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SECURITIES - Schedule of Debt and Equity Securities Components (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
AVAILABLE FOR SALE:    
Amortized Cost $ 1,378,740 $ 943,867
Gross unrealized gains 48,995 58,506
Gross unrealized losses, OTTI 1,754 2,426
Gross unrealized losses, other 1,914 865
Estimated fair value 1,424,067 999,082
HELD TO MATURITY:    
Held-to-maturity Securities 246,547 367,127
Held-to-maturity Securities, Unrecognized Holding Gain 8,898 16,218
Held To Maturity Securities Unrecognized Holding Other Than Temporary Impairment Loss 0 0
Held To Maturity Securities Unrecognized Holding Loss Other 47 54
Held-to-maturity Securities, Fair Value 255,398 383,291
U.S. Government Agency Debentures
   
AVAILABLE FOR SALE:    
Amortized Cost 61,461 0
Gross unrealized gains 0 0
Gross unrealized losses, OTTI 0 0
Gross unrealized losses, other 598 0
Estimated fair value 60,863 0
State and Political Subdivisions
   
AVAILABLE FOR SALE:    
Amortized Cost 515,116 251,281
Gross unrealized gains 30,888 31,221
Gross unrealized losses, OTTI 0 0
Gross unrealized losses, other 316 45
Estimated fair value 545,688 282,457
HELD TO MATURITY:    
Held-to-maturity Securities 1,009 1,010
Held-to-maturity Securities, Unrecognized Holding Gain 128 196
Held To Maturity Securities Unrecognized Holding Other Than Temporary Impairment Loss 0 0
Held To Maturity Securities Unrecognized Holding Loss Other 0 0
Held-to-maturity Securities, Fair Value 1,137 1,206
Other Stocks and Bonds
   
AVAILABLE FOR SALE:    
Amortized Cost 12,807 2,925
Gross unrealized gains 104 0
Gross unrealized losses, OTTI 1,754 2,426
Gross unrealized losses, other 1 0
Estimated fair value 11,156 499
HELD TO MATURITY:    
Held-to-maturity Securities 0 486
Held-to-maturity Securities, Unrecognized Holding Gain 0 15
Held To Maturity Securities Unrecognized Holding Other Than Temporary Impairment Loss 0 0
Held To Maturity Securities Unrecognized Holding Loss Other 0 0
Held-to-maturity Securities, Fair Value 0 501
U.S. Government Agencies
   
AVAILABLE FOR SALE:    
Amortized Cost 86,182 99,974
Gross unrealized gains 3,636 7,158
Gross unrealized losses, OTTI 0 0
Gross unrealized losses, other 15 80
Estimated fair value 89,803 107,052
HELD TO MATURITY:    
Held-to-maturity Securities 20,135 22,999
Held-to-maturity Securities, Unrecognized Holding Gain 1,191 1,159
Held To Maturity Securities Unrecognized Holding Other Than Temporary Impairment Loss 0 0
Held To Maturity Securities Unrecognized Holding Loss Other 47 43
Held-to-maturity Securities, Fair Value 21,279 24,115
Government-Sponsored Enterprises
   
AVAILABLE FOR SALE:    
Amortized Cost 703,174 589,687
Gross unrealized gains 14,367 20,127
Gross unrealized losses, OTTI 0 0
Gross unrealized losses, other 984 740
Estimated fair value 716,557 609,074
HELD TO MATURITY:    
Held-to-maturity Securities 225,403 342,632
Held-to-maturity Securities, Unrecognized Holding Gain 7,579 14,848
Held To Maturity Securities Unrecognized Holding Other Than Temporary Impairment Loss 0 0
Held To Maturity Securities Unrecognized Holding Loss Other 0 11
Held-to-maturity Securities, Fair Value $ 232,982 $ 357,469