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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities $ 669,285,000 $ 974,609,000    
Held to maturity Fair Value 641,346,000 614,679,000    
Federal Home Loan Bank (FHLB) stock 20,761,000 20,783,000    
Other Investments 3,000 3,000    
Derivative Assets 2,662,000 3,025,000    
Servicing Assets 7,819,000 7,455,000 $ 12,164,000 $ 13,992,000
Liabilities, Fair Value Disclosure [Abstract]        
Derivative liabilities 6,220,000 6,162,000    
Assets,Carrying Value [Abstract]        
Total cash and cash equivalents 677,849,000 536,709,000 678,902,000 573,427,000
Restricted Cash And Cash Equivalents 3,349,000 3,349,000    
Trading Securities, held to maturity 314,000 288,000    
Loans, net of allowance for loan and lease losses 4,338,614,000 4,416,396,000    
Carrying amount, net 1,062,957,000 1,123,435,000    
FDIC Indemnification Asset 20,923,000 22,599,000 $ 75,221,000 $ 97,378,000
Accrued interest receivable 18,392,000 20,637,000    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 4,779,693,000 4,717,751,000    
Securities Sold under Agreements to Repurchase 636,172,000 934,691,000    
Subordinated capital notes 102,808,000 102,633,000    
Accrued expenses and other liabilities 92,761,000 92,043,000    
Fair Value, Inputs, Level 1 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Cash and Cash Equivalents, Fair Value Disclosure 677,849,000 536,710,000    
Restricted Cash, at Fair Value 3,349,000 3,349,000    
Available-for-sale Securities 0 0    
Derivative Assets 0 0    
Servicing Assets 0 0    
Assets,Carrying Value [Abstract]        
Restricted Cash And Cash Equivalents 3,349,000 3,349,000    
Trading Securities, held to maturity   0    
Fair Value, Inputs, Level 2 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities 669,285,000 974,609,000    
Held to maturity Fair Value 641,346,000 614,679,000    
Federal Home Loan Bank (FHLB) stock 20,761,000 20,783,000    
Other Investments 3,000 3,000    
Derivative Assets 1,890,000 1,854,000    
Accrued interest receivable 6,220,000 6,162,000    
Servicing Assets 0 0    
Assets,Carrying Value [Abstract]        
Trading Securities, held to maturity 314,000 288,000    
Investment held for sale, carrying amount 637,036,000 620,189,000    
Federal Home Loan Bank Stock at carrying value 20,761,000 20,783,000    
Other Investment, Carrying Value 3,000 3,000    
Derivative Assets, carrying value 1,890,000 1,855,000    
Liabilities,Carrying Value Disclosure [Abstract]        
Derivative liabilities at carrying value 6,220,000 6,162,000    
Fair Value, Inputs, Level 3 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities 0 0    
Non-covered loans, net 4,088,158,000 4,101,219,000    
Derivative Assets 772,000 1,171,000    
FDIC Indemnification Asset Fair Value Disclosure 10,897,000 17,786,000    
Accrued interest receivable 18,392,000 20,637,000    
Servicing Assets 7,819,000 7,455,000    
Liabilities, Fair Value Disclosure [Abstract]        
Deposits, Fair Value Disclosure 4,772,507,000 4,705,878,000    
Securities sold under agreements to repurchase 645,098,000 955,859,000    
Advances from FHLB 334,782,000 335,812,000    
Notes Payable Fair Value Disclosure 2,661,000 2,593,000    
Subordinated capital notes 97,330,000 94,940,000    
Accrued expenses and other liabilities 92,761,000 92,935,000    
Assets,Carrying Value [Abstract]        
Trading Securities, held to maturity   0    
Loans, net of allowance for loan and lease losses 4,360,129,000 4,434,213,000    
Derivative Assets, carrying value 772,000 1,170,000    
FDIC Indemnification Asset 20,923,000 22,599,000    
Accrued interest receivable 18,392,000 20,637,000    
Servicing assets, carrying value 7,819,000 7,455,000    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 4,778,947,000 4,715,764,000    
Securities Sold under Agreements to Repurchase 636,172,000 934,691,000    
Advances from FHLB 331,980,000 332,476,000    
Term Notes 1,756,000 1,734,000    
Subordinated capital notes 102,808,000 102,633,000    
Accrued expenses and other liabilities 92,761,000 92,935,000    
Derivative liabilities at carrying value $ 746,000 $ 1,095,000