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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Approximate Fair Values of Investment Securities
The amortized cost and the approximate fair values of investment securities are summarized as follows:
March 31, 2022Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Available-for-Sale:
U.S. Treasury notes$698.2 $— $(53.3)$644.9 
State, county, and municipal securities320.3 0.2 (27.8)292.7 
Obligations of U.S. government agencies144.6 — (6.7)137.9 
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations3,816.4 1.1 (171.8)3,645.7 
Private mortgage-backed securities288.4 — (13.6)274.8 
Collateralized loan obligations1,075.4 — (4.5)1,070.9 
Corporate securities231.8 0.5 (15.4)216.9 
Total$6,575.1 $1.8 $(293.1)$6,283.8 

March 31, 2022Amortized
Cost		Allowance for Credit LossesNet Carrying AmountGross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Held-to-Maturity:
U.S. Treasury notes$296.2 $— $296.2 $— $— $296.2 
State, county, and municipal securities197.3 (0.1)197.2 0.8 (21.4)176.6 
Obligations of U.S. government agencies340.8 — 340.8 — (32.3)308.5 
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations (1)
2,302.0 — 2,302.0 18.2 (152.4)2,167.8 
Corporate securities84.0 (1.5)82.5 0.2 (2.7)80.0 
Total$3,220.3 $(1.6)$3,218.7 $19.2 $(208.8)$3,029.1 
(1) Amortized cost presented above include $21.8 million of unamortized losses and $17.9 million of unamortized gains in U.S. agency residential and commercial mortgage-backed securities and collateralized mortgage obligations related to the 2021 and 2022 transfer of securities from available-for-sale to held-to-maturity.
December 31, 2021Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Available-for-Sale:
U.S. Treasury notes$697.6 $— $(12.9)$684.7 
State, county, and municipal securities434.7 2.1 (9.3)427.5 
Obligations of U.S. government agencies356.0 0.1 (9.2)346.9 
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations2,027.3 14.1 (23.3)2,018.1 
Private mortgage-backed securities174.4 0.1 (1.1)173.4 
Collateralized loan obligation898.2 1.2 — 899.4 
Corporate securities
271.1 3.0 (3.6)270.5 
Total$4,859.3 $20.6 $(59.4)$4,820.5 
December 31, 2021Amortized
Cost		Allowance for Credit LossesNet Carrying AmountGross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Held-to-Maturity:
State, county, and municipal securities$67.6 $— $67.6 $2.0 $(0.4)$69.2 
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations(1)
1,609.0 — 1,609.0 13.2 (35.3)1,586.9 
Corporate securities
11.0 — 11.0 0.4 — 11.4 
Total$1,687.6 $— $1,687.6 $15.6 $(35.7)$1,667.5 
(1) Amortized cost presented above include $20.1 million of unamortized gains in U.S. agency residential and commercial mortgage-backed securities and collateralized mortgage obligations related to the 2021 transfer of securities from available-for-sale to held-to-maturity.
Gross Unrealized Losses and Fair Values of Investment Securities
The following tables show the gross unrealized losses and fair values of investment securities, aggregated by investment category, and the length of time individual investment securities have been in an unrealized loss position as of March 31, 2022 and December 31, 2021.
 Less than 12 Months12 Months or MoreTotal
March 31, 2022Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
Available-for-Sale:      
U.S. Treasury notes$644.9 $(53.3)$— $— $644.9 $(53.3)
State, county, and municipal securities223.6 (22.7)29.6 (5.1)253.2 (27.8)
Obligations of U.S. government agencies101.5 (5.4)15.4 (1.3)116.9 (6.7)
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations3,238.5 (163.4)84.9 (8.4)3,323.4 (171.8)
Private mortgage-backed securities274.8 (13.6)— — 274.8 (13.6)
Collateralized loan obligations1,020.9 (4.5)— — 1,020.9 (4.5)
Corporate securities146.7 (13.5)19.3 (1.9)166.0 (15.4)
Total$5,650.9 $(276.4)$149.2 $(16.7)$5,800.1 $(293.1)
 Less than 12 Months12 Months or MoreTotal
December 31, 2021Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
Available-for-Sale:      
U.S. Treasury notes$684.7 $(12.9)$— $— $684.7 $(12.9)
State, county, and municipal securities278.7 (9.1)5.0 (0.2)283.7 (9.3)
Obligations of U.S. government agencies297.0 (8.9)16.4 (0.3)313.4 (9.2)
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations1,262.8 (23.0)26.4 (0.3)1,289.2 (23.3)
Private mortgage-backed securities127.2 (1.1)— — 127.2 (1.1)
Corporate securities109.9 (3.3)20.9 (0.3)130.8 (3.6)
Total$2,760.3 $(58.3)$68.7 $(1.1)$2,829.0 $(59.4)
Debt Securities, Held-to-maturity, Allowance for Credit Loss
The following table presents the activity in the allowance for credit losses related to held-to-maturity securities classified as corporate and state, county, and municipal securities:
Three Months Ended March 31,
20222021
Beginning balance$— $— 
Provision for credit loss expense1.6 — 
Ending balance of allowance for credit losses$1.6 $— 
Maturities of Investment Securities , the Company had variable rate mortgage-backed and corporate securities which had an amortized cost of $253.0 million and were classified as available-for-sale as of March 31, 2022. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates.
 Available-for-SaleHeld-to-Maturity
March 31, 2022Amortized
Cost		Estimated
Fair Value		Amortized
Cost		Estimated
Fair Value
Within one year$926.6 $886.6 $377.1 $355.3 
After one year but within five years2,724.4 2,592.0 1,334.1 1,274.0 
After five years but within ten years1,139.8 1,074.3 1,026.2 956.0 
After ten years1,784.3 1,730.9 482.9 443.8 
Total$6,575.1 $6,283.8 $3,220.3 $3,029.1 
Debt Securities, Held-to-maturity, Credit Quality Indicator The following table summarizes the credit quality indicators of held-to-maturity securities at amortized cost for the periods indicated:
March 31, 2022AAAAAABBBNot RatedTotal
U.S. Treasury notes$296.2 $— $— $— $— $296.2 
State, county, and municipal securities72.6 102.7 13.7 — 8.3 197.3 
Obligations of U.S. government agencies340.8 — — — — 340.8 
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
FNMA/FHLMC1,958.2 — — — — 1,958.2 
GNMA343.8 — — — — 343.8 
Corporate securities— — 4.0 75.0 5.0 84.0 
Total$3,011.6 $102.7 $17.7 $75.0 $13.3 $3,220.3 
December 31, 2021AAAAAABBBNot RatedTotal
State, county, and municipal securities$17.2 $31.6 $14.7 $— $4.1 $67.6 
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations
FNMA/FHLMC1,439.1 — — — — 1,439.1 
GNMA169.9 — — — — 169.9 
Corporate securities— — 4.0 7.0 — 11.0 
Total$1,626.2 $31.6 $18.7 $7.0 $4.1 $1,687.6