Supplemental Comprehensive Income Disclosures (Tables)

12 Months Ended

Dec. 31, 2020

Supplemental Comprehensive Income Disclosures [Abstract]

Schedule of Amounts Recognized in Accumulated Other Comprehensive Income

The following table identifies the related tax effects allocated to each component of other comprehensive income in the Consolidated Statements of Comprehensive Income as of December 31. Reclassification adjustments related to securities available for sale are included in the “Net securities gains” line in the Consolidated Statements of Income and reclassification adjustments related to losses on derivatives are included in the "Other operating expenses" line in the Consolidated Statements of Income.

	2020						2019						2018
	Pretax Amount		Tax (Expense) Benefit		Net of Tax Amount		Pretax Amount		Tax (Expense) Benefit		Net of Tax Amount		Pretax Amount		Tax (Expense) Benefit		Net of Tax Amount
	(dollars in thousands)
Unrealized gains (losses) on securities:
Unrealized holding gains on securities arising during the period	$	19,981	$	(4,196)	$	15,785	$	20,625	$	(4,331)	$	16,294	$	2,783	$	(585)	$	2,198
Reclassification adjustment for gains on securities included in net income	(70)		15		(55)		(22)		5		(17)		(8,102)		1,701		(6,401)
Total unrealized gains (losses) on securities	19,911		(4,181)		15,730		20,603		(4,326)		16,277		(5,319)		1,116		(4,203)
Unrealized gains (losses) on derivatives:
Unrealized holding (losses) gains on derivatives arising during the period	(4,467)		938		(3,529)		935		(196)		739		326		(68)		258
Reclassification adjustment for losses on derivatives included in net income	—		—		—		—		—		—		10		(3)		7
Total unrealized (losses) gains on derivatives	(4,467)		938		(3,529)		935		(196)		739		336		(71)		265
Unrealized (losses) gains for postretirement obligations:
Prior service cost	(537)		113		(424)		—		—		—		—		—		—
Net (loss) gain	(155)		32		(123)		(121)		25		(96)		144		(30)		114
Total unrealized (losses) gains for postretirement obligations	(692)		145		(547)		(121)		25		(96)		144		(30)		114
Total other comprehensive income (loss)	$	14,752	$	(3,098)	$	11,654	$	21,417	$	(4,497)	$	16,920	$	(4,839)	$	1,015	$	(3,824)

The following table sets forth the amounts recognized in accumulated other comprehensive income that have not yet been recognized as components of net periodic benefit costs as of December 31:

	2020		2019		2018
	(dollars in thousands)
Amounts recognized in accumulated other comprehensive income, net of tax:
Net (gain) loss	$	(243)	$	(366)	$	(461)
Prior service cost	424		—		—
Total	$	181	$	(366)	$	(461)

Related Tax Effects Allocated to Each Component of Other Comprehensive Income

The following table details the change in components of OCI for the year-ended December 31:

	2020
	Securities Available for Sale		Derivatives		Post-Retirement Obligation		Accumulated Other Comprehensive Income
	(dollars in thousands)
Balance at December 31	$	4,580	$	634	$	365	$	5,579
Other comprehensive income before reclassification adjustment	15,785		(3,529)				12,256
Amounts reclassified from accumulated other comprehensive income (loss)	(55)		—				(55)
Prior service cost					(424)		(424)
Net gain					(123)		(123)
Net other comprehensive income during the period	15,730		(3,529)		(547)		11,654
Balance at December 31	$	20,310	$	(2,895)	$	(182)	$	17,233
	2019
	Securities Available for Sale		Derivatives		Post-Retirement Obligation		Accumulated Other Comprehensive Income
	(dollars in thousands)
Balance at January 1	$	(11,697)	$	(105)	$	461	$	(11,341)
Other comprehensive income before reclassification adjustment	16,294		739				17,033
Amounts reclassified from accumulated other comprehensive income (loss)	(17)		—				(17)
Net gain					(96)		(96)
Net other comprehensive income during the period	16,277		739		(96)		16,920
Balance at December 31	$	4,580	$	634	$	365	$	5,579
	2018
	Securities Available for Sale		Derivatives		Post-Retirement Obligation		Accumulated Other Comprehensive Income
	(dollars in thousands)
Balance at January 1	$	(6,166)	$	(306)	$	299	$	(6,173)
Cumulative effect of adoption of ASU 2018-02	(1,328)		(64)		48		(1,344)
Balance at January 1	(7,494)		(370)		347		(7,517)
Other comprehensive income before reclassification adjustment	2,198		258				2,456
Amounts reclassified from accumulated other comprehensive income (loss)	(6,401)		7				(6,394)
Net gain					114		114
Net other comprehensive income during the period	(4,203)		265		114		(3,824)
Balance at December 31	$	(11,697)	$	(105)	$	461	$	(11,341)