v3.22.4
Securities (Securities Available for Sale) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 19,908,432 $ 13,445,888
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 17,158 518,805
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 1,681,985 40,065
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale 18,243,605 13,924,628
US Treasury [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 5,450,546 2,165,702
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 23,333
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 398,959 9,602
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale 5,051,587 2,179,433
Residential Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 7,316,824 4,059,692
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 8,050 31,662
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 948,638 25,089
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale 6,376,236 4,066,265
States and Political Subdivisions [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 7,098,635 7,178,135
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 9,108 463,810
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 334,388 5,374
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale 6,773,355 7,636,571
Other [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 42,427 42,359
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale $ 42,427 $ 42,359