Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2020

Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract]

Schedule of reclassification adjustments related to securities available for sale are included in gains on sale or call of securities

Reclassification adjustments related to the defined benefit postretirement medical plan are included in compensation and benefits in the accompanying consolidated condensed statements of income.

	Before Tax Amount			Tax Effect			Net of Tax Amount
	(In Thousands)
Twelve months ended December 31, 2020:
Securities available for sale and transferred securities:
Change in net unrealized gain/(loss) during the period	$	14,431		$	3,030		$	11,401
Reclassification adjustment for net gains included in net income		(1,464	)		(307	)		(1,157	)
Defined benefit postretirement medical plan:
Net gain on defined benefit postretirement medical plan realized    during the period		195			41			154
Reclassification adjustment for net amortization and deferral on defined    benefit postretirement medical plan (included in compensation and    benefits)		13			2			11
Total other comprehensive income	$	13,175		$	2,766		$	10,409

	Before Tax Amount			Tax Effect			Net of Tax Amount
	(In Thousands)
Twelve months ended December 31, 2019:
Securities available for sale and transferred securities:
Change in net unrealized gain/(loss) during the period	$	8,754		$	1,839		$	6,915
Reclassification adjustment for net gains included in net income		(24	)		(5	)		(19	)
Defined benefit postretirement medical plan:
Net gain on defined benefit postretirement medical plan realized    during the period		(310	)		(146	)		(164	)
Reclassification adjustment for net amortization and deferral on defined    benefit postretirement medical plan (included in compensation and    benefits)		14			3			11
Total other comprehensive income	$	8,434		$	1,691		$	6,743

	Before Tax Amount			Tax Effect			Net of Tax Amount
	(In Thousands)
Twelve months ended December 31, 2018
Securities available for sale and transferred securities:
Change in net unrealized gain/(loss) during the period	$	(3,356	)	$	(706	)	$	(2,650	)
Reclassification adjustment for net gains included in net income		(173	)		(36	)		(137	)
Defined benefit postretirement medical plan:
Net gain on defined benefit postretirement medical plan realized    during the period		560			200			360
Reclassification adjustment for net amortization and deferral on defined    benefit postretirement medical plan (included in compensation and    benefits)		18			3			15
Total other comprehensive income	$	(2,951	)	$	(539	)	$	(2,412	)

Schedule of accumulated other comprehensive income (loss), net of tax

Activity in accumulated other comprehensive income (loss), net of tax, was as follows:

	Securities Available For Sale			Post- retirement Benefit			Accumulated Other Comprehensive Income
	(In Thousands)
Balance January 1, 2020	$	4,839		$	(244	)	$	4,595
Other comprehensive income before reclassifications		11,401			154			11,555
Amounts reclassified from accumulated other comprehensive loss		(1,157	)		11			(1,146	)
Net other comprehensive income during period		10,244			165			10,409
Balance December 31, 2020	$	15,083		$	(79	)	$	15,004
Balance January 1, 2019	$	(2,057	)	$	(91	)	$	(2,148	)
Other comprehensive income before reclassifications		6,915			(164	)		6,751
Amounts reclassified from accumulated other comprehensive loss		(19	)		11			(8	)
Net other comprehensive income during period		6,896			(153	)		6,743
Balance December 31, 2019	$	4,839		$	(244	)	$	4,595
Balance January 1, 2018	$	601		$	(384	)	$	217
Other comprehensive income before reclassifications		(2,650	)		360			(2,290	)
Amounts reclassified from accumulated other comprehensive loss		(137	)		15			(122	)
Net other comprehensive income during period		(2,787	)		375			(2,412	)
Reclassification Adjustment upon adoption of ASU 2018-02		129			(82	)		47
Balance December 31, 2018	$	(2,057	)	$	(91	)	$	(2,148	)