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Borrowings - Composition of federal funds purchased and assets sold under agreements to repurchase (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Federal Funds Purchased and Securities Sold under Agreements to Repurchase    
Assets sold under agreements to repurchase $ 233,091 $ 281,529
Assets sold under agreements to repurchase $ 233,091 $ 281,529