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RELATED-PARTY TRANSACTIONS - Transactions Involving Underwriting Services (Details) - USD ($) | Oct. 27, 2016 | May 11, 2016 | Mar. 08, 2016 | Feb. 08, 2016 | Apr. 08, 2015 | Apr. 06, 2015 | May 21, 2014 | Sep. 30, 2017
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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 |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  |  |  |  |  |  | $ 1,000
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% |  |
Series E 7.00% non-cumulative perpetual |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Depository shares to preferred stock ratio |  |  |  | 2.50% |  |  |  |
Non cumulative preferred stock, dividend rate |  |  |  | 7.00% |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) |  |  |  | $ 1,000 |  |  |  |
Offering price per share (in dollars per share) |  |  |  | $ 25 |  |  |  |
Series D 7.375% non-cumulative perpetual |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Non cumulative preferred stock, dividend rate |  |  |  |  | 7.375% |  |  |
Common Stock |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Issuance of stock shares (in shares) |  | 5,250,000 | 4,850,000 |  |  |  |  |
Underwritten Public Offering |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Depository shares issued (in shares) |  |  |  | 5,000,000 | 4,600,000 |  |  |
Offering price per share (in dollars per share) |  |  |  | $ 25 | $ 25 |  |  |
Underwritten Public Offering | Series E 7.00% non-cumulative perpetual |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Depository shares issued (in shares) |  |  |  | 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 7.375% non-cumulative perpetual |  |  |  |  |  |  |  |
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 |  |  |
Underwritten Public Offering | Common Stock |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Issuance of stock shares (in shares) |  |  | 5,577,500 |  |  |  | 5,922,500 |
Director | Financial Advisory Services |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Expenses from transactions with related parties | $ 516,000 |  |  |  |  |  |  |
Expenses from transactions with related parties, net of related expenses | $ 500,000 |  |  |  |  |  |  |
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 |

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