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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, 2020
Dec. 31, 2019
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,839,578 $ 1,600,984
Securities Available for Sale, Gross Unrealized Gains 45,136 7,580
Securities Available for Sale, Gross Unrealized (Losses) (561) (6,160)
Securities Available for Sale, Estimated Fair Value 1,884,153 1,602,404
Securities Held to Maturity, Amortized Cost 660,048 738,099
Securities Held to Maturity, Gross Unrealized Gains 30,538 9,274
Securities Held to Maturity, Gross Unrealized (Losses) (25) (1,171)
Securities Held to Maturity, Estimated Fair Value 690,561 746,202
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 20,254 22,965
Securities Available for Sale, Gross Unrealized Gains 160 69
Securities Available for Sale, Gross Unrealized (Losses) (516) (707)
Securities Available for Sale, Estimated Fair Value 19,898 22,327
Securities Held to Maturity, Amortized Cost 0 3,781
Securities Held to Maturity, Gross Unrealized Gains 0 220
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 0 4,001
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 10,565 24,952
Securities Available for Sale, Gross Unrealized Gains 611 513
Securities Available for Sale, Gross Unrealized (Losses) 0 0
Securities Available for Sale, Estimated Fair Value 11,176 25,465
Securities Held to Maturity, Amortized Cost 31,629 31,781
Securities Held to Maturity, Gross Unrealized Gains 461 434
Securities Held to Maturity, Gross Unrealized (Losses) (25) (53)
Securities Held to Maturity, Estimated Fair Value 32,065 32,162
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 67,439 69,196
Securities Available for Sale, Gross Unrealized Gains 2,199 425
Securities Available for Sale, Gross Unrealized (Losses) (1) (369)
Securities Available for Sale, Estimated Fair Value 69,637 69,252
Securities Held to Maturity, Amortized Cost 10,306 10,820
Securities Held to Maturity, Gross Unrealized Gains 548 266
Securities Held to Maturity, Gross Unrealized (Losses) 0 (10)
Securities Held to Maturity, Estimated Fair Value 10,854 11,076
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 1,096,861 714,350
Securities Available for Sale, Gross Unrealized Gains 24,762 2,171
Securities Available for Sale, Gross Unrealized (Losses) (19) (3,165)
Securities Available for Sale, Estimated Fair Value 1,121,604 713,356
Securities Held to Maturity, Amortized Cost 86,346 96,631
Securities Held to Maturity, Gross Unrealized Gains 3,204 286
Securities Held to Maturity, Gross Unrealized (Losses) 0 (370)
Securities Held to Maturity, Estimated Fair Value 89,550 96,547
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 560,109 656,162
Securities Available for Sale, Gross Unrealized Gains 14,846 3,777
Securities Available for Sale, Gross Unrealized (Losses) (15) (1,713)
Securities Available for Sale, Estimated Fair Value 574,940 658,226
Securities Held to Maturity, Amortized Cost 435,333 485,324
Securities Held to Maturity, Gross Unrealized Gains 23,148 7,026
Securities Held to Maturity, Gross Unrealized (Losses) 0 (656)
Securities Held to Maturity, Estimated Fair Value 458,481 491,694
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 84,350 113,359
Securities Available for Sale, Gross Unrealized Gains 2,558 625
Securities Available for Sale, Gross Unrealized (Losses) (10) (206)
Securities Available for Sale, Estimated Fair Value 86,898 113,778
Securities Held to Maturity, Amortized Cost 96,434 109,762
Securities Held to Maturity, Gross Unrealized Gains 3,177 1,042
Securities Held to Maturity, Gross Unrealized (Losses) 0 (82)
Securities Held to Maturity, Estimated Fair Value $ 99,611 $ 110,722