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Borrowings (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Assets Sold under Agreements to Repurchase [Line Items]          
Fair value of collateral $ 33.7   $ 33.7   $ 7.0
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Due Date, Earliest 2018   2018    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Due Date, Last 2020   2020    
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available $ 787.4   $ 787.4    
FHLB advances 129.1   129.1   25.0
Interest expense related to FHLB advances $ 0.6 $ 0.2 $ 1.3 $ 0.5  
Minimum          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest rate range of FHLB advances 1.31%   1.31%    
Maximum          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest rate range of FHLB advances 2.33%   2.33%    
Federal Home Loan Bank of Des Moines [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Fair value of collateral $ 27.6   $ 27.6   28.8
U.S. Treasury Securities [Member]          
Assets Sold under Agreements to Repurchase [Line Items]          
Fair value of collateral $ 126.5   $ 126.5   $ 99.1