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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, 2019
Dec. 31, 2018
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,747,337 $ 1,854,529
Securities Available for Sale, Gross Unrealized Gains 1,650 841
Securities Available for Sale, Gross Unrealized (Losses) (25,542) (43,557)
Securities Available for Sale, Estimated Fair Value 1,723,445 1,811,813
Securities Held to Maturity, Amortized Cost 884,319 909,643
Securities Held to Maturity, Gross Unrealized Gains 2,224 909
Securities Held to Maturity, Gross Unrealized (Losses) (11,685) (20,819)
Securities Held to Maturity, Estimated Fair Value 874,858 889,733
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 28,900 31,235
Securities Available for Sale, Gross Unrealized Gains 101 109
Securities Available for Sale, Gross Unrealized (Losses) (993) (1,009)
Securities Available for Sale, Estimated Fair Value 28,008 30,335
Securities Held to Maturity, Amortized Cost 3,747 3,736
Securities Held to Maturity, Gross Unrealized Gains 129 78
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 3,876 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 50,660 50,503
Securities Available for Sale, Gross Unrealized Gains 303 200
Securities Available for Sale, Gross Unrealized (Losses) (9) (27)
Securities Available for Sale, Estimated Fair Value 50,954 50,676
Securities Held to Maturity, Amortized Cost 35,352 35,783
Securities Held to Maturity, Gross Unrealized Gains 386 255
Securities Held to Maturity, Gross Unrealized (Losses) (141) (139)
Securities Held to Maturity, Estimated Fair Value 35,597 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 67,345 69,648
Securities Available for Sale, Gross Unrealized Gains 186 147
Securities Available for Sale, Gross Unrealized (Losses) (1,355) (2,301)
Securities Available for Sale, Estimated Fair Value 66,176 67,494
Securities Held to Maturity, Amortized Cost 11,710 12,090
Securities Held to Maturity, Gross Unrealized Gains 102 45
Securities Held to Maturity, Gross Unrealized (Losses) (128) (257)
Securities Held to Maturity, Estimated Fair Value 11,684 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 656,926 685,520
Securities Available for Sale, Gross Unrealized Gains 418 127
Securities Available for Sale, Gross Unrealized (Losses) (11,386) (18,963)
Securities Available for Sale, Estimated Fair Value 645,958 666,684
Securities Held to Maturity, Amortized Cost 111,962 115,133
Securities Held to Maturity, Gross Unrealized Gains 130 43
Securities Held to Maturity, Gross Unrealized (Losses) (1,834) (2,887)
Securities Held to Maturity, Estimated Fair Value 110,258 112,289
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 794,838 830,129
Securities Available for Sale, Gross Unrealized Gains 388 67
Securities Available for Sale, Gross Unrealized (Losses) (10,660) (18,595)
Securities Available for Sale, Estimated Fair Value 784,566 811,601
Securities Held to Maturity, Amortized Cost 559,690 578,827
Securities Held to Maturity, Gross Unrealized Gains 777 189
Securities Held to Maturity, Gross Unrealized (Losses) (8,405) (15,441)
Securities Held to Maturity, Estimated Fair Value 552,062 563,575
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 148,668 187,494
Securities Available for Sale, Gross Unrealized Gains 254 191
Securities Available for Sale, Gross Unrealized (Losses) (1,139) (2,662)
Securities Available for Sale, Estimated Fair Value 147,783 185,023
Securities Held to Maturity, Amortized Cost 161,858 164,074
Securities Held to Maturity, Gross Unrealized Gains 700 299
Securities Held to Maturity, Gross Unrealized (Losses) (1,177) (2,095)
Securities Held to Maturity, Estimated Fair Value $ 161,381 $ 162,278