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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]    
Cash and Cash Equivalents, Fair Value Disclosure $ 543,750 $ 485,203
Restricted Cash, at Fair Value 3,030 3,030
Trading Securities 405 191
Available-for-sale Securities 848,552 645,797
Held to maturity Fair Value 425,066 497,681
Federal Home Loan Bank (FHLB) stock 12,461 13,995
Other Investments 3 3
Loans Including HFS Fair Value 4,016,912 3,842,907
Derivative Assets 1,265 771
Receivables, Fair Value Disclosure 33,452 49,969
Servicing Assets 10,866 9,821
Account Receivable and Other assets, Fair Value 37,951 41,898
Liabilities, Fair Value Disclosure [Abstract]    
Deposits, Fair Value Disclosure 5,057,209 4,782,197
Securities sold under agreements to repurchase 375,345 191,104
Advances from FHLB 74,331 99,509
Other Borrowings 192 153
Subordinated capital notes 33,369 33,080
Derivative Liabilities Current 622 1,281
Accrued expenses and other liabilities 80,448 86,791
Assets,Carrying Value [Abstract]    
Cash and Cash Equivalents, at Carrying Value 543,750 485,203
Restricted Cash And Cash Equivalents 3,030 3,030
Trading Securities 405 191
Investment securities AFS , carrying value 848,552 645,797
Investment held for sale, carrying amount 444,679 506,064
Federal Home Loan Bank Stock at carrying value 12,461 13,995
Other Investment, Carrying Value 3 3
Loans, net of allowance for loan and lease losses 4,336,445 4,037,362
Derivative Assets, carrying value 1,265 771
FDIC Indemnification Asset 0 0
Accrued interest receivable 33,452 49,969
Servicing assets, carrying value 10,866 9,821
Account receivable and oher assets, carrying value 37,951 41,898
Liabilities,Carrying Value Disclosure [Abstract]    
Deposits, Total 5,088,993 4,799,482
Securities Sold under Agreements to Repurchase 378,237 192,869
Advances from FHLB 73,531 99,643
Other Borrowings 192 153
Subordinated capital notes 36,083 36,083
Accrued expenses and other liabilities 80,448 86,791
Derivative liabilities, carrying value 622 1,281
Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Cash and Cash Equivalents, Fair Value Disclosure 543,750 485,203
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 543,750 485,203
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 405 191
Available-for-sale Securities 848,552 645,797
Held to maturity Fair Value 425,066 497,681
Federal Home Loan Bank (FHLB) stock 12,461 13,995
Other Investments 3 3
Derivative Assets 1,265 771
Servicing Assets 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative Liabilities Current 622 1,281
Assets,Carrying Value [Abstract]    
Trading Securities 405 191
Investment securities AFS , carrying value 848,552 645,797
Investment held for sale, carrying amount 444,679 506,064
Federal Home Loan Bank Stock at carrying value 12,461 13,995
Other Investment, Carrying Value 3 3
Derivative Assets, carrying value 1,265 771
Liabilities,Carrying Value Disclosure [Abstract]    
Derivative liabilities, carrying value 622 1,281
Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Available-for-sale Securities 0 0
Loans Including HFS Fair Value 4,016,912 3,842,907
Derivative Assets 0 0
Receivables, Fair Value Disclosure 33,452 49,969
Servicing Assets 10,866 9,821
Account Receivable and Other assets, Fair Value 37,951 41,898
Liabilities, Fair Value Disclosure [Abstract]    
Deposits, Fair Value Disclosure 5,057,209 4,782,197
Securities sold under agreements to repurchase 375,345 191,104
Advances from FHLB 74,331 99,509
Other Borrowings 192 153
Subordinated capital notes 33,369 33,080
Derivative Liabilities Current 0 0
Accrued expenses and other liabilities 80,448 86,791
Assets,Carrying Value [Abstract]    
Trading Securities 0 0
Loans, net of allowance for loan and lease losses 4,352,980 4,056,329
Accrued interest receivable 33,452 49,969
Servicing assets, carrying value 10,866 9,821
Account receivable and oher assets, carrying value 37,951 41,898
Liabilities,Carrying Value Disclosure [Abstract]    
Deposits, Total 5,088,993 4,799,482
Securities Sold under Agreements to Repurchase 378,237 192,869
Advances from FHLB 73,531 99,643
Other Borrowings 192 153
Subordinated capital notes 36,083 36,083
Accrued expenses and other liabilities $ 80,448 $ 86,791