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Borrowings and Borrowing Capacity - Summary of Customer Repurchase Agreements are Secured by Pledged Securities with Carrying Amount (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Pledged Securities $ 85,985 $ 194,571
Pledged Securities | Customer Repurchase Agreements    
Debt Instrument [Line Items]    
Pledged Securities 13,460 13,486
Pledged Securities | Customer Repurchase Agreements | U.S. Government Agency Obligations    
Debt Instrument [Line Items]    
Pledged Securities $ 13,460 10,488
Pledged Securities | Customer Repurchase Agreements | Mortgage-backed Securities, Residential    
Debt Instrument [Line Items]    
Pledged Securities   $ 2,998