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Other Borrowings and Securities Sold Under Repurchase Agreements (Securities sold under repurchase agreements with Company customers) - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under repurchase agreement $ 324,154 $ 284,720
Weighted Average [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets sold under repurchase agreement, interest rate 0.39% 0.93%
Minimum [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreement counterparty, weighted average maturity of agreements 6 months  
Maximum [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreement counterparty, weighted average maturity of agreements 24 months  
Repurchase Agreement with 3 To 24 Maturity Months [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under repurchase agreement   $ 8,900