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Borrowings - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 24, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |  |  |
Securities sold under customer repurchase agreements |  | $ 646.0 |  | $ 646.0 |  | $ 589.0
Gain on extinguishment of debt |  | 0.0 | $ 0.0 | 6.0 | $ 0.0 |
Debt instrument, collateral amount |  | 25,800.0 |  | 25,800.0 |  |
Line of credit facility, remaining borrowing capacity |  | 75.0 |  | 75.0 |  |
Government agency | Asset Pledged as Collateral |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Securities sold under customer repurchase agreements |  |  |  |  |  | 508.0
Commercial mortgage-backed securities | Asset Pledged as Collateral |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Securities sold under customer repurchase agreements |  |  |  |  |  | 81.0
Securities Assets | Asset Pledged as Collateral |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Securities sold under customer repurchase agreements |  | 658.0 |  | 658.0 |  | 619.0
Trust Preferred Securities Subject to Mandatory Redemption |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | 128.0 |  | 128.0 |  | 128.0
Fixed-to-Floating subordinated notes at 3.375% | Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | $ 350.0 |  | $ 350.0 |  |
Debt instrument, stated interest rate |  | 3.375% |  | 3.375% |  |
Fixed subordinated notes at 6.125% | Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | $ 400.0 |  | $ 400.0 |  |
Debt instrument, stated interest rate |  | 6.125% |  | 6.125% |  |
Fixed-to-Fixed subordinated notes at 4.125% | Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | $ 100.0 |  | $ 100.0 |  |
Debt instrument, stated interest rate |  | 4.125% |  | 4.125% |  |
Junior subordinated debentures | Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | $ 132.0 |  | $ 132.0 |  |
Other secured financings | Secured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, collateral amount |  | 16.0 |  | 16.0 |  |
Debt instrument, face amount |  | 16.0 |  | 16.0 |  |
Other secured financings | Secured Debt | Federal Reserve Bank of Richmond |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, collateral amount |  | 5,100.0 |  | 5,100.0 |  |
Line of credit facility, additional borrowing capacity |  | 4,200.0 |  | 4,200.0 |  |
Long-term line of credit |  | 0.0 |  | 0.0 |  | $ 0.0
Fixed rate senior unsecured notes | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | $ 866.0 |  | $ 866.0 |  |
Debt, weighted average interest rate |  | 3.70% |  | 3.70% |  |
Fixed rate senior unsecured notes assumed in business combination | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redemption of debt | $ 2,900.0 |  |  |  |  |
Gain on extinguishment of debt | $ 6.0 |  |  |  |  |
Unsecured term loan at 1-month LIBOR plus 1.10% | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | $ 61.0 |  | $ 61.0 |  |
Unsecured term loan at 1-month LIBOR plus 1.10% | Senior Notes | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.10% |  |
Notes Payable To FHLB | Secured Debt | Asset Pledged as Collateral |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, collateral amount |  | $ 20,700.0 |  | $ 20,700.0 |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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