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INVESTMENT SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   $ 2,599,018 $ 2,936,290
Gross Unrealized Gains   34,739 14,111
Gross Unrealized Losses   (26,728) (57,640)
Fair Value   2,607,029 2,892,761
Other than temporary impairment, pre-tax basis, credit portion recognized in earnings 99 99  
Other than temporary impairment, pre-tax basis, non-credit portion recognized in other comprehensive income   5,100  
U.S. Treasury securities
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   459,613 527,847
Gross Unrealized Gains   1,135 420
Gross Unrealized Losses   (71) (2,560)
Fair Value   460,677 525,707
U.S. Government agency and U.S. Government sponsored enterprise debt securities
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   197,264 411,135
Gross Unrealized Gains   673 577
Gross Unrealized Losses   (82) (8,651)
Fair Value   197,855 403,061
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   174,036 181,555
Gross Unrealized Gains   6,665 1,219
Gross Unrealized Losses   (36) (3,516)
Fair Value   180,665 179,258
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   1,123,880 981,949
Gross Unrealized Gains   20,883 9,451
Gross Unrealized Losses   (678) (13,450)
Fair Value   1,144,085 977,950
Municipal securities
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   163,333 265,214
Gross Unrealized Gains   4,491 1,202
Gross Unrealized Losses   (731) (16,410)
Fair Value   167,093 250,006
Other residential mortgage-backed securities: | Investment grade
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost     15,489
Gross Unrealized Losses     (797)
Fair Value     14,692
Other commercial mortgage-backed securities: | Investment grade
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   16,999 51,000
Gross Unrealized Gains   85 293
Fair Value   17,084 51,293
Corporate debt securities | Investment grade
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   429,318 471,407
Gross Unrealized Gains   237 913
Gross Unrealized Losses   (17,572) (6,392)
Fair Value   411,983 465,928
Corporate debt securities | Non-investment grade
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   24,620 [1] 20,679 [1]
Gross Unrealized Gains   355 [1] 36 [1]
Gross Unrealized Losses   (7,558) [1] (5,773) [1]
Fair Value   17,417 [1] 14,942 [1]
Other securities
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   9,955 10,015
Gross Unrealized Gains   215  
Gross Unrealized Losses     (91)
Fair Value   $ 10,170 $ 9,924
[1] For the nine months ended September 30, 2013, the Company did not record any OTTI. The Company recorded $99 thousand, on a pre-tax basis, of the credit portion of OTTI through earnings and $5.1 million of the non-credit portion of OTTI for pooled trust preferred securities in other comprehensive income for the year ended December 31, 2012.