Securities - Summary of Amortized Cost and Fair Value of Debt Securities Based on Remaining Period to Contractual Maturity (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Available for sale amortized cost
Within 1 year	$ 158.4
After 1 but within 5 years	616.0
After 5 but within 10 years	855.1
After 10 years	1,916.3
Amortized Cost	3,545.8	$ 3,185.6
Available for sale fair value
Within 1 year	158.4
After 1 but within 5 years	615.6
After 5 but within 10 years	867.7
After 10 years	1,922.6
Fair value	$ 3,564.3	3,121.0
Available for sale FTE yield
Within 1 year	1.84%
After 1 but within 5 years	1.67%
After 5 but within 10 years	2.67%
After 10 years	2.35%
Total	2.29%
Held-to-maturity amortized cost
Within 1 year	$ 19.5
After 1 but within 5 years	1,097.4
After 5 but within 10 years	625.4
After 10 years	2,126.9
Amortized Cost	3,869.2	3,792.3
Held-to-maturity fair value
Within 1 year	19.6
After 1 but within 5 years	1,112.9
After 5 but within 10 years	653.3
After 10 years	2,234.2
Fair value	$ 4,020.0	3,775.9
Held-to-maturity FTE yield
Within 1 year	2.74%
After 1 but within 5 years	2.51%
After 5 but within 10 years	3.43%
After 10 years	3.59%
Total	3.25%
U.S. Treasury and Agency [Member]
Available for sale amortized cost
Within 1 year	$ 158.4
After 1 but within 5 years	531.1
Amortized Cost	689.5	699.0
Available for sale fair value
Within 1 year	158.4
After 1 but within 5 years	528.7
Fair value	$ 687.1	678.0
Available for sale FTE yield
Within 1 year	1.84%
After 1 but within 5 years	1.43%
Total	1.53%
Held-to-maturity amortized cost
Within 1 year	$ 0.0
After 1 but within 5 years	0.0
Amortized Cost	0.0
Held-to-maturity fair value
Within 1 year	0.0
After 1 but within 5 years	0.0
Fair value	$ 0.0
Held-to-maturity FTE yield
Within 1 year	0.00%
After 1 but within 5 years	0.00%
Total	0.00%
GSE Mortgage-Backed Securities [Member]
Available for sale amortized cost
Within 1 year	$ 0.0
After 1 but within 5 years	84.9
After 5 but within 10 years	855.1
After 10 years	1,916.3
Amortized Cost	2,856.3	2,486.6
Available for sale fair value
Within 1 year	0.0
After 1 but within 5 years	86.9
After 5 but within 10 years	867.7
After 10 years	1,922.6
Fair value	$ 2,877.2	2,443.0
Available for sale FTE yield
Within 1 year	0.00%
After 1 but within 5 years	3.17%
After 5 but within 10 years	2.67%
After 10 years	2.35%
Total	2.47%
Held-to-maturity amortized cost
Within 1 year	$ 2.7
After 1 but within 5 years	861.0
After 5 but within 10 years	120.2
After 10 years	287.5
Amortized Cost	1,271.4	1,367.5
Held-to-maturity fair value
Within 1 year	2.7
After 1 but within 5 years	866.6
After 5 but within 10 years	121.3
After 10 years	288.5
Fair value	$ 1,279.1	1,334.3
Held-to-maturity FTE yield
Within 1 year	2.04%
After 1 but within 5 years	2.43%
After 5 but within 10 years	2.52%
After 10 years	2.17%
Total	2.38%
State and Municipal [Member]
Available for sale amortized cost
Within 1 year	$ 0.0
After 1 but within 5 years	0.0
After 5 but within 10 years	0.0
After 10 years	0.0
Amortized Cost	0.0
Available for sale fair value
Within 1 year	0.0
After 1 but within 5 years	0.0
After 5 but within 10 years	0.0
After 10 years	0.0
Fair value	$ 0.0
Available for sale FTE yield
Within 1 year	0.00%
After 1 but within 5 years	0.00%
After 5 but within 10 years	0.00%
After 10 years	0.00%
Total	0.00%
Held-to-maturity amortized cost
Within 1 year	$ 10.3
After 1 but within 5 years	235.4
After 5 but within 10 years	418.8
After 10 years	1,839.4
Amortized Cost	2,503.9	2,352.4
Held-to-maturity fair value
Within 1 year	10.4
After 1 but within 5 years	245.3
After 5 but within 10 years	444.1
After 10 years	1,945.7
Fair value	$ 2,645.5	2,369.4
Held-to-maturity FTE yield
Within 1 year	2.61%
After 1 but within 5 years	2.78%
After 5 but within 10 years	3.47%
After 10 years	3.81%
Total	3.65%
Corporate [Member]
Available for sale amortized cost
Within 1 year	$ 0.0
After 1 but within 5 years	0.0
After 5 but within 10 years	0.0
Amortized Cost	0.0
Available for sale fair value
Within 1 year	0.0
After 1 but within 5 years	0.0
After 5 but within 10 years	0.0
Fair value	$ 0.0
Available for sale FTE yield
Within 1 year	0.00%
After 1 but within 5 years	0.00%
After 5 but within 10 years	0.00%
Total	0.00%
Held-to-maturity amortized cost
Within 1 year	$ 5.0
After 1 but within 5 years	1.0
After 5 but within 10 years	86.4
Amortized Cost	92.4	70.9
Held-to-maturity fair value
Within 1 year	5.0
After 1 but within 5 years	1.0
After 5 but within 10 years	87.9
Fair value	$ 93.9	70.7
Held-to-maturity FTE yield
Within 1 year	3.50%
After 1 but within 5 years	2.67%
After 5 but within 10 years	4.52%
Total	4.45%
Other [Member]
Available for sale amortized cost
Within 1 year	$ 0.0
Amortized Cost	0.0
Available for sale fair value
Within 1 year	0.0
Fair value	$ 0.0
Available for sale FTE yield
Within 1 year	0.00%
Total	0.00%
Held-to-maturity amortized cost
Within 1 year	$ 1.5
Amortized Cost	1.5	1.5
Held-to-maturity fair value
Within 1 year	1.5
Fair value	$ 1.5	$ 1.5
Held-to-maturity FTE yield
Within 1 year	2.46%
Total	2.46%

Fully taxable equivalent yield of available-for-sale debt securities.

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