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Subordinated Debentures and Convertible Notes - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 07, 2018 USD ($) $ / shares | Apr. 26, 2018 USD ($) | Jun. 30, 2019 USD ($) grantor_trust | Dec. 31, 2018 USD ($) shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) grantor_trust shares | Sep. 30, 2018 USD ($) shares | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) shares | May 11, 2018 USD ($)
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |  |  |
Number of wholly owned subsidiary grantor trusts | grantor_trust |  |  | 9 |  |  | 9 |  |  |  |
Amount of pooled trust preferred securities issued |  |  | $ 126,000,000.0 |  |  | $ 126,000,000.0 |  |  |  |
Right to defer consecutive payments of interest, maximum term |  |  |  |  |  | 5 years |  |  |  |
Proceeds from convertible notes, net of issuance fees |  |  |  |  |  | $ 0 |  | $ 212,920,000 |  |
Repurchase of treasury stock |  |  |  | $ 50,000,000.0 | $ 78,961,000 | $ 100,000,000.0 |  | 78,961,000 |  |
Common stock repurchased and recorded as treasury stock (in shares) | shares |  |  |  | 3,436,757 |  | 0 | 5,565,696 |  | 9,002,453 |
Other assets |  |  |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in common trust securities |  |  |  | $ 3,900,000 |  |  |  |  | $ 3,900,000 |
Carrying Value of Debentures |  |  |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized Discount on Acquired Subordinated Debt |  |  | 27,400,000 | $ 28,000,000.0 |  | $ 27,400,000 |  |  | 28,000,000.0 |
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 |  | $ 217,500,000 |  | $ 200,000,000
Interest rate |  |  |  |  |  |  |  |  |  | 2.00%
Additional face amount issued as part of initial offering over-allotment option | $ 17,500,000 |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |
Amount of proceeds from convertible notes authorized for repurchase of common stock | $ 100,000,000.0 | $ 100,000,000.0 |  |  |  |  |  |  |  |
Proceeds from convertible notes, net of issuance fees | 213,200,000 |  |  |  |  |  |  |  |  |
Proceeds down-streamed to the Bank as equity | 113,200,000 |  |  |  |  |  |  |  |  |
Repurchase of treasury stock | $ 76,000,000.0 |  |  |  |  |  | $ 24,000,000.0 |  | $ 150,000,000.0 |
Closing price of common stock (in dollars per share) | $ / shares | $ 18.11 |  |  |  |  |  |  |  |  |
Amortization/ Capitalization Period | 5 years |  |  |  |  | 5 years |  |  | 5 years |
Interest expense on convertible notes |  |  | $ 2,300,000 |  | $ 1,200,000 | $ 4,600,000 |  |  |  |
Discount Rate | Convertible Notes |  |  |  |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |  |  |  |
Discount rate | 0.0425 |  |  |  |  |  |  |  |  |

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