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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, 2018
Dec. 31, 2017
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,935,102 $ 2,262,130
Securities Available for Sale, Gross Unrealized Gains 810 4,448
Securities Available for Sale, Gross Unrealized (Losses) (71,279) (27,943)
Securities Available for Sale, Estimated Fair Value 1,864,633 2,238,635
Securities Held to Maturity, Amortized Cost 943,883 1,056,486
Securities Held to Maturity, Gross Unrealized Gains 276 3,954
Securities Held to Maturity, Gross Unrealized (Losses) (36,842) (14,193)
Securities Held to Maturity, Estimated Fair Value 907,317 1,046,247
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 33,511 45,763
Securities Available for Sale, Gross Unrealized Gains 126 322
Securities Available for Sale, Gross Unrealized (Losses) (1,266) (800)
Securities Available for Sale, Estimated Fair Value 32,371 45,285
Securities Held to Maturity, Amortized Cost 3,725 3,692
Securities Held to Maturity, Gross Unrealized Gains 26 182
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 3,751 3,874
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 57,127 78,433
Securities Available for Sale, Gross Unrealized Gains 201 850
Securities Available for Sale, Gross Unrealized (Losses) (64) (54)
Securities Available for Sale, Estimated Fair Value 57,264 79,229
Securities Held to Maturity, Amortized Cost 42,623 46,039
Securities Held to Maturity, Gross Unrealized Gains 173 1,044
Securities Held to Maturity, Gross Unrealized (Losses) (156) (59)
Securities Held to Maturity, Estimated Fair Value 42,640 47,024
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 68,844 66,634
Securities Available for Sale, Gross Unrealized Gains 118 215
Securities Available for Sale, Gross Unrealized (Losses) (3,115) (1,103)
Securities Available for Sale, Estimated Fair Value 65,847 65,746
Securities Held to Maturity, Amortized Cost 12,316 13,539
Securities Held to Maturity, Gross Unrealized Gains 33 207
Securities Held to Maturity, Gross Unrealized (Losses) (389) (73)
Securities Held to Maturity, Estimated Fair Value 11,960 13,673
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 713,673 824,872
Securities Available for Sale, Gross Unrealized Gains 125 827
Securities Available for Sale, Gross Unrealized (Losses) (29,324) (11,249)
Securities Available for Sale, Estimated Fair Value 684,474 814,450
Securities Held to Maturity, Amortized Cost 119,040 133,975
Securities Held to Maturity, Gross Unrealized Gains 3 210
Securities Held to Maturity, Gross Unrealized (Losses) (4,652) (1,559)
Securities Held to Maturity, Estimated Fair Value 114,391 132,626
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 872,699 1,028,176
Securities Available for Sale, Gross Unrealized Gains 86 1,808
Securities Available for Sale, Gross Unrealized (Losses) (32,712) (13,194)
Securities Available for Sale, Estimated Fair Value 840,073 1,016,790
Securities Held to Maturity, Amortized Cost 600,635 678,926
Securities Held to Maturity, Gross Unrealized Gains 0 1,209
Securities Held to Maturity, Gross Unrealized (Losses) (27,473) (11,065)
Securities Held to Maturity, Estimated Fair Value 573,162 669,070
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 189,248 218,252
Securities Available for Sale, Gross Unrealized Gains 154 426
Securities Available for Sale, Gross Unrealized (Losses) (4,798) (1,543)
Securities Available for Sale, Estimated Fair Value 184,604 217,135
Securities Held to Maturity, Amortized Cost 165,544 180,315
Securities Held to Maturity, Gross Unrealized Gains 41 1,102
Securities Held to Maturity, Gross Unrealized (Losses) (4,172) (1,437)
Securities Held to Maturity, Estimated Fair Value $ 161,413 $ 179,980