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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
Jun. 30, 2019
Dec. 31, 2018
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,647,538 $ 1,854,529
Securities Available for Sale, Gross Unrealized Gains 6,019 841
Securities Available for Sale, Gross Unrealized (Losses) (9,832) (43,557)
Securities Available for Sale, Estimated Fair Value 1,643,725 1,811,813
Securities Held to Maturity, Amortized Cost 825,536 909,643
Securities Held to Maturity, Gross Unrealized Gains 8,947 909
Securities Held to Maturity, Gross Unrealized (Losses) (2,122) (20,819)
Securities Held to Maturity, Estimated Fair Value 832,361 889,733
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 27,334 31,235
Securities Available for Sale, Gross Unrealized Gains 102 109
Securities Available for Sale, Gross Unrealized (Losses) (790) (1,009)
Securities Available for Sale, Estimated Fair Value 26,646 30,335
Securities Held to Maturity, Amortized Cost 3,758 3,736
Securities Held to Maturity, Gross Unrealized Gains 242 78
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 4,000 3,814
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 38,203 50,503
Securities Available for Sale, Gross Unrealized Gains 495 200
Securities Available for Sale, Gross Unrealized (Losses) 0 (27)
Securities Available for Sale, Estimated Fair Value 38,698 50,676
Securities Held to Maturity, Amortized Cost 32,860 35,783
Securities Held to Maturity, Gross Unrealized Gains 478 255
Securities Held to Maturity, Gross Unrealized (Losses) (88) (139)
Securities Held to Maturity, Estimated Fair Value 33,250 35,899
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 66,041 69,648
Securities Available for Sale, Gross Unrealized Gains 314 147
Securities Available for Sale, Gross Unrealized (Losses) (639) (2,301)
Securities Available for Sale, Estimated Fair Value 65,716 67,494
Securities Held to Maturity, Amortized Cost 11,184 12,090
Securities Held to Maturity, Gross Unrealized Gains 189 45
Securities Held to Maturity, Gross Unrealized (Losses) (69) (257)
Securities Held to Maturity, Estimated Fair Value 11,304 11,878
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 628,799 685,520
Securities Available for Sale, Gross Unrealized Gains 941 127
Securities Available for Sale, Gross Unrealized (Losses) (5,376) (18,963)
Securities Available for Sale, Estimated Fair Value 624,364 666,684
Securities Held to Maturity, Amortized Cost 106,755 115,133
Securities Held to Maturity, Gross Unrealized Gains 379 43
Securities Held to Maturity, Gross Unrealized (Losses) (430) (2,887)
Securities Held to Maturity, Estimated Fair Value 106,704 112,289
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 750,605 830,129
Securities Available for Sale, Gross Unrealized Gains 3,484 67
Securities Available for Sale, Gross Unrealized (Losses) (2,718) (18,595)
Securities Available for Sale, Estimated Fair Value 751,371 811,601
Securities Held to Maturity, Amortized Cost 536,166 578,827
Securities Held to Maturity, Gross Unrealized Gains 6,505 189
Securities Held to Maturity, Gross Unrealized (Losses) (1,338) (15,441)
Securities Held to Maturity, Estimated Fair Value 541,333 563,575
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 136,556 187,494
Securities Available for Sale, Gross Unrealized Gains 683 191
Securities Available for Sale, Gross Unrealized (Losses) (309) (2,662)
Securities Available for Sale, Estimated Fair Value 136,930 185,023
Securities Held to Maturity, Amortized Cost 134,813 164,074
Securities Held to Maturity, Gross Unrealized Gains 1,154 299
Securities Held to Maturity, Gross Unrealized (Losses) (197) (2,095)
Securities Held to Maturity, Estimated Fair Value $ 135,770 $ 162,278