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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract]        
Cash and Cash Equivalents, Fair Value Disclosure $ 362,358 $ 485,203    
Restricted Cash, at Fair Value 3,030 3,030    
Trading Securities 293 191    
Available-for-sale Securities 801,641 645,797    
Held to maturity Fair Value 467,980 497,681    
Federal Home Loan Bank (FHLB) stock 11,499 13,995    
Other Investments 3 3    
Loans Including HFS Fair Value 3,735,449 3,842,907    
Derivative Assets 898 771    
Receivables, Fair Value Disclosure 35,141 49,969    
Servicing Assets 10,533 9,821    
Account Receivable and Other assets, Fair Value 35,515 41,898    
Liabilities, Fair Value Disclosure [Abstract]        
Deposits, Fair Value Disclosure 4,767,479 4,782,197    
Securities sold under agreements to repurchase 271,811 191,104    
Advances from FHLB 43,880 99,509    
Other Borrowings 394 153    
Subordinated capital notes 34,158 33,080    
Derivative Liabilities Current 752 1,281    
Accrued expenses and other liabilities 85,886 86,791    
Assets,Carrying Value [Abstract]        
Cash and Cash Equivalents, at Carrying Value 362,358 485,203    
Restricted Cash And Cash Equivalents 3,030 3,030    
Trading Securities 293 191    
Investment securities AFS , carrying value 801,641 645,797    
Investment held for sale, carrying amount 485,143 506,064    
Federal Home Loan Bank Stock at carrying value 11,499 13,995    
Other Investment, Carrying Value 3 3    
Loans, net of allowance for loan and lease losses 4,115,799 4,037,362    
Derivative Assets, carrying value 898 771    
FDIC Indemnification Asset 0 0 $ 0 $ 14,411
Accrued interest receivable 35,141 49,969    
Servicing assets, carrying value 10,533 9,821    
Account receivable and oher assets, carrying value 35,515 41,898    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 4,833,428 4,799,482    
Securities Sold under Agreements to Repurchase 273,926 192,869    
Advances from FHLB 43,934 99,643    
Other Borrowings 394 153    
Subordinated capital notes 36,083 36,083    
Accrued expenses and other liabilities 85,886 86,791    
Derivative liabilities, carrying value 752 1,281    
Fair Value, Inputs, Level 1 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Cash and Cash Equivalents, Fair Value Disclosure 362,358 485,203    
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 362,358 485,203    
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 293 191    
Available-for-sale Securities 801,641 645,797    
Held to maturity Fair Value 467,980 497,681    
Federal Home Loan Bank (FHLB) stock 11,499 13,995    
Other Investments 3 3    
Derivative Assets 898 771    
Servicing Assets 0 0    
Liabilities, Fair Value Disclosure [Abstract]        
Derivative Liabilities Current 752 1,281    
Assets,Carrying Value [Abstract]        
Trading Securities 293 191    
Investment securities AFS , carrying value 801,641 645,797    
Investment held for sale, carrying amount 485,143 506,064    
Federal Home Loan Bank Stock at carrying value 11,499 13,995    
Other Investment, Carrying Value 3 3    
Derivative Assets, carrying value 898 771    
Liabilities,Carrying Value Disclosure [Abstract]        
Derivative liabilities, carrying value 752 1,281    
Fair Value, Inputs, Level 3 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities 0 0    
Loans Including HFS Fair Value 3,735,449 3,842,907    
Derivative Assets 0 0    
Receivables, Fair Value Disclosure 35,141 49,969    
Servicing Assets 10,533 9,821    
Account Receivable and Other assets, Fair Value 35,515 41,898    
Liabilities, Fair Value Disclosure [Abstract]        
Deposits, Fair Value Disclosure 4,767,479 4,782,197    
Securities sold under agreements to repurchase 271,811 191,104    
Advances from FHLB 43,880 99,509    
Other Borrowings 394 153    
Subordinated capital notes 34,158 33,080    
Derivative Liabilities Current 0 0    
Accrued expenses and other liabilities 85,886 86,791    
Assets,Carrying Value [Abstract]        
Trading Securities 0 0    
Loans, net of allowance for loan and lease losses 4,133,429 4,056,329    
Accrued interest receivable 35,141 49,969    
Servicing assets, carrying value 10,533 9,821    
Account receivable and oher assets, carrying value 35,515 41,898    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 4,833,428 4,799,482    
Securities Sold under Agreements to Repurchase 273,926 192,869    
Advances from FHLB 43,934 99,643    
Other Borrowings 394 153    
Subordinated capital notes 36,083 36,083    
Accrued expenses and other liabilities $ 85,886 $ 86,791