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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Assets, Fair Value Disclosure [Abstract]            
Cash and Cash Equivalents, Fair Value Disclosure $ 720,726   $ 510,439      
Restricted Cash, at Fair Value 3,030   3,030      
Trading Securities 284   347      
Available-for-sale Securities 613,423   751,484      
Held to maturity Fair Value 525,830   592,763      
Federal Home Loan Bank (FHLB) stock 14,016   10,793      
Other Investments 3   3      
Loans Including HFS Fair Value 3,854,106   3,917,340      
Derivative Assets 809   1,330      
FDIC Indemnification Asset Fair Value Disclosure 0   8,669      
Receivables, Fair Value Disclosure 22,736   20,227      
Servicing Assets 9,818   9,858      
Account Receivable and Other assets, Fair Value 37,443   46,525      
Liabilities, Fair Value Disclosure [Abstract]            
Deposits, Fair Value Disclosure 4,809,945   4,644,629      
Securities sold under agreements to repurchase 281,786   651,898      
Advances from FHLB 100,249   106,422      
Other Borrowings 0   61      
Subordinated capital notes 31,938   30,230      
Derivative Liabilities Current 1,677   2,437      
Accrued expenses and other liabilities 86,766   95,370      
Assets,Carrying Value [Abstract]            
Cash and Cash Equivalents, at Carrying Value 720,726   510,439      
Restricted Cash And Cash Equivalents 3,030   3,030      
Trading Securities 284   347      
Investment securities AFS , carrying value 613,423   751,484      
Investment held for sale, carrying amount 530,178   599,884      
Federal Home Loan Bank Stock at carrying value 14,016   10,793      
Other Investment, Carrying Value 3   3      
Loans, net of allowance for loan and lease losses 3,945,866   4,129,427      
Derivative Assets, carrying value 809   1,330      
FDIC Indemnification Asset 0 $ 0 14,411 $ 16,670 $ 18,426 $ 22,599
Accrued interest receivable 22,736   20,227      
Servicing assets, carrying value 9,818   9,858      
Account receivable and oher assets, carrying value 37,443   46,525      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 4,826,404   4,664,487      
Securities Sold under Agreements to Repurchase 283,080   653,756      
Advances from FHLB 100,091   105,454      
Other Borrowings 0   61      
Subordinated capital notes 36,083   36,083      
Accrued expenses and other liabilities 86,766   95,370      
Derivative liabilities, carrying value 1,677          
Fair Value, Inputs, Level 1 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Cash and Cash Equivalents, Fair Value Disclosure 720,726   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 720,726   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 284   347      
Available-for-sale Securities 613,423   751,484      
Held to maturity Fair Value 525,830   592,763      
Federal Home Loan Bank (FHLB) stock 14,016   10,793      
Other Investments 3   3      
Derivative Assets 809   1,330      
Servicing Assets 0   0      
Liabilities, Fair Value Disclosure [Abstract]            
Derivative Liabilities Current 1,677   2,437      
Assets,Carrying Value [Abstract]            
Trading Securities 284   347      
Investment securities AFS , carrying value 613,423   751,484      
Investment held for sale, carrying amount 530,178   599,884      
Federal Home Loan Bank Stock at carrying value 14,016   10,793      
Other Investment, Carrying Value 3   3      
Derivative Assets, carrying value 809   1,330      
Liabilities,Carrying Value Disclosure [Abstract]            
Derivative liabilities, carrying value 1,677   2,437      
Fair Value, Inputs, Level 3 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities 0   0      
Loans Including HFS Fair Value 3,854,106   3,917,340      
Derivative Assets 0   0      
FDIC Indemnification Asset Fair Value Disclosure 0   8,669      
Receivables, Fair Value Disclosure 22,736   20,227      
Servicing Assets 9,818   9,858      
Account Receivable and Other assets, Fair Value 37,443   46,525      
Liabilities, Fair Value Disclosure [Abstract]            
Deposits, Fair Value Disclosure 4,809,945   4,644,629      
Securities sold under agreements to repurchase 281,786   651,898      
Advances from FHLB 100,249   106,422      
Other Borrowings 0   61      
Subordinated capital notes 31,938   30,230      
Derivative Liabilities Current 0          
Accrued expenses and other liabilities 86,766   95,370      
Assets,Carrying Value [Abstract]            
Trading Securities 0   0      
Loans, net of allowance for loan and lease losses 3,964,572   4,147,692      
FDIC Indemnification Asset 0   14,411      
Accrued interest receivable 22,736   20,227      
Servicing assets, carrying value 9,818   9,858      
Account receivable and oher assets, carrying value 37,443   46,525      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 4,826,404   4,664,487      
Securities Sold under Agreements to Repurchase 283,080   653,756      
Advances from FHLB 100,091   105,454      
Other Borrowings 0   61      
Subordinated capital notes 36,083   36,083      
Accrued expenses and other liabilities $ 86,766   $ 95,370