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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
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 2,372,755 $ 2,366,168
Securities Available for Sale, Gross Unrealized Gains 11,108 12,124
Securities Available for Sale, Gross Unrealized (Losses) (18,309) (21,610)
Securities Available for Sale, Estimated Fair Value 2,365,554 2,356,682
Securities Held to Maturity, Amortized Cost 1,156,067 1,158,643
Securities Held to Maturity, Gross Unrealized Gains 6,748 7,300
Securities Held to Maturity, Gross Unrealized (Losses) (8,400) (8,897)
Securities Held to Maturity, Estimated Fair Value 1,154,415 1,157,046
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 53,700 56,272
Securities Available for Sale, Gross Unrealized Gains 376 416
Securities Available for Sale, Gross Unrealized (Losses) (829) (925)
Securities Available for Sale, Estimated Fair Value 53,247 55,763
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 256 257
Securities Available for Sale, Gross Unrealized Gains 18 19
Securities Available for Sale, Gross Unrealized (Losses) 0 0
Securities Available for Sale, Estimated Fair Value 274 276
Securities Held to Maturity, Amortized Cost 3,658 3,647
Securities Held to Maturity, Gross Unrealized Gains 223 355
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 3,881 4,002
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 107,930 113,541
Securities Available for Sale, Gross Unrealized Gains 2,001 1,945
Securities Available for Sale, Gross Unrealized (Losses) (36) (113)
Securities Available for Sale, Estimated Fair Value 109,895 115,373
Securities Held to Maturity, Amortized Cost 46,273 46,303
Securities Held to Maturity, Gross Unrealized Gains 1,619 1,476
Securities Held to Maturity, Gross Unrealized (Losses) (12) (27)
Securities Held to Maturity, Estimated Fair Value 47,880 47,752
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 43,281 43,222
Securities Available for Sale, Gross Unrealized Gains 286 340
Securities Available for Sale, Gross Unrealized (Losses) (900) (776)
Securities Available for Sale, Estimated Fair Value 42,667 42,786
Securities Held to Maturity, Amortized Cost 14,977 15,478
Securities Held to Maturity, Gross Unrealized Gains 261 280
Securities Held to Maturity, Gross Unrealized (Losses) (66) (52)
Securities Held to Maturity, Estimated Fair Value 15,172 15,706
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 738,408 638,809
Securities Available for Sale, Gross Unrealized Gains 1,877 1,773
Securities Available for Sale, Gross Unrealized (Losses) (7,071) (9,498)
Securities Available for Sale, Estimated Fair Value 733,214 631,084
Securities Held to Maturity, Amortized Cost 118,733 81,299
Securities Held to Maturity, Gross Unrealized Gains 264 223
Securities Held to Maturity, Gross Unrealized (Losses) (936) (1,084)
Securities Held to Maturity, Estimated Fair Value 118,061 80,438
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 1,205,842 1,271,198
Securities Available for Sale, Gross Unrealized Gains 5,353 5,865
Securities Available for Sale, Gross Unrealized (Losses) (8,476) (9,112)
Securities Available for Sale, Estimated Fair Value 1,202,719 1,267,951
Securities Held to Maturity, Amortized Cost 771,296 803,474
Securities Held to Maturity, Gross Unrealized Gains 2,961 3,208
Securities Held to Maturity, Gross Unrealized (Losses) (6,271) (6,519)
Securities Held to Maturity, Estimated Fair Value 767,986 800,163
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 223,338 242,869
Securities Available for Sale, Gross Unrealized Gains 1,197 1,766
Securities Available for Sale, Gross Unrealized (Losses) (997) (1,186)
Securities Available for Sale, Estimated Fair Value 223,538 243,449
Securities Held to Maturity, Amortized Cost 201,130 208,442
Securities Held to Maturity, Gross Unrealized Gains 1,420 1,758
Securities Held to Maturity, Gross Unrealized (Losses) (1,115) (1,215)
Securities Held to Maturity, Estimated Fair Value $ 201,435 $ 208,985