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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, 2024
Dec. 31, 2023
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,691,555 $ 1,959,007
Securities Available for Sale, Gross Unrealized Gains 51,523 37
Securities Available for Sale, Gross Unrealized (Losses) (17,283) (196,166)
Debt Securities, Available-for-sale 1,725,795 1,762,878
Securities Held to Maturity, Amortized Cost 1,358,358 1,426,279
Securities Held to Maturity, Gross Unrealized Gains 2,478 51
Securities Held to Maturity, Gross Unrealized (Losses) (44,669) (70,826)
Securities Held to Maturity, Estimated Fair Value 1,316,167 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 198,426 396,179
Securities Available for Sale, Gross Unrealized Gains 4,212 0
Securities Available for Sale, Gross Unrealized (Losses) 0 (23,811)
Debt Securities, Available-for-sale 202,638 372,368
Securities Held to Maturity, Amortized Cost 29,648 29,068
Securities Held to Maturity, Gross Unrealized Gains 232 0
Securities Held to Maturity, Gross Unrealized (Losses) 0 (26)
Securities Held to Maturity, Estimated Fair Value 29,880 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 19,494 6,207
Securities Available for Sale, Gross Unrealized Gains 0 1
Securities Available for Sale, Gross Unrealized (Losses) (159) (416)
Debt Securities, Available-for-sale 19,335 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
Debt Securities, Available-for-sale   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 27,787 25,744
Securities Available for Sale, Gross Unrealized Gains 15 4
Securities Available for Sale, Gross Unrealized (Losses) (2,004) (2,613)
Debt Securities, Available-for-sale 25,798 23,135
Securities Held to Maturity, Amortized Cost 17,773 13,005
Securities Held to Maturity, Gross Unrealized Gains 3 0
Securities Held to Maturity, Gross Unrealized (Losses) (407) (497)
Securities Held to Maturity, Estimated Fair Value 17,369 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 1,086,688 1,338,256
Securities Available for Sale, Gross Unrealized Gains 32,970 32
Securities Available for Sale, Gross Unrealized (Losses) (14,348) (161,490)
Debt Securities, Available-for-sale 1,105,310 1,176,798
Securities Held to Maturity, Amortized Cost 436,177 469,593
Securities Held to Maturity, Gross Unrealized Gains 2,104 0
Securities Held to Maturity, Gross Unrealized (Losses) (11,088) (18,205)
Securities Held to Maturity, Estimated Fair Value 427,193 451,388
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)
Debt Securities, Available-for-sale 0 86,074
Securities Held to Maturity, Amortized Cost 131,348 154,466
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (6,179) (10,113)
Securities Held to Maturity, Estimated Fair Value 125,169 144,353
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 359,160 100,545
Securities Available for Sale, Gross Unrealized Gains 14,326 0
Securities Available for Sale, Gross Unrealized (Losses) (772) (1,834)
Debt Securities, Available-for-sale 372,714 98,711
Securities Held to Maturity, Amortized Cost 743,412 759,807
Securities Held to Maturity, Gross Unrealized Gains 139 51
Securities Held to Maturity, Gross Unrealized (Losses) (26,995) (41,985)
Securities Held to Maturity, Estimated Fair Value $ 716,556 $ 717,873