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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, 2019
Dec. 31, 2018
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,553,364 $ 1,854,529
Securities Available for Sale, Gross Unrealized Gains 7,324 841
Securities Available for Sale, Gross Unrealized (Losses) (6,983) (43,557)
Securities Available for Sale, Estimated Fair Value 1,553,705 1,811,813
Securities Held to Maturity, Amortized Cost 785,422 909,643
Securities Held to Maturity, Gross Unrealized Gains 10,452 909
Securities Held to Maturity, Gross Unrealized (Losses) (1,189) (20,819)
Securities Held to Maturity, Estimated Fair Value 794,685 889,733
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 25,359 31,235
Securities Available for Sale, Gross Unrealized Gains 75 109
Securities Available for Sale, Gross Unrealized (Losses) (737) (1,009)
Securities Available for Sale, Estimated Fair Value 24,697 30,335
Securities Held to Maturity, Amortized Cost 3,770 3,736
Securities Held to Maturity, Gross Unrealized Gains 232 78
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 4,002 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 34,463 50,503
Securities Available for Sale, Gross Unrealized Gains 538 200
Securities Available for Sale, Gross Unrealized (Losses) 0 (27)
Securities Available for Sale, Estimated Fair Value 35,001 50,676
Securities Held to Maturity, Amortized Cost 31,806 35,783
Securities Held to Maturity, Gross Unrealized Gains 446 255
Securities Held to Maturity, Gross Unrealized (Losses) (66) (139)
Securities Held to Maturity, Estimated Fair Value 32,186 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 63,143 69,648
Securities Available for Sale, Gross Unrealized Gains 551 147
Securities Available for Sale, Gross Unrealized (Losses) (303) (2,301)
Securities Available for Sale, Estimated Fair Value 63,391 67,494
Securities Held to Maturity, Amortized Cost 10,994 12,090
Securities Held to Maturity, Gross Unrealized Gains 302 45
Securities Held to Maturity, Gross Unrealized (Losses) (5) (257)
Securities Held to Maturity, Estimated Fair Value 11,291 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 593,049 685,520
Securities Available for Sale, Gross Unrealized Gains 1,137 127
Securities Available for Sale, Gross Unrealized (Losses) (4,224) (18,963)
Securities Available for Sale, Estimated Fair Value 589,962 666,684
Securities Held to Maturity, Amortized Cost 102,048 115,133
Securities Held to Maturity, Gross Unrealized Gains 465 43
Securities Held to Maturity, Gross Unrealized (Losses) (335) (2,887)
Securities Held to Maturity, Estimated Fair Value 102,178 112,289
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 703,162 830,129
Securities Available for Sale, Gross Unrealized Gains 3,935 67
Securities Available for Sale, Gross Unrealized (Losses) (1,496) (18,595)
Securities Available for Sale, Estimated Fair Value 705,601 811,601
Securities Held to Maturity, Amortized Cost 510,770 578,827
Securities Held to Maturity, Gross Unrealized Gains 7,499 189
Securities Held to Maturity, Gross Unrealized (Losses) (731) (15,441)
Securities Held to Maturity, Estimated Fair Value 517,538 563,575
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 134,188 187,494
Securities Available for Sale, Gross Unrealized Gains 1,088 191
Securities Available for Sale, Gross Unrealized (Losses) (223) (2,662)
Securities Available for Sale, Estimated Fair Value 135,053 185,023
Securities Held to Maturity, Amortized Cost 126,034 164,074
Securities Held to Maturity, Gross Unrealized Gains 1,508 299
Securities Held to Maturity, Gross Unrealized (Losses) (52) (2,095)
Securities Held to Maturity, Estimated Fair Value $ 127,490 $ 162,278