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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
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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