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Borrowings - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]      
Fair value of collateral $ 11,500   $ 5,900
Amount of repurchase agreements $ 59,500   66,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Due Date, Earliest 2019    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Due Date, Last 2020    
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available $ 1,100    
FHLB line of credit advances 161,100   234,300
FHLB advances 67,300   67,300
Loans pledged 1,600,000   1,600,000
Interest expense related to FHLB advances $ 1,500 $ 460  
Minimum      
Assets Sold under Agreements to Repurchase [Line Items]      
Interest rate range of FHLB advances 1.55%    
Maximum      
Assets Sold under Agreements to Repurchase [Line Items]      
Interest rate range of FHLB advances 2.33%    
Federal Home Loan Bank of Des Moines [Member]      
Assets Sold under Agreements to Repurchase [Line Items]      
Fair value of collateral $ 16,400   16,000
Maturity on Demand [Member]      
Assets Sold under Agreements to Repurchase [Line Items]      
Amount of repurchase agreements 0    
U.S. Treasury Securities [Member]      
Assets Sold under Agreements to Repurchase [Line Items]      
Fair value of collateral $ 72,900   $ 73,900