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Securities Available for Sale and Held to Maturity - Securities with Gross Unrealized Losses, Segregated by Length of Impairment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months $ 1,506,669 $ 590,965
Estimated Fair Value, 12 Months or More 284,538 522,230
Estimated Fair Value, Total 1,791,207 1,113,195
Gross Unrealized (Losses), Less than 12 Months (12,487) (2,663)
Gross Unrealized (Losses), 12 Months or More (7,772) (11,909)
Gross Unrealized (Losses), Total (20,259) (14,572)
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 18,924 19,220
Estimated Fair Value, 12 Months or More 30,591 32,656
Estimated Fair Value, Total 49,515 51,876
Gross Unrealized (Losses), Less than 12 Months (81) (115)
Gross Unrealized (Losses), 12 Months or More (653) (711)
Gross Unrealized (Losses), Total (734) (826)
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months   9,948
Estimated Fair Value, 12 Months or More   9,956
Estimated Fair Value, Total   19,904
Gross Unrealized (Losses), Less than 12 Months   (52)
Gross Unrealized (Losses), 12 Months or More   (25)
Gross Unrealized (Losses), Total   (77)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 4,289 8,431
Estimated Fair Value, 12 Months or More 2,842 3,800
Estimated Fair Value, Total 7,131 12,231
Gross Unrealized (Losses), Less than 12 Months (12) (22)
Gross Unrealized (Losses), 12 Months or More (20) (46)
Gross Unrealized (Losses), Total (32) (68)
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 20,300 7,199
Estimated Fair Value, 12 Months or More 1,863 647
Estimated Fair Value, Total 22,163 7,846
Gross Unrealized (Losses), Less than 12 Months (222) (22)
Gross Unrealized (Losses), 12 Months or More (16) (8)
Gross Unrealized (Losses), Total (238) (30)
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 82,177  
Estimated Fair Value, 12 Months or More 0  
Estimated Fair Value, Total 82,177  
Gross Unrealized (Losses), Less than 12 Months (313)  
Gross Unrealized (Losses), 12 Months or More 0  
Gross Unrealized (Losses), Total (313)  
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 1,135,533 537,033
Estimated Fair Value, 12 Months or More 238,152 395,342
Estimated Fair Value, Total 1,373,685 932,375
Gross Unrealized (Losses), Less than 12 Months (8,832) (2,449)
Gross Unrealized (Losses), 12 Months or More (6,929) (10,031)
Gross Unrealized (Losses), Total (15,761) (12,480)
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 238,668 9,134
Estimated Fair Value, 12 Months or More 11,090 79,829
Estimated Fair Value, Total 249,758 88,963
Gross Unrealized (Losses), Less than 12 Months (2,902) (3)
Gross Unrealized (Losses), 12 Months or More (154) (1,088)
Gross Unrealized (Losses), Total (3,056) $ (1,091)
Asset-Backed Securities and Structured Financial Products [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 6,778  
Estimated Fair Value, 12 Months or More 0  
Estimated Fair Value, Total 6,778  
Gross Unrealized (Losses), Less than 12 Months (125)  
Gross Unrealized (Losses), 12 Months or More 0  
Gross Unrealized (Losses), Total $ (125)