Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Unearned Shares Held by ESOP [Member]	Unearned Shares Held by Compensation Plans [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Total
Beginning Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018						$ (10,000)			$ (10,000)
Beginning Balance at Dec. 31, 2018	$ 68,000	$ 30,916,000	$ (8,805,000)	$ (1,449,000)	$ (200,000)		$ 59,145,000	$ 129,000		$ 79,804,000
Net income							898,000			898,000
Other comprehensive income (loss), net of tax expense								628,000		628,000
ESOP shares earned		10,000		21,000						31,000
Stock based compensation		11,000								11,000
Compensation plan shares granted			49,000		(49,000)
Compensation plan shares earned		18,000			60,000					78,000
Purchase of treasury stock, at cost			(111,000)							(111,000)
Cash dividends declared							(267,000)			(267,000)
Ending Balance at Mar. 31, 2019	68,000	30,955,000	(8,867,000)	(1,428,000)	(189,000)		59,766,000	757,000		81,062,000
Beginning Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018						$ (10,000)			$ (10,000)
Beginning Balance at Dec. 31, 2018	68,000	30,916,000	(8,805,000)	(1,449,000)	(200,000)		59,145,000	129,000		79,804,000
Net income										2,915,000
Other comprehensive income (loss), net of tax expense										1,440,000
Ending Balance at Sep. 30, 2019	68,000	31,042,000	(9,802,000)	(1,385,000)	(71,000)		61,038,000	1,569,000		82,459,000
Beginning Balance at Mar. 31, 2019	68,000	30,955,000	(8,867,000)	(1,428,000)	(189,000)		59,766,000	757,000		81,062,000
Net income							805,000			805,000
Other comprehensive income (loss), net of tax expense								615,000		615,000
ESOP shares earned		6,000		21,000						27,000
Stock based compensation		11,000								11,000
Compensation plan shares forfeited			(8,000)		8,000
Compensation plan shares earned		23,000			58,000					81,000
Purchase of treasury stock, at cost			(672,000)							(672,000)
Cash dividends declared							(265,000)			(265,000)
Ending Balance at Jun. 30, 2019	68,000	30,995,000	(9,547,000)	(1,407,000)	(123,000)		60,306,000	1,372,000		81,664,000
Net income							1,212,000			1,212,000
Other comprehensive income (loss), net of tax expense								197,000		197,000
Stock options exercised		6,000								6,000
ESOP shares earned		11,000		22,000						33,000
Stock based compensation		11,000								11,000
Compensation plan shares earned		19,000			52,000					71,000
Purchase of treasury stock, at cost			(255,000)							(255,000)
Cash dividends declared							(480,000)			(480,000)
Ending Balance at Sep. 30, 2019	68,000	31,042,000	(9,802,000)	(1,385,000)	(71,000)		61,038,000	1,569,000		82,459,000
Beginning Balance at Dec. 31, 2019	68,000	31,078,000	(10,184,000)	(1,364,000)	(39,000)		61,950,000	1,331,000		82,840,000
Net income							731,000			731,000
Other comprehensive income (loss), net of tax expense								828,000		828,000
ESOP shares earned		7,000		21,000						28,000
Stock based compensation		11,000								11,000
Compensation plan shares granted			196,000		(196,000)
Compensation plan shares earned		9,000			20,000					29,000
Purchase of treasury stock, at cost			(377,000)							(377,000)
Cash dividends declared							(259,000)			(259,000)
Ending Balance at Mar. 31, 2020	68,000	31,105,000	(10,365,000)	(1,343,000)	(215,000)		62,422,000	2,159,000		83,831,000
Beginning Balance at Dec. 31, 2019	68,000	31,078,000	(10,184,000)	(1,364,000)	(39,000)		61,950,000	1,331,000		82,840,000
Net income										3,315,000
Other comprehensive income (loss), net of tax expense										695,000
Ending Balance at Sep. 30, 2020	68,000	31,169,000	(11,430,000)	(1,300,000)	(147,000)		64,501,000	2,026,000		84,887,000
Beginning Balance at Mar. 31, 2020	68,000	31,105,000	(10,365,000)	(1,343,000)	(215,000)		62,422,000	2,159,000		83,831,000
Net income							1,353,000			1,353,000
Other comprehensive income (loss), net of tax expense								5,000		5,000
ESOP shares earned		2,000		21,000						23,000
Stock based compensation		11,000								11,000
Compensation plan shares forfeited			(4,000)		4,000
Compensation plan shares earned		19,000			31,000					50,000
Purchase of treasury stock, at cost			(511,000)							(511,000)
Cash dividends declared							(254,000)			(254,000)
Ending Balance at Jun. 30, 2020	68,000	31,137,000	(10,880,000)	(1,322,000)	(180,000)		63,521,000	2,164,000		84,508,000
Net income							1,231,000			1,231,000
Other comprehensive income (loss), net of tax expense								(138,000)		(138,000)
ESOP shares earned		3,000		22,000						25,000
Stock based compensation		11,000								11,000
Compensation plan shares earned		18,000			33,000					51,000
Purchase of treasury stock, at cost			(550,000)							(550,000)
Cash dividends declared							(251,000)			(251,000)
Ending Balance at Sep. 30, 2020	$ 68,000	$ 31,169,000	$ (11,430,000)	$ (1,300,000)	$ (147,000)		$ 64,501,000	$ 2,026,000		$ 84,887,000