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Investment Securities (Narrative) (Details)
$ in Millions
Jun. 30, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]    
FHLB stock $ 4.9 $ 6.0
FRBR stock 10.1 9.9
Investment securities portfolio available as lendable collateral $ 181.0 $ 213.6
Number of available-for-sale securities in an unrealized loss position | security 18 18,000
Deposits [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investment securities portfolio pledged as collateral $ 158.0  
Retail repurchase agreements [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investment securities portfolio pledged as collateral 15.9  
Others [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Investment securities portfolio pledged as collateral $ 162.5