Other Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Schedule of Comprehensive Income (Loss)

The gross amounts of each component of other comprehensive income and the related tax effects for the periods indicated are as follows:

Year Ended December 31, 2021	Before Tax Amount		Tax Expense (Benefit)		Net of Tax Amount
Investment securities available-for sale:
Change in net unrealized loss during period	$	(113.7)	$	(28.7)	$	(85.0)
Reclassification adjustment for net gains included in net income	(1.1)		(0.3)		(0.8)
Net change in unamortized gains on available-for-sale securities transferred into held-to-maturity	20.2		5.1		15.1
Change in net unrealized loss on derivatives	4.2		1.1		3.1
Total other comprehensive loss	$	(90.4)	$	(22.8)	$	(67.6)

Year Ended December 31, 2020	Before Tax Amount		Tax Expense (Benefit)		Net of Tax Amount
Investment securities available-for sale:
Change in net unrealized gains during period	$	61.8	$	15.8	$	46.0
Reclassification adjustment for net gains included in net income	(0.3)		(0.1)		(0.2)
Change in net unrealized loss on derivatives	0.2		—		0.2
Defined benefits post-retirement benefit plan:
Change in net actuarial gains	(0.5)		(0.1)		(0.4)
Total other comprehensive income	$	61.2	$	15.6	$	45.6

Year Ended December 31, 2019	Before Tax Amount		Tax Expense (Benefit)		Net of Tax Amount
Investment securities available-for sale:
Change in net unrealized gains during period	$	54.9	$	14.1	$	40.8
Reclassification adjustment for net gains included in net income	(0.1)		—		(0.1)
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale	(6.0)		(1.6)		(4.4)
Defined benefits post-retirement benefit plan:
Change in net actuarial gains	(0.8)		(0.1)		(0.7)
Total other comprehensive income	$	48.0	$	12.4	$	35.6

Schedule of Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income, net of income taxes, are as follows:

Years ended December 31,	2021		2020
Net unrealized (loss) gain on investment securities available-for-sale	$	(29.0)	$	56.8
Net unrealized gain on investment securities transferred to held-to-maturity	15.0		—
Net unrealized gain (loss) on derivatives	3.0		(0.2)
Net accumulated other comprehensive (loss) income	$	(11.0)	$	56.6