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INVESTMENT SECURITIES, Investment Securities in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Jun. 30, 2015
USD ($)
Position
Dec. 31, 2014
USD ($)
Position
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 214 28
12 months or longer | Position 26 71
Total | Position 240 99
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]    
Less than 12 months $ 611,156 $ 16,458
12 months or longer 36,259 166,383
Total 647,415 182,841
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 5,738 35
12 months or longer 1,471 2,219
Total $ 7,209 $ 2,254
U.S. Treasury and Agency Obligations [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 14 0
12 months or longer | Position 0 4
Total | Position 14 4
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]    
Less than 12 months $ 493,707 $ 0
12 months or longer 0 102,363
Total 493,707 102,363
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 3,078 0
12 months or longer 0 910
Total $ 3,078 $ 910
Obligations of State and Political Subdivisions [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 193 23
12 months or longer | Position 3 46
Total | Position 196 69
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]    
Less than 12 months $ 104,687 $ 13,413
12 months or longer 1,171 26,490
Total 105,858 39,903
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 2,523 34
12 months or longer 76 210
Total $ 2,599 $ 244
Government Agency Mortgage-Backed Securities [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 7 3
12 months or longer | Position 20 19
Total | Position 27 22
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]    
Less than 12 months $ 12,762 $ 5
12 months or longer 32,348 34,770
Total 45,110 34,775
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 137 0
12 months or longer 1,333 1,025
Total $ 1,470 $ 1,025
Corporate Debt Securities [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 0 1
12 months or longer | Position 1 1
Total | Position 1 2
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]    
Less than 12 months $ 0 $ 3,040
12 months or longer 2,736 2,755
Total 2,736 5,795
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 0 1
12 months or longer 62 74
Total $ 62 $ 75
Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 0 1
12 months or longer | Position 2 1
Total | Position 2 2
Available-for-Sale Portfolio in Unrealized Loss Positions, Fair Value [Abstract]    
Less than 12 months $ 0 $ 0
12 months or longer 4 5
Total 4 5
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 0 0
12 months or longer 0 0
Total $ 0 $ 0