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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, 2023
Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,959,007 $ 2,270,709
Securities Available for Sale, Gross Unrealized Gains 37 380
Securities Available for Sale, Gross Unrealized (Losses) (196,166) (247,007)
Securities Available for Sale, Estimated Fair Value 1,762,878 2,024,082
Securities Held to Maturity, Amortized Cost 1,426,279 1,494,514
Securities Held to Maturity, Gross Unrealized Gains 51 37
Securities Held to Maturity, Gross Unrealized (Losses) (70,826) (87,962)
Securities Held to Maturity, Estimated Fair Value 1,355,504 1,406,589
U.S. Treasury Securities [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 396,179 425,719
Securities Available for Sale, Gross Unrealized Gains 0 308
Securities Available for Sale, Gross Unrealized (Losses) (23,811) (34,514)
Securities Available for Sale, Estimated Fair Value 372,368 391,513
Securities Held to Maturity, Amortized Cost 29,068 28,295
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (26) (115)
Securities Held to Maturity, Estimated Fair Value 29,042 28,180
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 6,207 8,297
Securities Available for Sale, Gross Unrealized Gains 1 0
Securities Available for Sale, Gross Unrealized (Losses) (416) (531)
Securities Available for Sale, Estimated Fair Value 5,792 7,766
Securities Held to Maturity, Amortized Cost 0 0
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 0 0
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 0 4,820
Securities Available for Sale, Gross Unrealized Gains 0 53
Securities Available for Sale, Gross Unrealized (Losses) 0 (11)
Securities Available for Sale, Estimated Fair Value 0 4,862
Securities Held to Maturity, Amortized Cost 340 4,510
Securities Held to Maturity, Gross Unrealized Gains 0 3
Securities Held to Maturity, Gross Unrealized (Losses) 0 (3)
Securities Held to Maturity, Estimated Fair Value 340 4,510
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 25,744 30,534
Securities Available for Sale, Gross Unrealized Gains 4 7
Securities Available for Sale, Gross Unrealized (Losses) (2,613) (3,444)
Securities Available for Sale, Estimated Fair Value 23,135 27,097
Securities Held to Maturity, Amortized Cost 13,005 4,442
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (497) (395)
Securities Held to Maturity, Estimated Fair Value 12,508 4,047
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 1,338,256 1,541,570
Securities Available for Sale, Gross Unrealized Gains 32 12
Securities Available for Sale, Gross Unrealized (Losses) (161,490) (196,119)
Securities Available for Sale, Estimated Fair Value 1,176,798 1,345,463
Securities Held to Maturity, Amortized Cost 469,593 509,311
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (18,205) (19,586)
Securities Held to Maturity, Estimated Fair Value 451,388 489,725
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 92,076 123,755
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (6,002) (8,615)
Securities Available for Sale, Estimated Fair Value 86,074 115,140
Securities Held to Maturity, Amortized Cost 154,466 188,201
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (10,113) (13,826)
Securities Held to Maturity, Estimated Fair Value 144,353 174,375
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 100,545 136,014
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (1,834) (3,773)
Securities Available for Sale, Estimated Fair Value 98,711 132,241
Securities Held to Maturity, Amortized Cost 759,807 759,755
Securities Held to Maturity, Gross Unrealized Gains 51 34
Securities Held to Maturity, Gross Unrealized (Losses) (41,985) (54,037)
Securities Held to Maturity, Estimated Fair Value $ 717,873 $ 705,752