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RELATED-PARTY TRANSACTIONS - Transaction Involving Halle Benett and Former Chairman Timothy R. Chrisman (Details) - USD ($) |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 08, 2015 | Apr. 06, 2015 | May. 21, 2014 | May. 15, 2014 | Jun. 30, 2015
Related Party Transaction [Line Items] |  |  |  |  |
Underwriters option period | 30 days |  |  |  |
Series D Preferred Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Depository shares to preferred stock ratio | 2.50% |  |  |  |
Non cumulative preferred stock, dividend rate | 7.375% |  |  |  | 7.375%
Price per share of depository shares (in usd per share) | $ 25 |  |  |  |
Senior Notes | Five Point Two Five Percent Senior Notes Due April 15, 2025 |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Aggregate principal amount issued |  | $ 175,000,000 |  |  |
Stated interest rate |  | 5.25% |  |  |
Director | Underwriting Fees |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related parties | $ 590,000 | $ 263,000 |  |  |
Expenses from transactions with related parties, net of related expenses | $ 515,000 | $ 221,000 |  |  |
Former Chairman | Former Management Member |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related parties |  |  |  | $ 200,000 | $ 0
Strategic advisor agreement period |  |  |  | 1 year |
Underwritten Public Offering |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Depository shares issued | 4,000,000 |  |  |  |
Price per share of depository shares (in usd per share) | $ 25.00 |  |  |  |
Underwritten Public Offering | Series D Preferred Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Depository shares to preferred stock ratio | 2.50% |  |  |  |
Non cumulative preferred stock, dividend rate | 7.375% |  |  |  |
Liquidation preference value | $ 1,000 |  |  |  |
Over Allotment Option |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Depository shares issued | 600,000 |  |  |  |
Over Allotment Option | Series D Preferred Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Underwriters option period | 30 days |  |  |  |
Common Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Issuance of stock shares |  |  | 5,150,000 |  |
Underwriters option period |  |  | 30 days |  |
Common Stock | Director | Underwriting Fees |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related parties |  |  | $ 521,000 |  |
Expenses from transactions with related parties, net of related expenses |  |  | $ 481,000 |  |
Common Stock | Underwritten Public Offering |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Issuance of stock shares |  |  | 5,150,000 |  |
Common Stock | Over Allotment Option |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Issuance of stock shares |  |  | 772,500 |  |
Underwriters option period |  |  | 30 days |  |

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