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Deposits (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Deposits [Line Items]    
Noninterest-bearing demand $ 7,006,388,000 $ 7,370,963,000
Interest-bearing demand 5,410,903,000 5,819,539,000
Savings and money market accounts 6,434,621,000 6,403,995,000
Total demand and savings 18,851,912,000 19,594,497,000
Brokered deposits 208,416,000 251,526,000
Time deposits 1,589,210,000 1,727,476,000
Total Deposits 20,649,538,000 21,573,499,000
Time Deposits, $250,000 or More 214,800,000 219,000,000
Maturities of Time Deposits [Abstract]    
2022 966,235,000  
2023 234,681,000  
2024 285,527,000  
2025 19,704,000  
2026 18,474,000  
Thereafter 64,589,000  
Total 1,589,210,000 1,727,476,000
Certificates of Deposit    
Deposits [Line Items]    
Time Deposits, $100,000 or More $ 691,400,000 $ 745,500,000