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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
Dec. 31, 2019
Dec. 31, 2018
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,600,984 $ 1,854,529
Securities Available for Sale, Gross Unrealized Gains 7,580 841
Securities Available for Sale, Gross Unrealized (Losses) (6,160) (43,557)
Securities Available for Sale, Estimated Fair Value 1,602,404 1,811,813
Securities Held to Maturity, Amortized Cost 738,099 909,643
Securities Held to Maturity, Gross Unrealized Gains 9,274 909
Securities Held to Maturity, Gross Unrealized (Losses) (1,171) (20,819)
Securities Held to Maturity, Estimated Fair Value 746,202 889,733
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 22,965 31,235
Securities Available for Sale, Gross Unrealized Gains 69 109
Securities Available for Sale, Gross Unrealized (Losses) (707) (1,009)
Securities Available for Sale, Estimated Fair Value 22,327 30,335
Securities Held to Maturity, Amortized Cost 3,781 3,736
Securities Held to Maturity, Gross Unrealized Gains 220 78
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 4,001 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 24,952 50,503
Securities Available for Sale, Gross Unrealized Gains 513 200
Securities Available for Sale, Gross Unrealized (Losses) 0 (27)
Securities Available for Sale, Estimated Fair Value 25,465 50,676
Securities Held to Maturity, Amortized Cost 31,781 35,783
Securities Held to Maturity, Gross Unrealized Gains 434 255
Securities Held to Maturity, Gross Unrealized (Losses) (53) (139)
Securities Held to Maturity, Estimated Fair Value 32,162 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 69,196 69,648
Securities Available for Sale, Gross Unrealized Gains 425 147
Securities Available for Sale, Gross Unrealized (Losses) (369) (2,301)
Securities Available for Sale, Estimated Fair Value 69,252 67,494
Securities Held to Maturity, Amortized Cost 10,820 12,090
Securities Held to Maturity, Gross Unrealized Gains 266 45
Securities Held to Maturity, Gross Unrealized (Losses) (10) (257)
Securities Held to Maturity, Estimated Fair Value 11,076 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 714,350 685,520
Securities Available for Sale, Gross Unrealized Gains 2,171 127
Securities Available for Sale, Gross Unrealized (Losses) (3,165) (18,963)
Securities Available for Sale, Estimated Fair Value 713,356 666,684
Securities Held to Maturity, Amortized Cost 96,631 115,133
Securities Held to Maturity, Gross Unrealized Gains 286 43
Securities Held to Maturity, Gross Unrealized (Losses) (370) (2,887)
Securities Held to Maturity, Estimated Fair Value 96,547 112,289
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 656,162 830,129
Securities Available for Sale, Gross Unrealized Gains 3,777 67
Securities Available for Sale, Gross Unrealized (Losses) (1,713) (18,595)
Securities Available for Sale, Estimated Fair Value 658,226 811,601
Securities Held to Maturity, Amortized Cost 485,324 578,827
Securities Held to Maturity, Gross Unrealized Gains 7,026 189
Securities Held to Maturity, Gross Unrealized (Losses) (656) (15,441)
Securities Held to Maturity, Estimated Fair Value 491,694 563,575
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 113,359 187,494
Securities Available for Sale, Gross Unrealized Gains 625 191
Securities Available for Sale, Gross Unrealized (Losses) (206) (2,662)
Securities Available for Sale, Estimated Fair Value 113,778 185,023
Securities Held to Maturity, Amortized Cost 109,762 164,074
Securities Held to Maturity, Gross Unrealized Gains 1,042 299
Securities Held to Maturity, Gross Unrealized (Losses) (82) (2,095)
Securities Held to Maturity, Estimated Fair Value $ 110,722 $ 162,278