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Borrowed Funds - Schedule of Pledged Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Loans $ 10,068,156 $ 9,868,718
Debt securities 453,208 457,648
Assets 13,498,183 13,103,896
FHLB and FRB    
Debt Instrument [Line Items]    
Loans 7,253,277 6,487,980
Debt securities 997,973 830,057
Assets 8,251,250 7,318,037
Repurchase agreements    
Debt Instrument [Line Items]    
Loans 0 0
Debt securities 93,145 105,294
Assets 93,145 105,294
Total pledged assets    
Debt Instrument [Line Items]    
Loans 7,253,277 6,487,980
Debt securities 1,091,118 935,351
Assets $ 8,344,395 $ 7,423,331