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RELATED-PARTY TRANSACTIONS - Transactions Involving Underwriting Services (Details) - USD ($)						12 Months Ended
	Feb. 08, 2016	Apr. 08, 2015	Apr. 06, 2015	May. 21, 2014	Jun. 21, 2013	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				5,150,000	2,268,000
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%			5.25%
Director | Underwriting Fees
Related Party Transaction [Line Items]
Expenses from transactions with related parties		$ 590,000
Expenses from transactions with related parties, net of related expenses		$ 515,000
Director | Underwriting Fees | Common Stock
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
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%
Preferred stock, liquidation preference per share (in dollars per share)		$ 1,000				$ 1,000
Offering price per share		$ 25.00
Underwritten Public Offering
Related Party Transaction [Line Items]
Depository shares issued		4,600,000
Offering price per share		$ 25
Underwritten Public Offering | Common Stock
Related Party Transaction [Line Items]
Issuance of stock shares				5,922,500
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
Subsequent Event | Director | Underwriting Fees
Related Party Transaction [Line Items]
Expenses from transactions with related parties	$ 944,000
Expenses from transactions with related parties, net of related expenses	$ 849,000
Subsequent Event | 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%
Preferred stock, liquidation preference per share (in dollars per share)	$ 1,000
Offering price per share	$ 25.00
Issuance of stock shares	125,000
Subsequent Event | Underwritten Public Offering
Related Party Transaction [Line Items]
Depository shares issued	5,000,000
Offering price per share	$ 25
Subsequent Event | Underwritten Public Offering | Series E 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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