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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]    
Cash and Cash Equivalents, Fair Value Disclosure $ 375,335 $ 485,203
Restricted Cash, at Fair Value 3,030 3,030
Trading Securities 418 191
Available-for-sale Securities 872,341 645,797
Held to maturity Fair Value 447,947 497,681
Federal Home Loan Bank (FHLB) stock 14,919 13,995
Other Investments 3 3
Loans Including HFS Fair Value 3,897,042 3,842,907
Derivative Assets 1,100 771
Receivables, Fair Value Disclosure 34,476 49,969
Servicing Assets 10,829 9,821
Account Receivable and Other assets, Fair Value 35,693 41,898
Liabilities, Fair Value Disclosure [Abstract]    
Deposits, Fair Value Disclosure 4,850,971 4,782,197
Securities sold under agreements to repurchase 385,430 191,104
Advances from FHLB 127,994 99,509
Other Borrowings 299 153
Subordinated capital notes 33,784 33,080
Derivative Liabilities Current 679 1,281
Accrued expenses and other liabilities 80,019 86,791
Assets,Carrying Value [Abstract]    
Cash and Cash Equivalents, at Carrying Value 375,335 485,203
Restricted Cash And Cash Equivalents 3,030 3,030
Trading Securities 418 191
Investment securities AFS , carrying value 872,341 645,797
Investment held for sale, carrying amount 465,427 506,064
Federal Home Loan Bank Stock at carrying value 14,919 13,995
Other Investment, Carrying Value 3 3
Loans, net of allowance for loan and lease losses 4,298,623 4,037,362
Derivative Assets, carrying value 1,100 771
FDIC Indemnification Asset 0 0
Accrued interest receivable 34,476 49,969
Servicing assets, carrying value 10,829 9,821
Account receivable and oher assets, carrying value 35,693 41,898
Liabilities,Carrying Value Disclosure [Abstract]    
Deposits, Total 4,880,201 4,799,482
Securities Sold under Agreements to Repurchase 387,770 192,869
Advances from FHLB 128,114 99,643
Other Borrowings 299 153
Subordinated capital notes 36,083 36,083
Accrued expenses and other liabilities 80,019 86,791
Derivative liabilities, carrying value 679 1,281
Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash and Cash Equivalents, Fair Value Disclosure 375,335 485,203
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 375,335 485,203
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 418 191
Available-for-sale Securities 872,341 645,797
Held to maturity Fair Value 447,947 497,681
Federal Home Loan Bank (FHLB) stock 14,919 13,995
Other Investments 3 3
Derivative Assets 1,100 771
Servicing Assets 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative Liabilities Current 679 1,281
Assets,Carrying Value [Abstract]    
Trading Securities 418 191
Investment securities AFS , carrying value 872,341 645,797
Investment held for sale, carrying amount 465,427 506,064
Federal Home Loan Bank Stock at carrying value 14,919 13,995
Other Investment, Carrying Value 3 3
Derivative Assets, carrying value 1,100 771
Liabilities,Carrying Value Disclosure [Abstract]    
Derivative liabilities, carrying value 679 1,281
Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities 0 0
Loans Including HFS Fair Value 3,897,042 3,842,907
Derivative Assets 0 0
Receivables, Fair Value Disclosure 34,476 49,969
Servicing Assets 10,829 9,821
Account Receivable and Other assets, Fair Value 35,693 41,898
Liabilities, Fair Value Disclosure [Abstract]    
Deposits, Fair Value Disclosure 4,850,971 4,782,197
Securities sold under agreements to repurchase 385,430 191,104
Advances from FHLB 127,994 99,509
Other Borrowings 299 153
Subordinated capital notes 33,784 33,080
Derivative Liabilities Current 0 0
Accrued expenses and other liabilities 80,019 86,791
Assets,Carrying Value [Abstract]    
Trading Securities 0 0
Loans, net of allowance for loan and lease losses 4,315,866 4,056,329
Accrued interest receivable 34,476 49,969
Servicing assets, carrying value 10,829 9,821
Account receivable and oher assets, carrying value 35,693 41,898
Liabilities,Carrying Value Disclosure [Abstract]    
Deposits, Total 4,880,201 4,799,482
Securities Sold under Agreements to Repurchase 387,770 192,869
Advances from FHLB 128,114 99,643
Other Borrowings 299 153
Subordinated capital notes 36,083 36,083
Accrued expenses and other liabilities $ 80,019 $ 86,791