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Fair Value Part 3 (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Securities held to maturity $ 1,190,161 $ 1,190,161   $ 1,170,685  
Net LHFI 6,375,907 6,375,907   6,379,853  
FDIC indemnification asset 2,632 2,632 $ 10,866 6,997 $ 14,347
Deposits 9,792,174 9,792,174   9,698,358  
Long-term FHLB advances 1,204 1,204   1,253  
Subordinated notes 49,953 49,953   49,936  
Junior subordinated debt securities 61,856 61,856   61,856  
Nonfinancial Assets and Liabilities [Abstract]          
Outstanding balances in impaired loans 37,900 37,900   47,100  
Foreclosed assets measured at fair value   20,500 24,600    
Allowance for possible loan losses, Charge-offs for foreclosed assets upon initial recognition   3,900 6,700    
Foreclosed assets re-measured after initial recognition   25,700 25,900    
Write-downs of allowance for foreclosed assets after initial recognition   $ 993 $ 3,300    
Estimated fair value of financial instruments with immediate and shorter-term maturities maximum   90 days      
Noninterest income (loss) in Mortgage banking, net for changes in fair value of LHFS (2,200) $ (1,800)      
Interest earned on LHFS included in Interest and fees on LHFS and LHFI 1,300 2,300      
Fair value and the contractual principal outstanding of the LHFS [Abstract]          
Fair value of LHFS 128,329 128,329   91,182  
LHFS contractual principal outstanding 126,627 126,627   88,106  
Fair value less unpaid principal 1,702 1,702   3,076  
Level 2 [Member] | Carrying Value [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Cash and short-term investments 255,050 255,050   317,858  
Securities held to maturity 1,190,161 1,190,161   1,170,685  
Deposits 9,792,174 9,792,174   9,698,358  
Short-term liabilities 679,206 679,206   868,620  
Long-term FHLB advances 1,204 1,204   1,253  
Subordinated notes 49,953 49,953   49,936  
Junior subordinated debt securities 61,856 61,856   61,856  
Level 2 [Member] | Estimate Fair Value [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Cash and short-term investments 255,050 255,050   317,858  
Securities held to maturity 1,200,217 1,200,217   1,182,846  
Deposits 9,797,257 9,797,257   9,702,864  
Short-term liabilities 679,206 679,206   868,620  
Long-term FHLB advances 1,211 1,211   1,263  
Subordinated notes 52,626 52,626   53,504  
Junior subordinated debt securities 46,392 46,392   46,392  
Level 3 [Member] | Carrying Value [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Net LHFI 6,375,907 6,375,907   6,379,853  
Net acquired loans 453,770 453,770   537,350  
FDIC indemnification asset 2,632 2,632   6,997  
Level 3 [Member] | Estimate Fair Value [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Net LHFI 6,431,470 6,431,470   6,453,618  
Net acquired loans 453,770 453,770   537,350  
FDIC indemnification asset $ 2,632 $ 2,632   $ 6,997