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Commitments and Contingencies - Narrative (Details)
$ in Thousands
6 Months Ended
Mar. 31, 2016
USD ($)
defendant
plaintiff
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Residential mortgage principal balance repurchase request received   $ 543 $ 543
Residential mortgage principal balance FHLB credit enhancement   114,000  
Residential mortgage repurchase reserves FHLB credit enhancement   2,100 1,800
Residential Mortgage [Member] | Reserve for Off-balance Sheet Activities [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Valuation allowances and reserves, balance   $ 2,800 $ 2,600
Agostino, et al. v. Ameriprise Financial Services, Inc [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Number of unrelated defendants | defendant 2    
Amount alleged in damages $ 11,300    
Pending Litigation [Member] | Agostino, et al. v. Ameriprise Financial Services, Inc [Member]      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Number of plaintiffs | plaintiff 58