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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Assets, Fair Value Disclosure [Abstract]            
Trading Securities $ 348   $ 288      
Available-for-sale Securities 664,302   974,609      
Held to maturity Fair Value 643,530   614,679      
Federal Home Loan Bank (FHLB) stock 19,838   20,783      
Other Investments 3   3      
Derivative Assets 1,926   3,025      
Servicing Assets 7,932   7,455      
Liabilities, Fair Value Disclosure [Abstract]            
Derivative liabilities 5,413   6,162      
Assets,Carrying Value [Abstract]            
Total cash and cash equivalents 517,048   536,709 $ 553,535   $ 573,427
Restricted Cash And Cash Equivalents 3,030   3,349      
Trading Securities 348   288      
Investment securities AFS , carrying value 664,302   974,609      
Loans, net of allowance for loan and lease losses 4,350,789   4,416,396      
Carrying amount, net 1,015,702   1,123,435      
FDIC Indemnification Asset 18,426 $ 20,923 22,599 $ 22,704 $ 75,221 $ 97,378
Accrued interest receivable 20,009   20,637      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 4,644,054   4,717,751      
Securities Sold under Agreements to Repurchase 626,109   934,691      
Subordinated capital notes 102,983   102,633      
Accrued expenses and other liabilities 88,930   92,043      
Derivative liabilities at carrying value 5,413   6,162      
Fair Value, Inputs, Level 1 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Cash and Cash Equivalents, Fair Value Disclosure 517,048   536,709      
Restricted Cash, at Fair Value 3,030   3,349      
Available-for-sale Securities 0   0      
Derivative Assets 0   0      
Servicing Assets 0   0      
Liabilities, Fair Value Disclosure [Abstract]            
Derivative liabilities     0      
Assets,Carrying Value [Abstract]            
Restricted Cash And Cash Equivalents 3,030   3,349      
Trading Securities     0      
Fair Value, Inputs, Level 2 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Trading Securities 348   288      
Available-for-sale Securities 664,302   974,609      
Held to maturity Fair Value 643,530   614,679      
Federal Home Loan Bank (FHLB) stock 19,838   20,783      
Other Investments 3   3      
Derivative Assets 1,739   1,855      
Receivables, Fair Value Disclosure     20,637      
Servicing Assets 0   0      
Liabilities, Fair Value Disclosure [Abstract]            
Derivative liabilities 5,413   6,162      
Assets,Carrying Value [Abstract]            
Trading Securities 348   288      
Investment securities AFS , carrying value 664,302   974,609      
Investment held for sale, carrying amount 635,399   620,189      
Federal Home Loan Bank Stock at carrying value 19,838   20,783      
Other Investment, Carrying Value 3   3      
Derivative Assets, carrying value 1,739   1,855      
Liabilities,Carrying Value Disclosure [Abstract]            
Derivative liabilities at carrying value 5,413   6,162      
Fair Value, Inputs, Level 3 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities 0   0      
Non-covered loans, net 4,163,769   4,101,219      
Derivative Assets 187   1,170      
FDIC Indemnification Asset Fair Value Disclosure 11,064   17,786      
Receivables, Fair Value Disclosure 20,009   20,637      
Servicing Assets 7,932   7,455      
Liabilities, Fair Value Disclosure [Abstract]            
Deposits, Fair Value Disclosure 4,633,864   4,705,878      
Securities sold under agreements to repurchase 630,933   955,859      
Advances from FHLB 308,583   335,812      
Notes Payable Fair Value Disclosure 2,599   2,593      
Subordinated capital notes 98,944   94,940      
Accrued expenses and other liabilities 88,930   92,935      
Assets,Carrying Value [Abstract]            
Trading Securities     0      
Loans, net of allowance for loan and lease losses 4,373,617   4,434,213      
Derivative Assets, carrying value 187   1,170      
FDIC Indemnification Asset 18,426   22,599      
Accrued interest receivable 20,009   20,637      
Servicing assets, carrying value 7,932   7,455      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 4,643,873   4,715,764      
Securities Sold under Agreements to Repurchase 626,109   934,691      
Advances from FHLB 306,480   332,476      
Term Notes 1,753   1,734      
Subordinated capital notes 102,983   102,633      
Accrued expenses and other liabilities 88,930   92,935      
Derivative liabilities at carrying value $ 181   $ 1,095