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SECURITIES AVAILABLE FOR SALE AND HELD TO MATURITY (Details 3) (USD $)
 9 Months Ended
Sep. 30, 2014
item
Dec. 31, 2013
Securities available for sale    
Less Than Twelve Months, Gross Unrealized Losses $ 3,236,000 $ 15,203,000
Less Than Twelve Months, Fair Value 272,386,000 510,469,000
Over Twelve Months, Gross Unrealized Losses 7,013,000 2,096,000
Over Twelve Months, Fair Value 185,686,000 5,675,000
Total Gross Unrealized Losses 10,249,000 17,299,000
Total Fair Value 458,072,000 516,144,000
Securities held to maturity    
Less Than Twelve Months, Gross Unrealized Losses   57,000
Less Than Twelve Months, Fair Value   9,429,000
Over Twelve Months, Gross Unrealized Losses 213,000 357,000
Over Twelve Months, Fair Value 7,856,000 7,901,000
Total Gross Unrealized Losses 213,000 414,000
Total Fair Value 7,856,000 17,330,000
Securities available for sale and held to maturity    
Less Than Twelve Months, Gross Unrealized Losses 3,236,000 15,260,000
Less Than Twelve Months, Fair Value 272,686,000 519,898,000
Over Twelve Months, Gross Unrealized Losses 7,226,000 2,453,000
Over Twelve Months, Fair Value 193,542,000 13,576,000
Total Gross Unrealized Losses 10,462,000 17,713,000
Total Fair Value 465,928,000 533,474,000
Debt Securities    
Total unrealized losses 10,249,000 17,299,000
Fair value of investment 1,058,965,000 760,048,000
Level 3
    
Debt Securities    
Fair value of investment 2,296,000 1,964,000
Trust preferred securities | Level 3
    
Debt Securities    
Fair value of investment 1,500,000  
Debt securities
    
Securities available for sale    
Less Than Twelve Months, Gross Unrealized Losses 1,542,000 15,086,000
Less Than Twelve Months, Fair Value 252,221,000 508,816,000
Over Twelve Months, Gross Unrealized Losses 6,510,000 1,878,000
Over Twelve Months, Fair Value 181,099,000 3,893,000
Total Gross Unrealized Losses 8,052,000 16,964,000
Total Fair Value 433,320,000 512,709,000
Debt Securities    
Total unrealized losses 8,052,000 16,964,000
Fair value of investment 1,008,485,000 738,075,000
Debt securities | Municipal bonds and obligations
    
Securities available for sale    
Less Than Twelve Months, Gross Unrealized Losses 6,000 1,657,000
Less Than Twelve Months, Fair Value 995,000 17,776,000
Over Twelve Months, Gross Unrealized Losses 232,000 313,000
Over Twelve Months, Fair Value 9,971,000 1,854,000
Total Gross Unrealized Losses 238,000 1,970,000
Total Fair Value 10,966,000 19,630,000
Debt Securities    
Number of securities in the portfolio of AFS 185  
Number of AFS investment securities in unrealized loss positions 17  
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 2.10%  
Total unrealized losses 238,000 1,970,000
Fair value of investment 135,524,000 77,671,000
Debt securities | Residential mortgage-backed securities
    
Debt Securities    
Number of securities in the portfolio of AFS 197  
Number of AFS investment securities in unrealized loss positions 65  
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 1.60%  
Debt securities | Government guaranteed residential mortgage-backed securities
    
Securities available for sale    
Less Than Twelve Months, Gross Unrealized Losses 163,000 658,000
Less Than Twelve Months, Fair Value 29,109,000 35,631,000
Over Twelve Months, Gross Unrealized Losses 172,000  
Over Twelve Months, Fair Value 7,520,000  
Total Gross Unrealized Losses 335,000 658,000
Total Fair Value 36,629,000 35,631,000
Debt Securities    
Total unrealized losses 335,000 658,000
Fair value of investment 74,282,000 78,771,000
Debt securities | Government-sponsored residential mortgage-backed securities
    
Securities available for sale    
Less Than Twelve Months, Gross Unrealized Losses 1,373,000 10,783,000
Less Than Twelve Months, Fair Value 222,117,000 423,203,000
Over Twelve Months, Gross Unrealized Losses 4,932,000  
Over Twelve Months, Fair Value 158,167,000  
Total Gross Unrealized Losses 6,035,000 10,783,000
Total Fair Value 380,284,000 423,203,000
Debt Securities    
Total unrealized losses 6,305,000 10,783,000
Fair value of investment 777,571,000 522,658,000
Debt securities | Corporate bonds
    
Securities available for sale    
Less Than Twelve Months, Gross Unrealized Losses   1,822,000
Less Than Twelve Months, Fair Value   29,124,000
Total Gross Unrealized Losses   1,822,000
Total Fair Value   29,124,000
Debt Securities    
Total unrealized losses   1,822,000
Fair value of investment 2,556,000 39,280,000
Debt securities | Trust preferred securities
    
Securities available for sale    
Over Twelve Months, Gross Unrealized Losses 1,096,000 1,565,000
Over Twelve Months, Fair Value 2,458,000 2,039,000
Total Gross Unrealized Losses 1,096,000 1,565,000
Total Fair Value 2,458,000 2,039,000
Debt Securities    
Number of securities in the portfolio of AFS 2  
Number of AFS securities remains investment grade rated 1  
Number of AFS investment securities in unrealized loss positions 5  
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 30.80%  
Total unrealized losses 1,096,000 1,565,000
Fair value of investment 15,398,000 16,611,000
Amount of security issued by banking and insurance entities 360,000,000  
Protection from credit loss afforded in excess subordination above current and projected losses 57,200,000  
Debt securities | Other bonds and obligations
    
Securities available for sale    
Less Than Twelve Months, Gross Unrealized Losses   166,000
Less Than Twelve Months, Fair Value   3,082,000
Over Twelve Months, Gross Unrealized Losses 78,000  
Over Twelve Months, Fair Value 2,983,000  
Total Gross Unrealized Losses 78,000 166,000
Total Fair Value 2,983,000 3,082,000
Debt Securities    
Number of securities in the portfolio of AFS 8  
Number of AFS investment securities in unrealized loss positions 4  
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 2.50%  
Total unrealized losses 78,000 166,000
Fair value of investment 3,154,000 3,084,000
Debt securities | Tax advantaged economic development bonds
    
Securities held to maturity    
Less Than Twelve Months, Gross Unrealized Losses   57,000
Less Than Twelve Months, Fair Value   9,429,000
Over Twelve Months, Gross Unrealized Losses 213,000 357,000
Over Twelve Months, Fair Value 7,856,000 7,901,000
Total Gross Unrealized Losses 213,000 414,000
Total Fair Value 7,856,000 17,330,000
Debt Securities    
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 2.60%  
Number of HTM investment securities in unrealized loss positions 1  
Number of securities in the portfolio of HTM 7  
Debt securities | Mezzanine Class B tranche
    
Debt Securities    
Total unrealized losses 1,000,000  
Fair value of investment 2,800,000  
Marketable equity securities
    
Securities available for sale    
Less Than Twelve Months, Gross Unrealized Losses 1,694,000 117,000
Less Than Twelve Months, Fair Value 20,165,000 1,653,000
Over Twelve Months, Gross Unrealized Losses 503,000 218,000
Over Twelve Months, Fair Value 4,587,000 1,782,000
Total Gross Unrealized Losses 2,197,000 335,000
Total Fair Value 24,752,000 3,435,000
Debt Securities    
Number of securities in the portfolio of AFS 30  
Number of AFS investment securities in unrealized loss positions 12  
Aggregate unrealized losses as a percentage of the amortized cost of the securities in unrealized loss positions 8.20%  
Total unrealized losses 2,197,000 335,000
Fair value of investment $ 50,480,000 $ 21,973,000