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INVESTMENTS IN DEBT AND EQUITY SECURITIES (Securities Available for Sale) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Carrying value: Maturity, 1 Year or Less $ 11,400 $ 1,310
Carrying value: Maturity, 1-5 Years 245,011 361,446
Carrying value: Maturity, 5-10 Years 269,997 238,020
Carrying value: Maturity, After 10 Years 1,466,809 1,827,209
Carrying value: Total Amortized Cost 1,993,217 2,427,985
Carrying value: Gross Unrealized Gains 51,774 39,350
Carrying value: Gross Unrealized Losses (1,264) (9,448)
Carrying value: Fair Value 2,043,727 2,457,887
Carrying value: Weighted Average Yield 2.26% 2.28%
Fair Value: Maturity, 1 Year or Less 11,476 1,314
Fair value: Maturity, 1-5 Years 251,558 357,194
Fair value: Maturity, 5-10 Years 275,251 236,824
Fair value: Maturity, After 10 Years 1,505,442 1,862,555
Weighted average yield, Maturity, 1 Year or Less 2.01% 2.93%
Weighted average yield, Maturity, 1-5 Years 2.17% 2.07%
Weighted average yield, Maturity, 5-10 Years 2.65% 2.56%
Weighted average yield, Maturity, After 10 Years 2.21% 2.28%
U.S. Government sponsored agencies
   
Schedule of Available-for-sale Securities [Line Items]    
Carrying value: Maturity, 1 Year or Less 10,051 1,000
Carrying value: Maturity, 1-5 Years 80,328 231,691
Carrying value: Maturity, 5-10 Years 0 107,019
Carrying value: Maturity, After 10 Years 213,892 0
Carrying value: Total Amortized Cost 304,271 339,710
Carrying value: Gross Unrealized Gains 6,304 2,107
Carrying value: Gross Unrealized Losses (146) 0
Carrying value: Fair Value 310,429 341,817
Carrying value: Weighted Average Yield 1.42% 1.75%
Residential mortgage-backed
   
Schedule of Available-for-sale Securities [Line Items]    
Carrying value: Maturity, 1 Year or Less 364 0
Carrying value: Maturity, 1-5 Years 24,014 2,726
Carrying value: Maturity, 5-10 Years 219,286 64,309
Carrying value: Maturity, After 10 Years 1,251,917 1,821,209
Carrying value: Total Amortized Cost 1,495,581 1,888,244
Carrying value: Gross Unrealized Gains 38,983 36,908
Carrying value: Gross Unrealized Losses (497) (232)
Carrying value: Fair Value 1,534,067 1,924,920
Carrying value: Weighted Average Yield 2.32% 2.27%
Commercial mortgage-backed
   
Schedule of Available-for-sale Securities [Line Items]    
Carrying value: Maturity, 1 Year or Less 0 0
Carrying value: Maturity, 1-5 Years 0 0
Carrying value: Maturity, 5-10 Years 806 818
Carrying value: Maturity, After 10 Years 0 0
Carrying value: Total Amortized Cost 806 818
Carrying value: Gross Unrealized Gains 109 92
Carrying value: Gross Unrealized Losses 0 0
Carrying value: Fair Value 915 910
Carrying value: Weighted Average Yield 4.86% 4.86%
State and political subdivisions
   
Schedule of Available-for-sale Securities [Line Items]    
Carrying value: Maturity, 1 Year or Less 985 310
Carrying value: Maturity, 1-5 Years 3,579 4,088
Carrying value: Maturity, 5-10 Years 201 786
Carrying value: Maturity, After 10 Years 0 0
Carrying value: Total Amortized Cost 4,765 5,184
Carrying value: Gross Unrealized Gains 164 226
Carrying value: Gross Unrealized Losses 0 0
Carrying value: Fair Value 4,929 5,410
Carrying value: Weighted Average Yield 4.05% 4.00%
Corporate notes
   
Schedule of Available-for-sale Securities [Line Items]    
Carrying value: Maturity, 1 Year or Less 0 0
Carrying value: Maturity, 1-5 Years 137,090 122,941
Carrying value: Maturity, 5-10 Years 49,704 65,088
Carrying value: Maturity, After 10 Years 0 5,000
Carrying value: Total Amortized Cost 186,794 193,029
Carrying value: Gross Unrealized Gains 6,192 0
Carrying value: Gross Unrealized Losses (621) (9,216)
Carrying value: Fair Value 192,365 183,813
Carrying value: Weighted Average Yield 3.13% 3.28%
Equity investments
   
Schedule of Available-for-sale Securities [Line Items]    
Carrying value: Maturity, 1 Year or Less 0 0
Carrying value: Maturity, 1-5 Years 0 0
Carrying value: Maturity, 5-10 Years 0 0
Carrying value: Maturity, After 10 Years 1,000 1,000
Carrying value: Total Amortized Cost 1,000 1,000
Carrying value: Gross Unrealized Gains 22 17
Carrying value: Gross Unrealized Losses 0 0
Carrying value: Fair Value 1,022 1,017
Carrying value: Weighted Average Yield 2.54% 2.83%
Debt securities
   
Schedule of Available-for-sale Securities [Line Items]    
Fair Value: Maturity, 1 Year or Less 11,476 1,314
Fair value: Maturity, 1-5 Years 251,558 357,194
Fair value: Maturity, 5-10 Years 275,251 236,824
Fair value: Maturity, After 10 Years 1,504,420 1,861,538
Equity securities
   
Schedule of Available-for-sale Securities [Line Items]    
Fair Value: Maturity, 1 Year or Less 0 0
Fair value: Maturity, 1-5 Years 0 0
Fair value: Maturity, 5-10 Years 0 0
Fair value: Maturity, After 10 Years $ 1,022 $ 1,017