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RELATED-PARTY TRANSACTIONS - Transactions Involving Underwriting Services (Details) - USD ($) $ / shares in Units, $ in Thousands | Oct. 27, 2016 | Mar. 08, 2016 | Feb. 08, 2016
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Series E 7.00% non-cumulative perpetual |  |  |
Related Party Transaction [Line Items] |  |  |
Non cumulative preferred stock, dividend rate |  |  | 7.00%
Underwritten Public Offering |  |  |
Related Party Transaction [Line Items] |  |  |
Depository shares issued (in shares) |  |  | 5,000,000
Offering price per share (in dollars per share) |  |  | $ 25
Underwritten Public Offering | Series E 7.00% 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 |
Director | Financial Advisory Services |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties | $ 516 |  |
Expenses from transactions with related parties, net of related expenses | $ 500 |  |
Director | Underwriting Fees |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties |  |  | $ 944
Expenses from transactions with related parties, net of related expenses |  |  | $ 849
Director | Underwriting Fees | Common Stock |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties |  | $ 1,000 |
Expenses from transactions with related parties, net of related expenses |  | $ 846 |

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