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Borrowings - Maturities of FHLB Borrowings (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Short-Term Debt [Line Items]    
Total Borrowing Capacity $ 7,530,725 $ 5,704,515
Amount $ 2,260,000 $ 865,000
Weighted Average Rate 4.66% 3.74%
Available Borrowing Capacity $ 5,270,725 $ 4,839,515
FRB    
Short-Term Debt [Line Items]    
Total Borrowing Capacity   4,583,277
Amount   $ 600,000
Weighted Average Rate   3.40%
Available Borrowing Capacity   $ 3,983,277
FRB Discount Window    
Short-Term Debt [Line Items]    
Total Borrowing Capacity 805,300 670,058
Amount $ 460,000 $ 265,000
Weighted Average Rate 5.25% 4.50%
Available Borrowing Capacity $ 345,300 $ 405,058
FRB Bank Term Funding Program (“BTFP”)    
Short-Term Debt [Line Items]    
Total Borrowing Capacity 1,709,056  
Amount $ 1,700,000  
Weighted Average Rate 4.47%  
Available Borrowing Capacity $ 9,056  
Unsecured Federal Funds lines    
Short-Term Debt [Line Items]    
Total Borrowing Capacity 417,680 451,180
Amount $ 0 $ 0
Weighted Average Rate 0.00% 0.00%
Available Borrowing Capacity $ 417,680 $ 451,180
Federal Home Loan Bank Certificates and Obligations (FHLB)    
Short-Term Debt [Line Items]    
Total Borrowing Capacity 4,598,689  
Amount $ 100,000  
Weighted Average Rate 5.27%  
Available Borrowing Capacity $ 4,498,689