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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, 2024
Dec. 31, 2023
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,719,537 $ 1,959,007
Securities Available for Sale, Gross Unrealized Gains 2,988 37
Securities Available for Sale, Gross Unrealized (Losses) (29,991) (196,166)
Securities Available for Sale, Estimated Fair Value 1,692,534 1,762,878
Securities Held to Maturity, Amortized Cost 1,335,385 1,426,279
Securities Held to Maturity, Gross Unrealized Gains 98 51
Securities Held to Maturity, Gross Unrealized (Losses) (76,376) (70,826)
Securities Held to Maturity, Estimated Fair Value 1,259,107 1,355,504
U.S. Treasury Securities [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 203,524 396,179
Securities Available for Sale, Gross Unrealized Gains 548 0
Securities Available for Sale, Gross Unrealized (Losses) (1,403) (23,811)
Securities Available for Sale, Estimated Fair Value 202,669 372,368
Securities Held to Maturity, Amortized Cost 29,842 29,068
Securities Held to Maturity, Gross Unrealized Gains 1 0
Securities Held to Maturity, Gross Unrealized (Losses) (522) (26)
Securities Held to Maturity, Estimated Fair Value 29,321 29,042
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 41,194 6,207
Securities Available for Sale, Gross Unrealized Gains 0 1
Securities Available for Sale, Gross Unrealized (Losses) (2,387) (416)
Securities Available for Sale, Estimated Fair Value 38,807 5,792
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
Securities Available for Sale, Gross Unrealized Gains   0
Securities Available for Sale, Gross Unrealized (Losses)   0
Securities Available for Sale, Estimated Fair Value   0
Securities Held to Maturity, Amortized Cost   340
Securities Held to Maturity, Gross Unrealized Gains   0
Securities Held to Maturity, Gross Unrealized (Losses)   0
Securities Held to Maturity, Estimated Fair Value   340
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 31,365 25,744
Securities Available for Sale, Gross Unrealized Gains 3 4
Securities Available for Sale, Gross Unrealized (Losses) (2,957) (2,613)
Securities Available for Sale, Estimated Fair Value 28,411 23,135
Securities Held to Maturity, Amortized Cost 16,218 13,005
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (844) (497)
Securities Held to Maturity, Estimated Fair Value 15,374 12,508
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 1,091,122 1,338,256
Securities Available for Sale, Gross Unrealized Gains 1,610 32
Securities Available for Sale, Gross Unrealized (Losses) (22,194) (161,490)
Securities Available for Sale, Estimated Fair Value 1,070,538 1,176,798
Securities Held to Maturity, Amortized Cost 423,372 469,593
Securities Held to Maturity, Gross Unrealized Gains 94 0
Securities Held to Maturity, Gross Unrealized (Losses) (23,853) (18,205)
Securities Held to Maturity, Estimated Fair Value 399,613 451,388
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 0 92,076
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) 0 (6,002)
Securities Available for Sale, Estimated Fair Value 0 86,074
Securities Held to Maturity, Amortized Cost 123,685 154,466
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (8,004) (10,113)
Securities Held to Maturity, Estimated Fair Value 115,681 144,353
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 352,332 100,545
Securities Available for Sale, Gross Unrealized Gains 827 0
Securities Available for Sale, Gross Unrealized (Losses) (1,050) (1,834)
Securities Available for Sale, Estimated Fair Value 352,109 98,711
Securities Held to Maturity, Amortized Cost 742,268 759,807
Securities Held to Maturity, Gross Unrealized Gains 3 51
Securities Held to Maturity, Gross Unrealized (Losses) (43,153) (41,985)
Securities Held to Maturity, Estimated Fair Value $ 699,118 $ 717,873