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RELATED-PARTY TRANSACTIONS - Transaction Involving Halle Benett and Former Chairman Timothy R. Chrisman (Details) - USD ($)					9 Months Ended	12 Months Ended
	Apr. 08, 2015	Apr. 06, 2015	May. 21, 2014	May. 15, 2014	Sep. 30, 2015	Dec. 31, 2014
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%	7.375%
Price per share of depository shares (in usd per share)	$ 25
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	$ 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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