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RELATED-PARTY TRANSACTIONS - Transactions Involving Underwriting Services (Details) - USD ($) |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 08, 2016 | Feb. 08, 2016 | Apr. 08, 2015 | Apr. 06, 2015 | May. 21, 2014 | Mar. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Expenses from transactions with related parties |  |  |  | $ 263,000 |  |  |
Expenses from transactions with related parties, net of related expenses |  |  |  | 221,000 |  |  |
Common Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Issuance of stock shares | 4,850,000 |  |  |  |  |  |
Senior Notes | 5.25% 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 |  | $ 944,000 | $ 590,000 |  |  |  |
Expenses from transactions with related parties, net of related expenses |  | $ 849,000 | $ 515,000 |  |  |  |
Director | Underwriting Fees | Common Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Expenses from transactions with related parties | $ 1,000,000 |  |  |  | $ 521,000 |  |
Expenses from transactions with related parties, net of related expenses | $ 846,000 |  |  |  | $ 481,000 |  |
Series E Preferred Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Depository shares to preferred stock ratio |  | 2.50% |  |  |  |  |
Non cumulative preferred stock, dividend rate |  | 7.00% |  |  |  | 7.00% | 7.00%
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 1,000 |  |  |  | $ 1,000 | $ 1,000
Offering price per share |  | $ 25 |  |  |  |  |
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% | 7.375%
Preferred stock, liquidation preference per share (in dollars per share) |  |  | $ 1,000 |  |  | $ 1,000 | $ 1,000
Offering price per share |  |  | $ 25 |  |  |  |
Underwritten Public Offering |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Depository shares issued |  | 5,000,000 | 4,600,000 |  |  |  |
Offering price per share |  | $ 25 | $ 25 |  |  |  |
Underwritten Public Offering | Common Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Issuance of stock shares | 5,577,500 |  |  |  | 5,922,500 |  |
Underwritten Public Offering | Series E Preferred Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Depository shares issued |  | 5,000,000 |  |  |  |  |
Depository shares to preferred stock ratio |  | 2.50% |  |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 1,000 |  |  |  |  |
Underwritten Public Offering | Series D Preferred Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Depository shares to preferred stock ratio |  |  | 2.50% |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  | $ 1,000 |  |  |  |

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