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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets, Fair Value Disclosure [Abstract]      
Available-for-sale Securities $ 800,042 $ 751,484  
Held to maturity Fair Value 570,963 592,763  
Federal Home Loan Bank (FHLB) stock 17,161 10,793  
Other Investments 3 3  
Derivative Assets 1,123 1,330  
Servicing Assets 9,688 9,858  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liabilities Current 1,967 2,437  
Assets,Carrying Value [Abstract]      
Restricted Cash And Cash Equivalents 3,030 3,030  
Trading Securities 314 347  
Investment held for sale, carrying amount 577,997 599,884  
Loans, net of allowance for loan and lease losses 4,067,407 4,129,427  
FDIC Indemnification Asset 0 14,411 $ 22,599
Accrued interest receivable 18,555 20,227  
Liabilities,Carrying Value Disclosure [Abstract]      
Deposits, Total 4,717,828 4,664,487  
Securities Sold under Agreements to Repurchase 531,179 653,756  
Subordinated capital notes 36,083 36,083  
Accrued expenses and other liabilities 66,700 95,370  
Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Cash and Cash Equivalents, Fair Value Disclosure 480,271 510,439  
Restricted Cash, at Fair Value 3,030 3,030  
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 480,271 510,439  
Restricted Cash And Cash Equivalents 3,030 3,030  
Trading Securities 0 0  
Fair Value, Inputs, Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Trading Securities 314 347  
Available-for-sale Securities 800,042 751,484  
Held to maturity Fair Value 570,963 592,763  
Federal Home Loan Bank (FHLB) stock 17,161 10,793  
Other Investments 3 3  
Derivative Assets 1,123 1,330  
Receivables, Fair Value Disclosure 1,967 2,437  
Servicing Assets 0 0  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liabilities Current 1,967 2,437  
Assets,Carrying Value [Abstract]      
Trading Securities 314 347  
Investment securities AFS , carrying value 800,042 751,484  
Investment held for sale, carrying amount 577,997 599,884  
Federal Home Loan Bank Stock at carrying value 17,161 10,793  
Other Investment, Carrying Value 3 3  
Derivative Assets, carrying value 1,123 1,330  
Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Available-for-sale Securities 0 0  
Loans Including HFS Fair Value 3,891,904 3,917,340  
Derivative Assets 0 0  
FDIC Indemnification Asset Fair Value Disclosure 0 8,669  
Receivables, Fair Value Disclosure 18,555 20,227  
Servicing Assets 9,688 9,858  
Account Receivable and Other assets, Fair Value 35,662 46,518  
Liabilities, Fair Value Disclosure [Abstract]      
Deposits, Fair Value Disclosure 4,700,821 4,644,629  
Securities sold under agreements to repurchase 527,032 651,898  
Advances from FHLB 105,671 106,422  
Other Borrowings 185 61  
Subordinated capital notes 30,710 30,230  
Derivative Liabilities Current 0    
Accrued expenses and other liabilities 66,700 95,370  
Assets,Carrying Value [Abstract]      
Trading Securities 0 0  
Loans, net of allowance for loan and lease losses 4,089,708 4,147,692  
FDIC Indemnification Asset 0 14,411  
Accrued interest receivable 18,555 20,227  
Servicing assets, carrying value 9,688 9,858  
Account receivable and oher assets, carrying value 35,662 46,518  
Liabilities,Carrying Value Disclosure [Abstract]      
Deposits, Total 4,717,828 4,664,487  
Securities Sold under Agreements to Repurchase 531,179 653,756  
Advances from FHLB 104,948 105,454  
Other Borrowings 185 61  
Subordinated capital notes 36,083 36,083  
Accrued expenses and other liabilities $ 66,700 $ 95,370