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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities $ 751,484 $ 974,609    
Held to maturity Fair Value 592,763 614,679    
Federal Home Loan Bank (FHLB) stock 10,793 20,783    
Other Investments 3 3    
Derivative Assets 1,330 3,025    
Servicing Assets 9,858 7,455 $ 13,992 $ 13,801
Liabilities, Fair Value Disclosure [Abstract]        
Derivative Liabilities Current 2,437 7,257    
Assets,Carrying Value [Abstract]        
Restricted Cash And Cash Equivalents 3,030 3,349    
Trading Securities 347 288    
Investment held for sale, carrying amount 599,884 620,189    
Loans, net of allowance for loan and lease losses 4,129,427 4,416,396    
FDIC Indemnification Asset 14,411 22,599 $ 97,378 $ 189,240
Accrued interest receivable 20,227 20,637    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 4,664,487 4,717,751    
Securities Sold under Agreements to Repurchase 653,756 934,691    
Subordinated capital notes 36,083 102,633    
Accrued expenses and other liabilities 95,370 92,043    
Fair Value, Inputs, Level 1 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Cash and Cash Equivalents, Fair Value Disclosure 510,439 536,709    
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 Current 0 0    
Assets,Carrying Value [Abstract]        
Cash and Cash Equivalents, at Carrying Value 510,439 536,709    
Restricted Cash And Cash Equivalents 3,030 3,349    
Trading Securities 0 0    
Fair Value, Inputs, Level 2 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Trading Securities 347 288    
Available-for-sale Securities 751,484 974,609    
Held to maturity Fair Value 592,763 614,679    
Federal Home Loan Bank (FHLB) stock 10,793 20,783    
Other Investments 3 3    
Derivative Assets 1,330 1,855    
Receivables, Fair Value Disclosure 2,437 6,162    
Servicing Assets 0 0    
Liabilities, Fair Value Disclosure [Abstract]        
Derivative Liabilities Current 2,437 6,162    
Assets,Carrying Value [Abstract]        
Trading Securities 347 288    
Investment securities AFS , carrying value 751,484 974,609    
Investment held for sale, carrying amount 599,884 620,189    
Federal Home Loan Bank Stock at carrying value 10,793 20,783    
Other Investment, Carrying Value 3 3    
Derivative Assets, carrying value 1,330 1,855    
Fair Value, Inputs, Level 3 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities 0 0    
Loans Including HFS Fair Value 3,917,340 4,101,219    
Derivative Assets 0 1,170    
FDIC Indemnification Asset Fair Value Disclosure 8,669 17,786    
Receivables, Fair Value Disclosure 20,227 20,637    
Servicing Assets 9,858 7,455    
Account Receivable and Other assets, Fair Value 46,518 42,786    
Liabilities, Fair Value Disclosure [Abstract]        
Deposits, Fair Value Disclosure 4,644,629 4,705,878    
Securities sold under agreements to repurchase 651,898 955,859    
Advances from FHLB 106,422 335,812    
Other Borrowings 61 2,593    
Subordinated capital notes 30,230 94,940    
Derivative Liabilities Current 0 1,095    
Accrued expenses and other liabilities 95,370 92,043    
Assets,Carrying Value [Abstract]        
Trading Securities 0 0    
Loans, net of allowance for loan and lease losses 4,147,692 4,434,213    
Derivative Assets, carrying value 0 1,170    
FDIC Indemnification Asset 14,411 22,599    
Accrued interest receivable 20,227 20,637    
Servicing assets, carrying value 9,858 7,455    
Account receivable and oher assets, carrying value 46,518 42,786    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 4,664,487 4,716,656    
Securities Sold under Agreements to Repurchase 653,756 934,691    
Advances from FHLB 105,454 332,476    
Other Borrowings 61 1,734    
Subordinated capital notes 36,083 102,633    
Accrued expenses and other liabilities 95,370 92,043    
Derivative liabilities, carrying value $ 0 $ 1,095