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Loans Receivable and Allowance for Loan Losses (Allowance for Loan Losses) (Details) - USD ($)	3 Months Ended			12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	$ 23,734,000		$ 22,359,000	$ 22,359,000
Allowance for loan losses: Charge-offs	4,000		256,000	743,000
Allowance for loan losses: Recoveries	304,000		12,000	49,000
Allowance for loan losses: Provisions	1,500,000	$ 475,000	889,000	2,069,000
Allowance for loan losses: Ending Balance	25,534,000	23,734,000	23,004,000	23,734,000
Allowance for loan losses: Ending balance: individually evaluated for impairment	3,232,000	3,264,000		3,264,000
Allowance for loan losses: Ending balance: collectively evaluated for impairment	22,302,000	20,470,000		20,470,000
Loans receivables: Ending balance	2,190,677,000	2,203,315,000		2,203,315,000
Loans receivables: Ending balance: individually evaluated for impairment	23,022,000	26,912,000		26,912,000
Loans receivables: Ending balance: collectively evaluated for impairment	2,167,655,000	2,176,403,000		2,176,403,000
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	2,722,000		2,748,000	2,748,000
Allowance for loan losses: Charge-offs	4,000			66,000
Allowance for loan losses: Recoveries				3,000
Allowance for loan losses: Provisions	413,000		159,000	37,000
Allowance for loan losses: Ending Balance	3,131,000	2,722,000	2,907,000	2,722,000
Allowance for loan losses: Ending balance: individually evaluated for impairment	354,000	380,000		380,000
Allowance for loan losses: Ending balance: collectively evaluated for impairment	2,777,000	2,342,000		2,342,000
Loans receivables: Ending balance	268,137,000	248,381,000		248,381,000
Loans receivables: Ending balance: individually evaluated for impairment	8,335,000	8,455,000		8,455,000
Loans receivables: Ending balance: collectively evaluated for impairment	259,802,000	239,926,000		239,926,000
Commercial and Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	15,372,000		14,168,000	14,168,000
Allowance for loan losses: Charge-offs			111,000	229,000
Allowance for loan losses: Recoveries				10,000
Allowance for loan losses: Provisions	(423,000)		1,164,000	1,423,000
Allowance for loan losses: Ending Balance	14,949,000	15,372,000	15,221,000	15,372,000
Allowance for loan losses: Ending balance: individually evaluated for impairment	332,000	342,000		342,000
Allowance for loan losses: Ending balance: collectively evaluated for impairment	14,617,000	15,030,000		15,030,000
Loans receivables: Ending balance	1,577,816,000	1,606,976,000		1,606,976,000
Loans receivables: Ending balance: individually evaluated for impairment	9,895,000	13,231,000		13,231,000
Loans receivables: Ending balance: collectively evaluated for impairment	1,567,921,000	1,593,745,000		1,593,745,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	1,244,000		1,003,000	1,003,000
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions	(139,000)		206,000	241,000
Allowance for loan losses: Ending Balance	1,105,000	1,244,000	1,209,000	1,244,000
Allowance for loan losses: Ending balance: individually evaluated for impairment
Allowance for loan losses: Ending balance: collectively evaluated for impairment	1,105,000	1,244,000		1,244,000
Loans receivables: Ending balance	101,692,000	104,996,000		104,996,000
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment	101,692,000	104,996,000		104,996,000
Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	3,790,000		3,933,000	3,933,000
Allowance for loan losses: Charge-offs			145,000	448,000
Allowance for loan losses: Recoveries	302,000		9,000	20,000
Allowance for loan losses: Provisions	(135,000)		(430,000)	285,000
Allowance for loan losses: Ending Balance	3,957,000	3,790,000	3,367,000	3,790,000
Allowance for loan losses: Ending balance: individually evaluated for impairment	2,524,000	2,518,000		2,518,000
Allowance for loan losses: Ending balance: collectively evaluated for impairment	1,433,000	1,272,000		1,272,000
Loans receivables: Ending balance	177,146,000	177,642,000		177,642,000
Loans receivables: Ending balance: individually evaluated for impairment	3,466,000	3,938,000		3,938,000
Loans receivables: Ending balance: collectively evaluated for impairment	173,680,000	173,704,000		173,704,000
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	333,000		316,000	316,000
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries	2,000		3,000	16,000
Allowance for loan losses: Provisions	290,000		(51,000)	1,000
Allowance for loan losses: Ending Balance	625,000	333,000	268,000	333,000
Allowance for loan losses: Ending balance: individually evaluated for impairment	22,000	24,000		24,000
Allowance for loan losses: Ending balance: collectively evaluated for impairment	603,000	309,000		309,000
Loans receivables: Ending balance	64,857,000	64,638,000		64,638,000
Loans receivables: Ending balance: individually evaluated for impairment	1,326,000	1,288,000		1,288,000
Loans receivables: Ending balance: collectively evaluated for impairment	63,531,000	63,350,000		63,350,000
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance			2,000	2,000
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions	5,000		(2,000)	(2,000)
Allowance for loan losses: Ending Balance	5,000
Allowance for loan losses: Ending balance: individually evaluated for impairment
Allowance for loan losses: Ending balance: collectively evaluated for impairment	5,000
Loans receivables: Ending balance	1,029,000	682,000		682,000
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment	1,029,000	682,000		682,000
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	273,000		189,000	189,000
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions	1,489,000		(157,000)	84,000
Allowance for loan losses: Ending Balance	1,762,000	273,000	32,000	273,000
Allowance for loan losses: Ending balance: individually evaluated for impairment
Allowance for loan losses: Ending balance: collectively evaluated for impairment	1,762,000	273,000		273,000
Loans receivables: Ending balance
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment
Originated loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	22,449,000		21,750,000	21,750,000
Allowance for loan losses: Charge-offs			256,000	257,000
Allowance for loan losses: Recoveries	302,000		9,000	15,000
Allowance for loan losses: Provisions	1,400,000		879,000	941,000
Allowance for loan losses: Ending Balance	24,151,000	22,449,000	22,382,000	22,449,000
Loans receivables: Ending balance	2,007,469,000	2,010,489,000		2,010,489,000
Loans receivables: Ending balance: individually evaluated for impairment	9,893,000	10,926,000		10,926,000
Loans receivables: Ending balance: collectively evaluated for impairment	1,997,576,000	1,999,563,000		1,999,563,000
Originated loans [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	2,422,000		2,374,000	2,374,000
Allowance for loan losses: Charge-offs				1,000
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions	365,000		97,000	49,000
Allowance for loan losses: Ending Balance	2,787,000	2,422,000	2,471,000	2,422,000
Loans receivables: Ending balance	232,892,000	212,020,000		212,020,000
Loans receivables: Ending balance: individually evaluated for impairment	2,896,000	2,983,000		2,983,000
Loans receivables: Ending balance: collectively evaluated for impairment	229,996,000	209,037,000		209,037,000
Originated loans [Member] | Commercial and Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	15,235,000		14,000,000	14,000,000
Allowance for loan losses: Charge-offs			111,000	111,000
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions	(368,000)		1,188,000	1,346,000
Allowance for loan losses: Ending Balance	14,867,000	15,235,000	15,077,000	15,235,000
Loans receivables: Ending balance	1,463,122,000	1,485,286,000		1,485,286,000
Loans receivables: Ending balance: individually evaluated for impairment	3,901,000	4,469,000		4,469,000
Loans receivables: Ending balance: collectively evaluated for impairment	1,459,221,000	1,480,817,000		1,480,817,000
Originated loans [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	1,244,000		1,003,000	1,003,000
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions	(139,000)		206,000	241,000
Allowance for loan losses: Ending Balance	1,105,000	1,244,000	1,209,000	1,244,000
Loans receivables: Ending balance	101,692,000	104,996,000		104,996,000
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment	101,692,000	104,996,000		104,996,000
Originated loans [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	2,945,000		3,869,000	3,869,000
Allowance for loan losses: Charge-offs			145,000	145,000
Allowance for loan losses: Recoveries	302,000		9,000	15,000
Allowance for loan losses: Provisions	(243,000)		(405,000)	(794,000)
Allowance for loan losses: Ending Balance	3,004,000	2,945,000	3,328,000	2,945,000
Loans receivables: Ending balance	157,351,000	157,413,000		157,413,000
Loans receivables: Ending balance: individually evaluated for impairment	2,089,000	2,511,000		2,511,000
Loans receivables: Ending balance: collectively evaluated for impairment	155,262,000	154,902,000		154,902,000
Originated loans [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	330,000		313,000	313,000
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions	291,000		(48,000)	17,000
Allowance for loan losses: Ending Balance	621,000	330,000	265,000	330,000
Loans receivables: Ending balance	51,393,000	50,100,000		50,100,000
Loans receivables: Ending balance: individually evaluated for impairment	1,007,000	963,000		963,000
Loans receivables: Ending balance: collectively evaluated for impairment	50,386,000	49,137,000		49,137,000
Originated loans [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance			2,000	2,000
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions	5,000		(2,000)	(2,000)
Allowance for loan losses: Ending Balance	5,000
Loans receivables: Ending balance	1,019,000	674,000		674,000
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment	1,019,000	674,000		674,000
Originated loans [Member] | Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	273,000		189,000	189,000
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions	1,489,000		(157,000)	84,000
Allowance for loan losses: Ending Balance	1,762,000	273,000	32,000	273,000
Loans receivables: Ending balance
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment
Acquired loans recorded at fair value [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	1,122,000		335,000	335,000
Allowance for loan losses: Charge-offs	4,000			486,000
Allowance for loan losses: Recoveries	2,000		3,000	34,000
Allowance for loan losses: Provisions	159,000		66,000	1,239,000
Allowance for loan losses: Ending Balance	1,279,000	1,122,000	404,000	1,122,000
Loans receivables: Ending balance	180,006,000	187,216,000		187,216,000
Loans receivables: Ending balance: individually evaluated for impairment	10,169,000	10,618,000		10,618,000
Loans receivables: Ending balance: collectively evaluated for impairment	169,837,000	176,598,000		176,598,000
Acquired loans recorded at fair value [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	261,000		335,000	335,000
Allowance for loan losses: Charge-offs	4,000			65,000
Allowance for loan losses: Recoveries				3,000
Allowance for loan losses: Provisions	49,000		69,000	(12,000)
Allowance for loan losses: Ending Balance	306,000	261,000	404,000	261,000
Loans receivables: Ending balance	33,905,000	35,010,000		35,010,000
Loans receivables: Ending balance: individually evaluated for impairment	4,099,000	4,121,000		4,121,000
Loans receivables: Ending balance: collectively evaluated for impairment	29,806,000	30,889,000		30,889,000
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	58,000
Allowance for loan losses: Charge-offs				118,000
Allowance for loan losses: Recoveries				10,000
Allowance for loan losses: Provisions	5,000			166,000
Allowance for loan losses: Ending Balance	63,000	58,000		58,000
Loans receivables: Ending balance	113,973,000	118,577,000		118,577,000
Loans receivables: Ending balance: individually evaluated for impairment	5,273,000	5,649,000		5,649,000
Loans receivables: Ending balance: collectively evaluated for impairment	108,700,000	112,928,000		112,928,000
Acquired loans recorded at fair value [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions
Allowance for loan losses: Ending Balance
Loans receivables: Ending balance
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment
Acquired loans recorded at fair value [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	803,000
Allowance for loan losses: Charge-offs				303,000
Allowance for loan losses: Recoveries				5,000
Allowance for loan losses: Provisions	107,000			1,101,000
Allowance for loan losses: Ending Balance	910,000	803,000		803,000
Loans receivables: Ending balance	18,888,000	19,319,000		19,319,000
Loans receivables: Ending balance: individually evaluated for impairment	512,000	560,000		560,000
Loans receivables: Ending balance: collectively evaluated for impairment	18,376,000	18,759,000		18,759,000
Acquired loans recorded at fair value [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries	2,000		3,000	16,000
Allowance for loan losses: Provisions	(2,000)		(3,000)	(16,000)
Allowance for loan losses: Ending Balance
Loans receivables: Ending balance	13,230,000	14,302,000		14,302,000
Loans receivables: Ending balance: individually evaluated for impairment	285,000	288,000		288,000
Loans receivables: Ending balance: collectively evaluated for impairment	12,945,000	14,014,000		14,014,000
Acquired loans recorded at fair value [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions
Allowance for loan losses: Ending Balance
Loans receivables: Ending balance	10,000	8,000		8,000
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment	10,000	8,000		8,000
Acquired loans recorded at fair value [Member] | Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance
Allowance for loan losses: Charge-offs
Allowance for loan losses: Recoveries
Allowance for loan losses: Provisions
Allowance for loan losses: Ending Balance
Loans receivables: Ending balance
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment
Acquired loans with deteriorated credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	163,000		274,000	274,000
Allowance for loan losses: Provisions	(59,000)		(56,000)	(111,000)
Allowance for loan losses: Ending Balance	104,000	163,000	218,000	163,000
Loans receivables: Ending balance	3,202,000	5,610,000		5,610,000
Loans receivables: Ending balance: individually evaluated for impairment	2,960,000	5,368,000		5,368,000
Loans receivables: Ending balance: collectively evaluated for impairment	242,000	242,000		242,000
Acquired loans with deteriorated credit [Member] | Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	39,000		39,000	39,000
Allowance for loan losses: Provisions	(1,000)		(7,000)
Allowance for loan losses: Ending Balance	38,000	39,000	32,000	39,000
Loans receivables: Ending balance	1,340,000	1,351,000		1,351,000
Loans receivables: Ending balance: individually evaluated for impairment	1,340,000	1,351,000		1,351,000
Loans receivables: Ending balance: collectively evaluated for impairment
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	79,000		168,000	168,000
Allowance for loan losses: Provisions	(60,000)		(24,000)	(89,000)
Allowance for loan losses: Ending Balance	19,000	79,000	144,000	79,000
Loans receivables: Ending balance	721,000	3,113,000		3,113,000
Loans receivables: Ending balance: individually evaluated for impairment	721,000	3,113,000		3,113,000
Loans receivables: Ending balance: collectively evaluated for impairment
Acquired loans with deteriorated credit [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance
Allowance for loan losses: Provisions
Allowance for loan losses: Ending Balance
Loans receivables: Ending balance
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment
Acquired loans with deteriorated credit [Member] | Commercial Business [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	42,000		64,000	64,000
Allowance for loan losses: Provisions	1,000		(25,000)	(22,000)
Allowance for loan losses: Ending Balance	43,000	42,000	39,000	42,000
Loans receivables: Ending balance	907,000	910,000		910,000
Loans receivables: Ending balance: individually evaluated for impairment	865,000	867,000		867,000
Loans receivables: Ending balance: collectively evaluated for impairment	42,000	43,000		43,000
Acquired loans with deteriorated credit [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance	3,000		3,000	3,000
Allowance for loan losses: Provisions	1,000
Allowance for loan losses: Ending Balance	4,000	3,000	$ 3,000	3,000
Loans receivables: Ending balance	234,000	236,000		236,000
Loans receivables: Ending balance: individually evaluated for impairment	34,000	37,000		37,000
Loans receivables: Ending balance: collectively evaluated for impairment	200,000	199,000		199,000
Acquired loans with deteriorated credit [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance
Allowance for loan losses: Provisions
Allowance for loan losses: Ending Balance
Loans receivables: Ending balance
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment
Acquired loans with deteriorated credit [Member] | Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses: Beginning Balance
Allowance for loan losses: Provisions
Allowance for loan losses: Ending Balance
Loans receivables: Ending balance
Loans receivables: Ending balance: individually evaluated for impairment
Loans receivables: Ending balance: collectively evaluated for impairment

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No definition available.

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-Publisher FASB
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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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