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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, 2023
Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 2,028,863 $ 2,270,709
Securities Available for Sale, Gross Unrealized Gains 3 380
Securities Available for Sale, Gross Unrealized (Losses) (262,692) (247,007)
Debt Securities, Available-for-sale 1,766,174 2,024,082
Securities Held to Maturity, Amortized Cost 1,438,287 1,494,514
Securities Held to Maturity, Gross Unrealized Gains 3 37
Securities Held to Maturity, Gross Unrealized (Losses) (125,419) (87,962)
Securities Held to Maturity, Estimated Fair Value 1,312,871 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 396,070 425,719
Securities Available for Sale, Gross Unrealized Gains 0 308
Securities Available for Sale, Gross Unrealized (Losses) (32,594) (34,514)
Debt Securities, Available-for-sale 363,476 391,513
Securities Held to Maturity, Amortized Cost 28,872 28,295
Securities Held to Maturity, Gross Unrealized Gains 1 0
Securities Held to Maturity, Gross Unrealized (Losses) (987) (115)
Securities Held to Maturity, Estimated Fair Value 27,886 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 7,309 8,297
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (529) (531)
Debt Securities, Available-for-sale 6,780 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 4,771 4,820
Securities Available for Sale, Gross Unrealized Gains 0 53
Securities Available for Sale, Gross Unrealized (Losses) (129) (11)
Debt Securities, Available-for-sale 4,642 4,862
Securities Held to Maturity, Amortized Cost 341 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 341 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 27,009 30,534
Securities Available for Sale, Gross Unrealized Gains 0 7
Securities Available for Sale, Gross Unrealized (Losses) (4,128) (3,444)
Debt Securities, Available-for-sale 22,881 27,097
Securities Held to Maturity, Amortized Cost 13,090 4,442
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (1,083) (395)
Securities Held to Maturity, Estimated Fair Value 12,007 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 1,386,253 1,541,570
Securities Available for Sale, Gross Unrealized Gains 3 12
Securities Available for Sale, Gross Unrealized (Losses) (214,735) (196,119)
Debt Securities, Available-for-sale 1,171,521 1,345,463
Securities Held to Maturity, Amortized Cost 474,003 509,311
Securities Held to Maturity, Gross Unrealized Gains 1 0
Securities Held to Maturity, Gross Unrealized (Losses) (36,482) (19,586)
Securities Held to Maturity, Estimated Fair Value 437,522 489,725
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 98,610 123,755
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (8,208) (8,615)
Debt Securities, Available-for-sale 90,402 115,140
Securities Held to Maturity, Amortized Cost 162,031 188,201
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (14,474) (13,826)
Securities Held to Maturity, Estimated Fair Value 147,557 174,375
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 108,841 136,014
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (2,369) (3,773)
Debt Securities, Available-for-sale 106,472 132,241
Securities Held to Maturity, Amortized Cost 759,950 759,755
Securities Held to Maturity, Gross Unrealized Gains 1 34
Securities Held to Maturity, Gross Unrealized (Losses) (72,393) (54,037)
Securities Held to Maturity, Estimated Fair Value $ 687,558 $ 705,752