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v3.22.2.2

Subordinated Debentures and Convertible Notes - Narrative (Details) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 07, 2018 $ / shares | Sep. 30, 2022 USD ($) grantorTrust | Sep. 30, 2021 USD ($) | Jun. 30, 2022 | Sep. 30, 2022 USD ($) grantorTrust | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Jun. 06, 2018 USD ($)
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |
Number of wholly owned subsidiary grantor trusts | grantorTrust |  | 9 |  |  | 9 |  |  |
Amount of pooled trust preferred securities issued |  | $ 126,000,000 |  |  | $ 126,000,000 |  |  |
Right to defer consecutive payments of interest, maximum term |  |  |  |  | 5 years |  |  |
Carrying value of Debentures |  | 106,258,000 |  |  | $ 106,258,000 |  | $ 105,354,000 |
Interest on other borrowings and convertible notes |  | 2,936,000 | $ 2,290,000 |  | 7,878,000 | $ 6,892,000 |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Additional paid-in capital |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |
Adjustments to additional paid in capital, equity component of convertible debt, net of tax |  | 18,300,000 |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |
Investment in common trust securities |  | 3,900,000 |  |  | 3,900,000 |  | 3,900,000 |
Carrying Value of Debentures |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |
Carrying value of Debentures |  | 106,258,000 |  |  | 106,258,000 |  | 105,400,000 |
Remaining discounts on acquired Debentures |  | 23,600,000 |  |  | 23,600,000 |  | $ 24,500,000 |
Trust Preferred Securities Subject to Mandatory Redemption |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |
Amount of pooled trust preferred securities issued |  | $ 126,000,000 |  |  | $ 126,000,000 |  |  |
Percent included in tier one capital, maximum |  | 25.00% |  |  | 25.00% |  |  |
Excess of percent threshold included in tier two capital |  | 25.00% |  |  | 25.00% |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount issued |  | $ 217,500,000 |  |  | $ 217,500,000 |  |  | $ 217,500,000
Interest rate |  |  |  |  |  |  |  | 2.00%
Initial conversion rate | 0.0450760 |  |  |  | 0.0450760 |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 22.18 |  |  |  |  |  |  |
Premium percentage to closing stock price on date of pricing of the notes | 22.50% |  |  |  |  |  |  |
Call option, percentage of principal amount in cash | 100.00% |  |  |  |  |  |  |
Repurchase or put option, percentage of principal amount in cash | 100.00% |  |  |  |  |  |  |
Interest expense on convertible notes |  | $ 1,300,000 | $ 1,300,000 |  | $ 4,000,000 | $ 4,000,000 |  |
Number of outstanding years for which non-cash interest expense and issuance cost capitalization expense will be recorded | 5 years |  |  | 5 years | 5 years |  |  |
Convertible Notes | Discount Rate |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |
Discount rate | 0.0425 |  |  |  |  |  |  |

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