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Investment Securities - Held-to-Maturity with Unrecognized Losses (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
Fair Value  
Less than 12 months $ 2,108,785
12 months or longer 642,541
Total 2,751,326
Unrecognized Losses  
Less than 12 months (260,532)
12 months or longer (44,603)
Total (305,135)
U.S. government-sponsored entities and agencies  
Fair Value  
Less than 12 months 529,507
12 months or longer 190,927
Total 720,434
Unrecognized Losses  
Less than 12 months (69,932)
12 months or longer (25,466)
Total (95,398)
Mortgage-backed securities  
Fair Value  
Less than 12 months 649,804
12 months or longer 419,930
Total 1,069,734
Unrecognized Losses  
Less than 12 months (47,157)
12 months or longer (12,783)
Total (59,940)
States and political subdivisions  
Fair Value  
Less than 12 months 929,474
12 months or longer 31,684
Total 961,158
Unrecognized Losses  
Less than 12 months (143,443)
12 months or longer (6,354)
Total $ (149,797)