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Investment Securities (Schedule of Gains and Losses on the Sale and Exchange of Investment Securities Available for Sale) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]          
Proceeds from sale of investment securities available for sale $ 383,420 $ 670,871 $ 930,757 $ 2,297,121  
Gross realized gains: 2,689 6,094 9,945 15,051  
Gross realized losses: (426) (2,669) (429) (3,394)  
Net realized gain 2,263 3,425 9,516 11,657  
Unrealized Gain (Loss) on Securities 4,918 410 1,048 2,079  
Gain on investment securities, net 7,181 $ 3,835 10,564 $ 13,736  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 2,271,307   2,271,307   $ 1,922,326
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (33,552)   (33,552)   (9,848)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,315,987   1,315,987   1,205,877
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (21,418)   (21,418)   (11,760)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 3,587,294   3,587,294   3,128,203
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (54,970)   (54,970)   (21,608)
State and municipal obligations          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,222   1,222    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (3)   (3)    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0   0    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0   0    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,222   1,222    
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax $ (3)   $ (3)   $ 0