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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details)
number in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Loans
Jun. 30, 2014
USD ($)
Loans
Jun. 30, 2015
USD ($)
Loans
Jun. 30, 2014
USD ($)
Loans
Dec. 31, 2014
USD ($)
Financing Receivable, Modifications [Line Items]          
Outstanding Recorded Investment $ 6,251,000   $ 6,251,000   $ 6,600,000
Reserves specific to modified loans $ 2,000   $ 2,000   $ 132,000
Defaults on troubled debt restructurings 0 0 0 0  
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0   $ 0    
Commercial and industrial          
Financing Receivable, Modifications [Line Items]          
Number of Loans | Loans     2    
Pre-Modification Outstanding Recorded Investment     $ 42,000    
Principal Modification     0    
Post Modification Outstanding Recorded Investment     42,000    
Outstanding Recorded Investment $ 38,000   $ 38,000    
Equity loans and lines of credit          
Financing Receivable, Modifications [Line Items]          
Number of Loans | Loans   1   1  
Pre-Modification Outstanding Recorded Investment   $ 7,000   $ 7,000  
Principal Modification   0   0  
Post Modification Outstanding Recorded Investment   7,000   7,000  
Outstanding Recorded Investment   $ 6,000   $ 6,000