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Fair value (Estimated fair value and carrying value) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities $ 1,418,958   $ 1,588,425      
Held to maturity Fair Value 26,844   0      
Federal Home Loan Bank (FHLB) stock 24,381   24,450      
Derivative Assets 9,558   20,502      
Servicing Assets 13,655   13,801      
Liabilities, Fair Value Disclosure [Abstract]            
Derivative liabilities 13,617   14,937      
Assets,Carrying Value [Abstract]            
Total cash and cash equivalents 596,485   621,269 743,843   855,235
Restricted Cash And Cash Equivalents 15,170   82,199      
Securities Purchased under Agreements to Resell 0   60,000      
Trading Securities 1,613   1,869      
Non-covered loans 4,586,904   4,615,929      
Covered, net 334,344   356,961      
FDIC Indemnification Asset 143,660 166,194 189,240 253,379 283,124 302,295
Accrued interest receivable 22,508   18,734      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 5,141,233   5,383,265      
Securities Sold under Agreements to Repurchase 1,012,233   1,267,618      
Subordinated capital notes 100,797   100,010      
Accrued expenses and other liabilities 135,405   144,424      
Fair Value, Inputs, Level 1 [Member]
            
Assets, Fair Value Disclosure [Abstract]            
Cash and Cash Equivalents, Fair Value Disclosure 596,485   621,269      
Restricted Cash, at Fair Value 15,170   82,199      
Assets,Carrying Value [Abstract]            
Total cash and cash equivalents 596,485   621,269      
Restricted Cash And Cash Equivalents 15,170   82,199      
Fair Value, Inputs, Level 2 [Member]
            
Assets, Fair Value Disclosure [Abstract]            
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure 0   60,000      
Available-for-sale Securities 1,418,958   1,568,745      
Federal Home Loan Bank (FHLB) stock 24,381   24,450      
Derivative Assets 2,978   4,072      
Receivables, Fair Value Disclosure 13,617   14,937      
Assets,Carrying Value [Abstract]            
Securities Purchased under Agreements to Resell 0   60,000      
Trading Securities 1,613   1,869      
Investment securities AFS , carrying value 1,418,958   1,568,745      
Federal Home Loan Bank Stock at carrying value 24,381   24,450      
Derivative Assets, carrying value 2,978   4,072      
Liabilities,Carrying Value Disclosure [Abstract]            
Derivative liabilities at carrying value 13,617   14,937      
Fair Value, Inputs, Level 3 [Member]
            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities 0   19,680      
Non-covered loans, net 4,527,811   4,857,505      
Covered loans, net 397,262   459,444      
Derivative Assets 6,580   16,430      
FDIC Indemnification Asset Fair Value Disclosure 94,653   152,965      
Receivables, Fair Value Disclosure 22,508   18,734      
Servicing Assets 13,655   13,801      
Liabilities, Fair Value Disclosure [Abstract]            
Deposits, Fair Value Disclosure 5,076,996   5,409,540      
Securities sold under agreements to repurchase 1,065,181   1,323,903      
Advances from FHLB 365,808   335,324      
Notes Payable Fair Value Disclosure 3,741   3,638      
Subordinated capital notes 88,243   99,316      
Accrued expenses and other liabilities 135,406   144,424      
Assets,Carrying Value [Abstract]            
Investment securities AFS , carrying value 0   19,680      
Non-covered loans 4,601,696   4,662,458      
Covered, net 334,344   356,961      
Derivative Assets, carrying value 6,580   16,430      
FDIC Indemnification Asset 143,660   189,240      
Accrued interest receivable 22,508   18,734      
Servicing assets, carrying value 13,655   13,801      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 5,141,233   5,383,265      
Securities Sold under Agreements to Repurchase 1,012,233   1,267,618      
Advances from FHLB 360,240   336,143      
Term Notes 3,837   3,663      
Subordinated capital notes 100,797   100,010      
Accrued expenses and other liabilities $ 135,406   $ 144,424