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Investment Securities (Available For Sale Securities Unrealized Gains And Losses, By Security Type) (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Investment [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 13,738,206,000 $ 14,419,133,000
Available For Sale Securities, Gross Unreailzed Gain at Period End 742,000 163,823,000
Available For Sale Securities, Gross Unrealized Loss at Period End (1,500,632,000) (132,929,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale, Fair Value 12,238,316,000 14,450,027,000
U.S. Government And Federal Agency Obligations [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,078,807,000 1,035,477,000
Available For Sale Securities, Gross Unreailzed Gain at Period End 29,000 47,484,000
Available For Sale Securities, Gross Unrealized Loss at Period End (43,430,000) (2,241,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale, Fair Value 1,035,406,000 1,080,720,000
US Government-sponsored Enterprise Debt Securities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 55,729,000 50,773,000
Available For Sale Securities, Gross Unreailzed Gain at Period End 0 1,901,000
Available For Sale Securities, Gross Unrealized Loss at Period End (12,621,000) (919,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale, Fair Value 43,108,000 51,755,000
State and municipal obligations [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,965,028,000 2,072,210,000
Available For Sale Securities, Gross Unreailzed Gain at Period End 174,000 41,540,000
Available For Sale Securities, Gross Unrealized Loss at Period End (198,093,000) (16,923,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale, Fair Value 1,767,109,000 2,096,827,000
Agency mortgage-backed securities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 5,087,893,000 5,698,088,000
Available For Sale Securities, Gross Unreailzed Gain at Period End 191,000 52,676,000
Available For Sale Securities, Gross Unrealized Loss at Period End (779,657,000) (67,764,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale, Fair Value 4,308,427,000 5,683,000,000
Non-agency mortgage-backed securities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,423,469,000 1,383,037,000
Available For Sale Securities, Gross Unreailzed Gain at Period End 92,000 681,000
Available For Sale Securities, Gross Unrealized Loss at Period End (211,954,000) (17,241,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale, Fair Value 1,211,607,000 1,366,477,000
Asset-backed Securities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 3,588,025,000 3,546,024,000
Available For Sale Securities, Gross Unreailzed Gain at Period End 256,000 12,921,000
Available For Sale Securities, Gross Unrealized Loss at Period End (190,480,000) (19,726,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale, Fair Value 3,397,801,000 3,539,219,000
Total mortgage and asset-backed securities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 10,099,387,000 10,627,149,000
Available For Sale Securities, Gross Unreailzed Gain at Period End 539,000 66,278,000
Available For Sale Securities, Gross Unrealized Loss at Period End (1,182,091,000) (104,731,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale, Fair Value 8,917,835,000 10,588,696,000
Other Debt Securities [Member]    
Investment [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 539,255,000 633,524,000
Available For Sale Securities, Gross Unreailzed Gain at Period End 0 6,620,000
Available For Sale Securities, Gross Unrealized Loss at Period End (64,397,000) (8,115,000)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0
Debt Securities, Available-for-sale, Fair Value $ 474,858,000 $ 632,029,000