JUNIOR SUBORDINATED DEBT SECURITIES 2013 (Details) - USD ($)		12 Months Ended
	Dec. 01, 2005	Dec. 31, 2016	Dec. 31, 2004	Jan. 08, 2014	Mar. 01, 2007
Debt Instrument [Line Items]
Credit Agreement borrowing capacity		$ 795,000,000
Unsecured Revolving Loan [Member]
Debt Instrument [Line Items]
Maturity date		Aug. 08, 2015
Credit Agreement borrowing capacity		$ 25,000,000
Multi-Draw Term Loan [Member]
Debt Instrument [Line Items]
Credit Agreement borrowing capacity		$ 60,000,000
Junior Subordinated Debt Securities of Business Holding Company Trust I [Member]
Debt Instrument [Line Items]
Junior Subordinated Debt Securities			$ 6,200,000
Number of shares of trust preferred securities			6,000
Interest rate spread over LIBOR			2.85%
Junior Subordinated Debt Securities of American State Capital Trust I [Member]
Debt Instrument [Line Items]
Junior Subordinated Debt Securities	$ 6,700,000
Number of shares of trust preferred securities	6,500
Interest rate spread over LIBOR	2.80%
Junior Subordinated Debt Securities of Signature Bancshares Preferred Trust I [Member]
Debt Instrument [Line Items]
Junior Subordinated Debt Securities				$ 8,200,000	$ 8,200,000
Number of shares of trust preferred securities					8,000
Junior Subordinated Debt Securities of City Bancorp Preferred Trust I [Member]
Debt Instrument [Line Items]
Junior Subordinated Debt Securities					$ 10,300,000
Number of shares of trust preferred securities					10,000