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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, 2022
Dec. 31, 2021
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 2,776,415 $ 3,256,289
Securities Available for Sale, Gross Unrealized Gains 9 13,509
Securities Available for Sale, Gross Unrealized (Losses) (331,938) (30,921)
Debt Securities, Available-for-sale 2,444,486 3,238,877
Securities Held to Maturity, Amortized Cost 1,156,985 342,537
Securities Held to Maturity, Gross Unrealized Gains 5 11,011
Securities Held to Maturity, Gross Unrealized (Losses) (91,162) (37)
Securities Held to Maturity, Estimated Fair Value 1,065,828 353,511
U.S. Treasury Securities [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 458,475 349,562
Securities Available for Sale, Gross Unrealized Gains 0 16
Securities Available for Sale, Gross Unrealized (Losses) (42,197) (4,938)
Debt Securities, Available-for-sale 416,278 344,640
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
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 9,681 14,044
Securities Available for Sale, Gross Unrealized Gains 0 20
Securities Available for Sale, Gross Unrealized (Losses) (565) (337)
Debt Securities, Available-for-sale 9,116 13,727
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 4,836 5,134
Securities Available for Sale, Gross Unrealized Gains 0 580
Securities Available for Sale, Gross Unrealized (Losses) (73) 0
Debt Securities, Available-for-sale 4,763 5,714
Securities Held to Maturity, Amortized Cost 4,512 7,328
Securities Held to Maturity, Gross Unrealized Gains 3 64
Securities Held to Maturity, Gross Unrealized (Losses) (8) (3)
Securities Held to Maturity, Estimated Fair Value 4,507 7,389
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 32,067 38,942
Securities Available for Sale, Gross Unrealized Gains 8 665
Securities Available for Sale, Gross Unrealized (Losses) (3,911) (34)
Debt Securities, Available-for-sale 28,164 39,573
Securities Held to Maturity, Amortized Cost 4,527 5,005
Securities Held to Maturity, Gross Unrealized Gains 0 187
Securities Held to Maturity, Gross Unrealized (Losses) (467) (3)
Securities Held to Maturity, Estimated Fair Value 4,060 5,189
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 1,992,351 2,230,498
Securities Available for Sale, Gross Unrealized Gains 0 8,945
Securities Available for Sale, Gross Unrealized (Losses) (274,294) (21,014)
Debt Securities, Available-for-sale 1,718,057 2,218,429
Securities Held to Maturity, Amortized Cost 179,375 43,444
Securities Held to Maturity, Gross Unrealized Gains 0 962
Securities Held to Maturity, Gross Unrealized (Losses) (19,845) 0
Securities Held to Maturity, Estimated Fair Value 159,530 44,406
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 134,630 193,908
Securities Available for Sale, Gross Unrealized Gains 1 2,879
Securities Available for Sale, Gross Unrealized (Losses) (8,493) (97)
Debt Securities, Available-for-sale 126,138 196,690
Securities Held to Maturity, Amortized Cost 197,923 241,934
Securities Held to Maturity, Gross Unrealized Gains 2 9,015
Securities Held to Maturity, Gross Unrealized (Losses) (13,637) (31)
Securities Held to Maturity, Estimated Fair Value 184,288 250,918
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 144,375 424,201
Securities Available for Sale, Gross Unrealized Gains 0 404
Securities Available for Sale, Gross Unrealized (Losses) (2,405) (4,501)
Debt Securities, Available-for-sale 141,970 420,104
Securities Held to Maturity, Amortized Cost 770,648 44,826
Securities Held to Maturity, Gross Unrealized Gains 0 783
Securities Held to Maturity, Gross Unrealized (Losses) (57,205) 0
Securities Held to Maturity, Estimated Fair Value $ 713,443 $ 45,609