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Investment in Qualified Affordable Housing (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Mar. 31, 2015
Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Noninterest Expense $ 44,667 $ 46,241 $ 90,387 $ 92,020      
Income Tax Expense (Benefit) 8,388 9,441 16,400 17,438      
Affordable Housing Program Assessments 1,700 1,700 3,500 3,400      
Net Income 21,039 21,810 40,083 41,387      
Other Assets 15,926   15,926   $ 14,645    
Assets 7,309,569 6,787,190 7,309,569 6,787,190 7,001,199    
Retained earnings 495,592   495,592   484,484    
Affordable Housing Program Obligation 21,339   21,339   16,629 $ 16,629  
Affordable Housing Tax Credits and Other Tax Benefits, Amount 2,300 2,200 4,500 4,400      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 705,963   705,963   696,541    
Other Assets [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Other Assets         140,803    
Other Assets [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Other Assets         138,746    
Retained Earnings [Member]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net Income     40,083 41,387      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 495,592 471,131 495,592 471,131 486,541   $ 460,643
Retained Earnings [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Retained earnings         486,541    
Retained Earnings [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Retained earnings         484,484    
Assets [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Assets         7,003,256    
Assets [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Assets         7,001,199    
Equity [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest         698,598    
Equity [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest         696,541    
Qualified Affordable Housing [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Equity Method Investments $ 54,457   $ 54,457     $ 48,911  
Other Income [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Noninterest Expense   48,196   95,894 195,234    
Other Income [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Noninterest Expense   46,241   92,020 187,510    
Income Tax Expense [Member] | Scenario, Previously Reported [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Income Tax Expense (Benefit)   7,469   13,505 28,602    
Income Tax Expense [Member] | Restatement Adjustment [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Income Tax Expense (Benefit)   9,441   17,438 36,459    
Net Income [Domain] | Scenario, Previously Reported [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net Income   21,827   41,446 84,090    
Net Income [Domain] | Restatement Adjustment [Member] | Investment, Name [Domain]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net Income   $ 21,810   $ 41,387 $ 83,957