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Securities Available for Sale and Held to Maturity (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Available for sale securities [Abstract]      
Amortized cost $ 2,526,085   $ 2,395,263
Gross unrealized gains 71,857   73,918
Gross unrealized (losses) (2,278)   (188)
Estimated fair value 2,595,664   2,468,993
Held to maturity securities [Abstract]      
Amortized cost 52,010   57,705
Gross unrealized gains 4,705   4,813
Gross unrealized (losses) (2)   (3)
Estimated fair value 56,713   62,515
Fair value [Abstract]      
Estimated fair value, less than 12 months 205,671   51,327
Estimated fair value, 12 months or more 203   202
Total estimated fair value 205,874   51,529
Gross unrealized losses [Abstract]      
Gross unrealized (losses), less than 12 months (2,279)   (189)
Gross unrealized (losses), 12 months or more (1)   (2)
Total gross unrealized (losses) (2,280)   (191)
Gains (losses) on investments [Abstract]      
Gross realized gains 1,050 7  
Available for Sale, amortized cost [Abstract]      
Due in one year or less 10,880    
Due after one year through five years 63,795    
Due after five years through ten years 216,903    
Due after ten years 37,216    
Total amortized cost, before mortgage-backed-securities 328,794    
Mortgage-backed securities 2,197,291    
Total amortized cost 2,526,085    
Available for Sale, estimated fair value [Abstract]      
Due in one year or less 10,941    
Due after one year through five years 66,501    
Due after five years through ten years 224,063    
Due after ten years 37,688    
Total fair value, before mortgage-backed-securities 339,193    
Mortgage-backed securities 2,256,471    
Securities available for sale (at fair value) 2,595,664   2,468,993
Held to maturity, amortized cost [Abstract]      
Due in one year or less 2,942    
Due after one year through five years 17,725    
Due after five years through ten years 18,230    
Due after ten years 1,496    
Total amortized cost, before mortgage-backed-securities 40,393    
Mortgage-backed securities 11,617    
Securities held to maturity 52,010   57,705
Held to maturity, estimated fair value [Abstract]      
Due in one year or less 2,969    
Due after one year through five years 19,290    
Due after five years through ten years 20,679    
Due after ten years 1,586    
Total fair value, before mortgage-backed-securities 44,524    
Mortgage-backed securities 12,189    
Securities held to maturity (at fair value) 56,713    
Available-for-sale Securities [Member]
     
Gains (losses) on investments [Abstract]      
Proceeds from calls and sales of securities 0 0  
Gross realized gains 1,050 0  
Held-to-maturity Securities [Member]
     
Gains (losses) on investments [Abstract]      
Proceeds from calls of securities 0 1,290  
Gross realized gains 0 7  
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
     
Held to maturity securities [Abstract]      
Amortized cost 0   0
Gross unrealized gains 0   0
Gross unrealized (losses) 0   0
Estimated fair value 0   0
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
     
Held to maturity securities [Abstract]      
Amortized cost 0   0
Gross unrealized gains 0   0
Gross unrealized (losses) 0   0
Estimated fair value 0   0
Fair value [Abstract]      
Estimated fair value, less than 12 months 71,545    
Estimated fair value, 12 months or more 0    
Total estimated fair value 71,545    
Gross unrealized losses [Abstract]      
Gross unrealized (losses), less than 12 months (688)    
Gross unrealized (losses), 12 months or more 0    
Total gross unrealized (losses) (688)    
Obligations of States and Political Subdivisions [Member]
     
Held to maturity securities [Abstract]      
Amortized cost 40,393   42,619
Gross unrealized gains 4,133   4,131
Gross unrealized (losses) (2)   (2)
Estimated fair value 44,524   46,748
Fair value [Abstract]      
Estimated fair value, less than 12 months 10,871   3,368
Estimated fair value, 12 months or more 203   202
Total estimated fair value 11,074   3,570
Gross unrealized losses [Abstract]      
Gross unrealized (losses), less than 12 months (158)   (12)
Gross unrealized (losses), 12 months or more (1)   (2)
Total gross unrealized (losses) (159)   (14)
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
     
Held to maturity securities [Abstract]      
Amortized cost 4,089   4,538
Gross unrealized gains 295   336
Gross unrealized (losses) 0   0
Estimated fair value 4,384   4,874
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
     
Held to maturity securities [Abstract]      
Amortized cost 586   588
Gross unrealized gains 29   28
Gross unrealized (losses) 0   0
Estimated fair value 615   616
Fair value [Abstract]      
Estimated fair value, less than 12 months 1,916    
Estimated fair value, 12 months or more 0    
Total estimated fair value 1,916    
Gross unrealized losses [Abstract]      
Gross unrealized (losses), less than 12 months (23)    
Gross unrealized (losses), 12 months or more 0    
Total gross unrealized (losses) (23)    
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
     
Held to maturity securities [Abstract]      
Amortized cost 4,743   7,749
Gross unrealized gains 83   133
Gross unrealized (losses) 0   (1)
Estimated fair value 4,826   7,881
Fair value [Abstract]      
Estimated fair value, less than 12 months 118,848   1,069
Estimated fair value, 12 months or more 0   0
Total estimated fair value 118,848   1,069
Gross unrealized losses [Abstract]      
Gross unrealized (losses), less than 12 months (1,382)   (1)
Gross unrealized (losses), 12 months or more 0   0
Total gross unrealized (losses) (1,382)   (1)
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
     
Held to maturity securities [Abstract]      
Amortized cost 2,199   2,211
Gross unrealized gains 165   185
Gross unrealized (losses) 0   0
Estimated fair value 2,364   2,396
Fair value [Abstract]      
Estimated fair value, less than 12 months     46,890
Estimated fair value, 12 months or more     0
Total estimated fair value     46,890
Gross unrealized losses [Abstract]      
Gross unrealized (losses), less than 12 months     (176)
Gross unrealized (losses), 12 months or more     0
Total gross unrealized (losses)     (176)
Asset-backed Securities [Member]
     
Available for sale securities [Abstract]      
Amortized cost 23,670    
Gross unrealized gains 23    
Gross unrealized (losses) 0    
Estimated fair value 23,693    
Held to maturity securities [Abstract]      
Amortized cost 0    
Gross unrealized gains 0    
Gross unrealized (losses) 0    
Estimated fair value 0    
Corporate Debt Securities [Member]
     
Available for sale securities [Abstract]      
Amortized cost 5,292    
Gross unrealized gains 30    
Gross unrealized (losses) (28)    
Estimated fair value 5,294    
Held to maturity securities [Abstract]      
Amortized cost 0    
Gross unrealized gains 0    
Gross unrealized (losses) 0    
Estimated fair value 0    
Fair value [Abstract]      
Estimated fair value, less than 12 months 2,491    
Estimated fair value, 12 months or more 0    
Total estimated fair value 2,491    
Gross unrealized losses [Abstract]      
Gross unrealized (losses), less than 12 months (28)    
Gross unrealized (losses), 12 months or more 0    
Total gross unrealized (losses) (28)    
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
     
Available for sale securities [Abstract]      
Amortized cost 31   3
Gross unrealized gains 0   0
Gross unrealized (losses) 0   0
Estimated fair value 31   3
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
     
Available for sale securities [Abstract]      
Amortized cost 102,489   64,573
Gross unrealized gains 140   229
Gross unrealized (losses) (688)   0
Estimated fair value 101,941   64,802
Obligations of States and Political Subdivisions [Member]
     
Available for sale securities [Abstract]      
Amortized cost 197,312   190,868
Gross unrealized gains 11,079   11,971
Gross unrealized (losses) (157)   (12)
Estimated fair value 208,234   202,827
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
     
Available for sale securities [Abstract]      
Amortized cost 19,108   11,500
Gross unrealized gains 956   945
Gross unrealized (losses) 0   0
Estimated fair value 20,064   12,445
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
     
Available for sale securities [Abstract]      
Amortized cost 279,597   340,839
Gross unrealized gains 6,595   7,093
Gross unrealized (losses) (23)   0
Estimated fair value 286,169   347,932
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
     
Available for sale securities [Abstract]      
Amortized cost 1,576,899   1,570,782
Gross unrealized gains 43,021   44,183
Gross unrealized (losses) 0   0
Estimated fair value 1,619,920   1,614,965
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
     
Available for sale securities [Abstract]      
Amortized cost 321,687   216,698
Gross unrealized gains 10,013   9,497
Gross unrealized (losses) (1,382)   (176)
Estimated fair value $ 330,318   $ 226,019