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INVESTMENT SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   $ 2,599,018 $ 2,704,652
Gross Unrealized Gains   34,739 14,804
Gross Unrealized Losses   (26,728) (52,284)
Fair Value   2,607,029 2,667,172
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   459,613 519,653
Gross Unrealized Gains   1,135 72
Gross Unrealized Losses   (71) (3,963)
Fair Value   460,677 515,762
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   197,264 256,996
Gross Unrealized Gains   673 249
Gross Unrealized Losses   (82) (6,990)
Fair Value   197,855 250,255
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   174,036 136,700
Gross Unrealized Gains   6,665 693
Gross Unrealized Losses   (36) (3,145)
Fair Value   180,665 134,248
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   1,123,880 997,211
Gross Unrealized Gains   20,883 10,586
Gross Unrealized Losses   (678) (11,280)
Fair Value   1,144,085 996,517
Municipal securities
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   163,333 242,615
Gross Unrealized Gains   4,491 1,082
Gross Unrealized Losses   (731) (14,424)
Fair Value   167,093 229,273
Other residential mortgage-backed securities: | Investment grade
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost     15,980
Gross Unrealized Losses     (778)
Fair Value     15,202
Other commercial mortgage-backed securities: | Investment grade
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   16,999 50,999
Gross Unrealized Gains   85 298
Fair Value   17,084 51,297
Corporate debt securities | Investment grade
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   429,318 451,688
Gross Unrealized Gains   237 1,752
Gross Unrealized Losses   (17,572) (5,229)
Fair Value   411,983 448,211
Corporate debt securities | Non-investment grade
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   24,620 [1] 22,020 [1]
Gross Unrealized Gains   355 [1] 63 [1]
Gross Unrealized Losses   (7,558) [1] (6,443) [1]
Fair Value   17,417 [1] 15,640 [1]
Other securities
     
Schedule of Available-for-sale Securities      
Investment securities available-for-sale, amortized cost   9,955 10,790
Gross Unrealized Gains   215 9
Gross Unrealized Losses     (32)
Fair Value   $ 10,170 $ 10,767
[1] For the six months ended June 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.