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Securities Available for Sale and Held to Maturity - Securities with Gross Unrealized Losses, Segregated by Length of Impairment (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months $ 425,096 $ 2,078,165
Estimated Fair Value, 12 Months or More 2,338,014 1,342,186
Estimated Fair Value, Total 2,763,110 3,420,351
Gross Unrealized (Losses), Less than 12 Months (38,866) (130,121)
Gross Unrealized (Losses), 12 Months or More (289,199) (204,848)
Gross Unrealized (Losses), Total (328,065) (334,969)
US Treasury Securities [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 42,183 161,298
Estimated Fair Value, 12 Months or More 349,097 258,087
Estimated Fair Value, Total 391,280 419,385
Gross Unrealized (Losses), Less than 12 Months (1,034) (5,655)
Gross Unrealized (Losses), 12 Months or More (32,326) (28,974)
Gross Unrealized (Losses), Total (33,360) (34,629)
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 0 1,828
Estimated Fair Value, 12 Months or More 6,949 5,938
Estimated Fair Value, Total 6,949 7,766
Gross Unrealized (Losses), Less than 12 Months 0 (184)
Gross Unrealized (Losses), 12 Months or More (517) (347)
Gross Unrealized (Losses), Total (517) (531)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 1,008 1,017
Estimated Fair Value, 12 Months or More 0 3,664
Estimated Fair Value, Total 1,008 4,681
Gross Unrealized (Losses), Less than 12 Months (11) (11)
Gross Unrealized (Losses), 12 Months or More 0 (3)
Gross Unrealized (Losses), Total (11) (14)
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 5,161 27,223
Estimated Fair Value, 12 Months or More 27,374 3,577
Estimated Fair Value, Total 32,535 30,800
Gross Unrealized (Losses), Less than 12 Months (174) (3,270)
Gross Unrealized (Losses), 12 Months or More (3,488) (569)
Gross Unrealized (Losses), Total (3,662) (3,839)
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Estimated Fair Value, Less than 12 Months 321,261 770,865
Estimated Fair Value, 12 Months or More 1,391,292 1,062,041
Estimated Fair Value, Total 1,712,553 1,832,906
Gross Unrealized (Losses), Less than 12 Months (5,059) (41,807)
Gross Unrealized (Losses), 12 Months or More (205,642) (173,898)
Gross Unrealized (Losses), Total (210,701) (215,705)
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]    
Estimated Fair Value, Less than 12 Months 3,847 281,964
Estimated Fair Value, 12 Months or More 251,599 7,235
Estimated Fair Value, Total 255,446 289,199
Gross Unrealized (Losses), Less than 12 Months (208) (21,452)
Gross Unrealized (Losses), 12 Months or More (21,864) (989)
Gross Unrealized (Losses), Total (22,072) (22,441)
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]    
Estimated Fair Value, Less than 12 Months 51,636 833,970
Estimated Fair Value, 12 Months or More 311,703 1,644
Estimated Fair Value, Total 363,339 835,614
Gross Unrealized (Losses), Less than 12 Months (32,380) (57,742)
Gross Unrealized (Losses), 12 Months or More (25,362) (68)
Gross Unrealized (Losses), Total $ (57,742) $ (57,810)