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Investment Securities - Proceeds from Calls and Sales, Realized Gains and Losses and Interest Income Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Proceeds from calls and sales of investment securities and other assets |  |  |
Proceeds from calls of investment securities | $ 8.6 | $ 102.0 | $ 63.0
Proceeds from sales of investment securities | 2.5 | 543.0 | 1,000.0
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |
Gross realized gains on sales of investment securities | 0.1 | 0.6 | 0.5
Gross realized losses on sales of investment securities | 0.0 | 0.7 | 3.2
Income tax benefit related to net realized loss on sale of investment securities |  | 0.0 | 0.7
Income tax expense related to net realized gains on sale of investment securities | 0.0 |  |
Interest income from taxable and nontaxable investment securities |  |  |
Interest income from taxable investment securities | 93.3 | 80.9 | 92.5
Interest income from non-taxable investment securities | $ 8.1 | $ 0.9 | $ 0.0

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- Definition This item represents the amount of tax expense (benefit) of net total realized gain (loss) included in earnings for the period as a result of selling marketable securities and any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References No definition available. + Details
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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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- Definition Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.2) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (a) Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph (b) -Subparagraph (1) + Details
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