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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, 2024
Dec. 31, 2023
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,643,310 $ 1,959,007
Securities Available for Sale, Gross Unrealized Gains 4,571 37
Securities Available for Sale, Gross Unrealized (Losses) (26,222) (196,166)
Debt Securities, Available-for-sale 1,621,659 1,762,878
Securities Held to Maturity, Amortized Cost 1,380,487 1,426,279
Securities Held to Maturity, Gross Unrealized Gains 50 51
Securities Held to Maturity, Gross Unrealized (Losses) (87,406) (70,826)
Securities Held to Maturity, Estimated Fair Value 1,293,131 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 173,201 396,179
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (246) (23,811)
Debt Securities, Available-for-sale 172,955 372,368
Securities Held to Maturity, Amortized Cost 29,455 29,068
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (650) (26)
Securities Held to Maturity, Estimated Fair Value 28,805 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   6,207
Securities Available for Sale, Gross Unrealized Gains   1
Securities Available for Sale, Gross Unrealized (Losses)   (416)
Debt Securities, Available-for-sale   5,792
Securities Held to Maturity, Amortized Cost   0
Securities Held to Maturity, Gross Unrealized Gains   0
Securities Held to Maturity, Gross Unrealized (Losses)   0
Securities Held to Maturity, Estimated Fair Value   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 26,415 25,744
Securities Available for Sale, Gross Unrealized Gains 4 4
Securities Available for Sale, Gross Unrealized (Losses) (2,930) (2,613)
Debt Securities, Available-for-sale 23,489 23,135
Securities Held to Maturity, Amortized Cost 17,998 13,005
Securities Held to Maturity, Gross Unrealized Gains 1 0
Securities Held to Maturity, Gross Unrealized (Losses) (867) (497)
Securities Held to Maturity, Estimated Fair Value 17,132 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 1,081,088 1,338,256
Securities Available for Sale, Gross Unrealized Gains 1,914 32
Securities Available for Sale, Gross Unrealized (Losses) (22,133) (161,490)
Debt Securities, Available-for-sale 1,060,869 1,176,798
Securities Held to Maturity, Amortized Cost 449,781 469,593
Securities Held to Maturity, Gross Unrealized Gains 35 0
Securities Held to Maturity, Gross Unrealized (Losses) (25,708) (18,205)
Securities Held to Maturity, Estimated Fair Value 424,108 451,388
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 138,951 154,466
Securities Held to Maturity, Gross Unrealized Gains 1 0
Securities Held to Maturity, Gross Unrealized (Losses) (10,193) (10,113)
Securities Held to Maturity, Estimated Fair Value 128,759 144,353
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 362,606 100,545
Securities Available for Sale, Gross Unrealized Gains 2,653 0
Securities Available for Sale, Gross Unrealized (Losses) (913) (1,834)
Debt Securities, Available-for-sale 364,346 98,711
Securities Held to Maturity, Amortized Cost 744,302 759,807
Securities Held to Maturity, Gross Unrealized Gains 13 51
Securities Held to Maturity, Gross Unrealized (Losses) (49,988) (41,985)
Securities Held to Maturity, Estimated Fair Value $ 694,327 $ 717,873