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Securities Available for Sale and Held to Maturity - Amortized Cost and Estimated Fair Value of Available for Sale and Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 2,372,720 $ 2,339,562
Securities Available for Sale, Gross Unrealized Gains 40,078 20,164
Securities Available for Sale, Gross Unrealized (Losses) (1,851) (14,304)
Securities Available for Sale, Estimated Fair Value 2,410,947 2,345,422
Securities Held to Maturity, Amortized Cost 1,143,234 1,187,818
Securities Held to Maturity, Gross Unrealized Gains 30,039 13,504
Securities Held to Maturity, Gross Unrealized (Losses) (172) (5,955)
Securities Held to Maturity, Estimated Fair Value 1,173,101 1,195,367
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 58,259 68,314
Securities Available for Sale, Gross Unrealized Gains 482 555
Securities Available for Sale, Gross Unrealized (Losses) (507) (734)
Securities Available for Sale, Estimated Fair Value 58,234 68,135
Securities Held to Maturity, Amortized Cost 0 0
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 0 0
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]    
Securities Available for Sale, Amortized Cost 257 258
Securities Available for Sale, Gross Unrealized Gains 26 23
Securities Available for Sale, Gross Unrealized (Losses) 0 0
Securities Available for Sale, Estimated Fair Value 283 281
Securities Held to Maturity, Amortized Cost 3,636 101,782
Securities Held to Maturity, Gross Unrealized Gains 337 3,282
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 3,973 105,064
Obligations of States and Political Subdivisions [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 121,485 134,719
Securities Available for Sale, Gross Unrealized Gains 3,167 3,922
Securities Available for Sale, Gross Unrealized (Losses) (11) (32)
Securities Available for Sale, Estimated Fair Value 124,641 138,609
Securities Held to Maturity, Amortized Cost 52,937 55,892
Securities Held to Maturity, Gross Unrealized Gains 2,615 2,918
Securities Held to Maturity, Gross Unrealized (Losses) (4) 0
Securities Held to Maturity, Estimated Fair Value 55,548 58,810
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 36,130 25,602
Securities Available for Sale, Gross Unrealized Gains 712 399
Securities Available for Sale, Gross Unrealized (Losses) (54) (189)
Securities Available for Sale, Estimated Fair Value 36,788 25,812
Securities Held to Maturity, Amortized Cost 16,183 17,363
Securities Held to Maturity, Gross Unrealized Gains 666 342
Securities Held to Maturity, Gross Unrealized (Losses) 0 (49)
Securities Held to Maturity, Estimated Fair Value 16,849 17,656
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 554,916 222,899
Securities Available for Sale, Gross Unrealized Gains 7,239 2,956
Securities Available for Sale, Gross Unrealized (Losses) (166) (313)
Securities Available for Sale, Estimated Fair Value 561,989 225,542
Securities Held to Maturity, Amortized Cost 39,989 10,368
Securities Held to Maturity, Gross Unrealized Gains 810 311
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 40,799 10,679
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]    
Securities Available for Sale, Amortized Cost 1,353,984 1,584,338
Securities Available for Sale, Gross Unrealized Gains 21,507 9,541
Securities Available for Sale, Gross Unrealized (Losses) (1,092) (11,019)
Securities Available for Sale, Estimated Fair Value 1,374,399 1,582,860
Securities Held to Maturity, Amortized Cost 831,662 820,012
Securities Held to Maturity, Gross Unrealized Gains 18,690 4,951
Securities Held to Maturity, Gross Unrealized (Losses) (60) (4,742)
Securities Held to Maturity, Estimated Fair Value 850,292 820,221
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]    
Securities Available for Sale, Amortized Cost 247,689 278,429
Securities Available for Sale, Gross Unrealized Gains 6,945 2,689
Securities Available for Sale, Gross Unrealized (Losses) (21) (1,892)
Securities Available for Sale, Estimated Fair Value 254,613 279,226
Securities Held to Maturity, Amortized Cost 198,827 182,401
Securities Held to Maturity, Gross Unrealized Gains 6,921 1,700
Securities Held to Maturity, Gross Unrealized (Losses) (108) (1,164)
Securities Held to Maturity, Estimated Fair Value $ 205,640 182,937
Asset-Backed Securities and Structured Financial Products [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost   25,003
Securities Available for Sale, Gross Unrealized Gains   79
Securities Available for Sale, Gross Unrealized (Losses)   (125)
Securities Available for Sale, Estimated Fair Value   24,957
Securities Held to Maturity, Amortized Cost   0
Securities Held to Maturity, Gross Unrealized Gains   0
Securities Held to Maturity, Gross Unrealized (Losses)   0
Securities Held to Maturity, Estimated Fair Value   $ 0