded	9,770		11,287
Unpaid Principal Balance - With an allowance recorded	3,836		4,392
Related Allowance	1,028		1,097
Originated loans [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	1,995	3,073
Average Recorded Investment - With an allowance recorded	945	2,941
Interest Income Recognized - With no related allowance recorded	20	28
Interest Income Recognized - With an allowance recorded	8	25
Recorded Investment - With no related allowance recorded	1,980		2,010
Recorded Investment - With an allowance recorded	916		973
Unpaid Principal Balance - With no related allowance recorded	2,080		2,098
Unpaid Principal Balance - With an allowance recorded	917		973
Related Allowance	36		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	4,185	12,221
Average Recorded Investment - With an allowance recorded		56
Interest Income Recognized - With no related allowance recorded	45	134
Recorded Investment - With no related allowance recorded	3,901		4,469
Unpaid Principal Balance - With no related allowance recorded	3,945		4,527
Originated loans [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	1,055	1,063
Average Recorded Investment - With an allowance recorded	1,245	865
Interest Income Recognized - With no related allowance recorded	41	42
Interest Income Recognized - With an allowance recorded	3	27
Recorded Investment - With no related allowance recorded	1,001		1,108
Recorded Investment - With an allowance recorded	1,088		1,403
Unpaid Principal Balance - With no related allowance recorded	3,101		4,069
Unpaid Principal Balance - With an allowance recorded	2,539		3,037
Related Allowance	974		1,029
Originated loans [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	608	758
Average Recorded Investment - With an allowance recorded	377	153
Interest Income Recognized - With no related allowance recorded	6	6
Interest Income Recognized - With an allowance recorded	3	2
Recorded Investment - With no related allowance recorded	632		584
Recorded Investment - With an allowance recorded	375		379
Unpaid Principal Balance - With no related allowance recorded	644		593
Unpaid Principal Balance - With an allowance recorded	380		382
Related Allowance	18		20
Acquired loans recorded at fair value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	6,354	6,993
Average Recorded Investment - With an allowance recorded	4,042	4,142
Interest Income Recognized - With no related allowance recorded	68	84
Interest Income Recognized - With an allowance recorded	47	30
Recorded Investment - With no related allowance recorded	6,073		6,632
Recorded Investment - With an allowance recorded	4,096		3,986
Unpaid Principal Balance - With no related allowance recorded	6,185		7,147
Unpaid Principal Balance - With an allowance recorded	5,828		5,307
Related Allowance	2,199		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	1,838	2,753
Average Recorded Investment - With an allowance recorded	2,273	3,146
Interest Income Recognized - With no related allowance recorded	18	25
Interest Income Recognized - With an allowance recorded	26	24
Recorded Investment - With no related allowance recorded	1,832		1,843
Recorded Investment - With an allowance recorded	2,267		2,278
Unpaid Principal Balance - With no related allowance recorded	1,939		1,950
Unpaid Principal Balance - With an allowance recorded	2,284		2,293
Related Allowance	313		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	4,220	3,946
Average Recorded Investment - With an allowance recorded	1,241	912
Interest Income Recognized - With no related allowance recorded	47	55
Interest Income Recognized - With an allowance recorded	20	4
Recorded Investment - With no related allowance recorded	4,039		4,401
Recorded Investment - With an allowance recorded	1,234		1,248
Unpaid Principal Balance - With no related allowance recorded	4,043		4,402
Unpaid Principal Balance - With an allowance recorded	1,431		1,442
Related Allowance	332		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	92	53
Average Recorded Investment - With an allowance recorded	445
Interest Income Recognized - With no related allowance recorded		1
Recorded Investment - With no related allowance recorded			183
Recorded Investment - With an allowance recorded	512		377
Unpaid Principal Balance - With no related allowance recorded			589
Unpaid Principal Balance - With an allowance recorded	2,030		1,489
Related Allowance	1,550		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	204	230
Average Recorded Investment - With an allowance recorded	83	84
Interest Income Recognized - With no related allowance recorded	3	3
Interest Income Recognized - With an allowance recorded	1	2
Recorded Investment - With no related allowance recorded	202		205
Recorded Investment - With an allowance recorded	83		83
Unpaid Principal Balance - With no related allowance recorded	203		206
Unpaid Principal Balance - With an allowance recorded	83		83
Related Allowance	4		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		11
Acquired loans with deteriorated credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment - With no related allowance recorded	3,642	7,902
Average Recorded Investment - With an allowance recorded	523	366
Interest Income Recognized - With no related allowance recorded	23	22
Interest Income Recognized - With an allowance recorded	7	5
Recorded Investment - With no related allowance recorded	2,439		4,844
Recorded Investment - With an allowance recorded	521		524
Unpaid Principal Balance - With no related allowance recorded	8,246		10,648
Unpaid Principal Balance - With an allowance recorded	569		571
Related Allowance	5		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	823	1,019
Average Recorded Investment - With an allowance recorded	523	366
Interest Income Recognized - With no related allowance recorded	14	16
Interest Income Recognized - With an allowance recorded	7	5
Recorded Investment - With no related allowance recorded	819		827
Recorded Investment - With an allowance recorded	521		524
Unpaid Principal Balance - With no related allowance recorded	1,375		1,383
Unpaid Principal Balance - With an allowance recorded	569		571
Related Allowance	5		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	1,917	6,050
Interest Income Recognized - With no related allowance recorded	7	6
Recorded Investment - With no related allowance recorded	721		3,113
Unpaid Principal Balance - With no related allowance recorded	1,776		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	866	785
Interest Income Recognized - With no related allowance recorded	2
Recorded Investment - With no related allowance recorded	865		867
Unpaid Principal Balance - With no related allowance recorded	5,050		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	36	$ 48
Recorded Investment - With no related allowance recorded	34		37
Unpaid Principal Balance - With no related allowance recorded	$ 45		$ 47

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