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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
security
shares
Dec. 31, 2021
USD ($)
security
shares
Securities in the available-for-sale portfolio in a continuous loss position    
Number of individual securities in a continuous loss position | security 499 318
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses $ (471,100) $ (125,923)
12 Months or More Unrealized Losses (200,254) (31,373)
Total Unrealized Losses (671,354) (157,296)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 6,209,790 6,044,029
12 Months or More Fair Value 1,587,476 497,202
Total Fair Value 7,797,266 6,541,231
Credit losses 0 $ 0
Amortized cost basis $ 0  
Investment securities comprised of collateralized loan obligations rated AA or better and obligations issued by local state and political subdivisions rated AA or better 4.00% 4.00%
Class B restricted shares | Visa    
Time in Continuous Loss, Fair Value    
Shares held | shares 120,000 120,000
Cost basis $ 0 $ 0
U.S. Treasury and government agency debt securities    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (4,314) (3,355)
12 Months or More Unrealized Losses (9,714) (869)
Total Unrealized Losses (14,028) (4,224)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 93,417 134,468
12 Months or More Fair Value 106,127 16,642
Total Fair Value 199,544 151,110
Residential - Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (75,047) (10,876)
12 Months or More Unrealized Losses (13,106) (1,543)
Total Unrealized Losses (88,153) (12,419)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 1,209,850 1,230,104
12 Months or More Fair Value 106,145 32,415
Total Fair Value 1,315,995 1,262,519
Residential - Government agency    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (5,115) (291)
Total Unrealized Losses (5,115) (291)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 122,965 51,231
Total Fair Value 122,965 51,231
Commercial - Government agency    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (10,635) (5,239)
12 Months or More Unrealized Losses (15,239) (1,282)
Total Unrealized Losses (25,874) (6,521)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 169,320 186,024
12 Months or More Fair Value 153,626 26,063
Total Fair Value 322,946 212,087
Commercial - Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (71,323) (22,179)
12 Months or More Unrealized Losses (105,674) (26,535)
Total Unrealized Losses (176,997) (48,714)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 562,986 744,819
12 Months or More Fair Value 682,848 397,123
Total Fair Value 1,245,834 1,141,942
Government agency    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (135,357) (31,432)
12 Months or More Unrealized Losses (8,157)  
Total Unrealized Losses (143,514) (31,432)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 1,904,905 1,441,848
12 Months or More Fair Value 73,679  
Total Fair Value 1,978,584 1,441,848
Government-sponsored enterprises    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (161,761) (52,551)
12 Months or More Unrealized Losses (48,364) (1,144)
Total Unrealized Losses (210,125) (53,695)
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 2,012,931 2,255,535
12 Months or More Fair Value 465,051 24,959
Total Fair Value 2,477,982 $ 2,280,494
Collateralized Loan Obligations    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (748)  
Total Unrealized Losses (748)  
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 79,181  
Total Fair Value 79,181  
Debt securities issued by states and political subdivisions    
Time in Continuous Loss, Unrealized Losses    
Less Than 12 Months Unrealized Losses (6,800)  
Total Unrealized Losses (6,800)  
Time in Continuous Loss, Fair Value    
Less Than 12 Months, Fair Value 54,235  
Total Fair Value $ 54,235