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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Assets, Fair Value Disclosure [Abstract]            
Cash and Cash Equivalents, Fair Value Disclosure $ 477,308   $ 510,439      
Restricted Cash, at Fair Value 3,030   3,030      
Trading Securities 294   347      
Available-for-sale Securities 649,327   751,484      
Held to maturity Fair Value 549,595   592,763      
Federal Home Loan Bank (FHLB) stock 16,616   10,793      
Other Investments 3   3      
Loans Including HFS Fair Value 3,955,910   3,917,340      
Derivative Assets 957   1,330      
FDIC Indemnification Asset Fair Value Disclosure 0   8,669      
Servicing Assets 9,866   9,858      
Account Receivable and Other assets, Fair Value 33,162   46,525      
Liabilities, Fair Value Disclosure [Abstract]            
Deposits, Fair Value Disclosure 4,560,586   4,644,629      
Securities sold under agreements to repurchase 451,933   651,898      
Advances from FHLB 138,002   106,422      
Other Borrowings 177   61      
Subordinated capital notes 31,743   30,230      
Derivative Liabilities Current 1,881   2,437      
Accrued expenses and other liabilities 62,259   95,370      
Assets,Carrying Value [Abstract]            
Cash and Cash Equivalents, at Carrying Value 477,308   510,439      
Restricted Cash And Cash Equivalents 3,030   3,030      
Trading Securities 294   347      
Investment securities AFS , carrying value 649,327   751,484      
Investment held for sale, carrying amount 555,407   599,884      
Federal Home Loan Bank Stock at carrying value 16,616   10,793      
Other Investment, Carrying Value 3   3      
Loans, net of allowance for loan and lease losses 4,037,601   4,129,427      
Derivative Assets, carrying value 957   1,330      
FDIC Indemnification Asset 0 $ 0 14,411 $ 18,426 $ 20,923 $ 22,599
Accrued interest receivable 19,798   20,227      
Servicing assets, carrying value 9,866   9,858      
Account receivable and oher assets, carrying value 33,162   46,525      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 4,582,686   4,664,487      
Securities Sold under Agreements to Repurchase 453,492   653,756      
Advances from FHLB 137,540   105,454      
Other Borrowings 177   61      
Subordinated capital notes 36,083   36,083      
Accrued expenses and other liabilities 62,259   95,370      
Derivative liabilities, carrying value 1,881          
Fair Value, Inputs, Level 1 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Cash and Cash Equivalents, Fair Value Disclosure 477,308   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 477,308   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 294   347      
Available-for-sale Securities 649,327   751,484      
Held to maturity Fair Value 549,595   592,763      
Federal Home Loan Bank (FHLB) stock 16,616   10,793      
Other Investments 3   3      
Derivative Assets 957   1,330      
Servicing Assets 0   0      
Liabilities, Fair Value Disclosure [Abstract]            
Derivative Liabilities Current 1,881   2,437      
Assets,Carrying Value [Abstract]            
Trading Securities 294   347      
Investment securities AFS , carrying value 649,327   751,484      
Investment held for sale, carrying amount 555,407   599,884      
Federal Home Loan Bank Stock at carrying value 16,616   10,793      
Other Investment, Carrying Value 3   3      
Derivative Assets, carrying value 957   1,330      
Liabilities,Carrying Value Disclosure [Abstract]            
Derivative liabilities, carrying value 1,881          
Fair Value, Inputs, Level 3 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities 0   0      
Loans Including HFS Fair Value 3,955,910   3,917,340      
Derivative Assets 0   0      
FDIC Indemnification Asset Fair Value Disclosure 0   8,669      
Receivables, Fair Value Disclosure 19,798   20,227      
Servicing Assets 9,866   9,858      
Account Receivable and Other assets, Fair Value 33,162   46,525      
Liabilities, Fair Value Disclosure [Abstract]            
Deposits, Fair Value Disclosure 4,560,586   4,644,629      
Securities sold under agreements to repurchase 451,933   651,898      
Advances from FHLB 138,002   106,422      
Other Borrowings 177   61      
Subordinated capital notes 31,743   30,230      
Derivative Liabilities Current 0          
Accrued expenses and other liabilities 62,259   95,370      
Assets,Carrying Value [Abstract]            
Trading Securities 0   0      
Loans, net of allowance for loan and lease losses 4,091,866   4,147,692      
FDIC Indemnification Asset 0   14,411      
Accrued interest receivable 19,798   20,227      
Servicing assets, carrying value 9,866   9,858      
Account receivable and oher assets, carrying value 33,162   46,525      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 4,582,686   4,664,487      
Securities Sold under Agreements to Repurchase 453,492   653,756      
Advances from FHLB 137,540   105,454      
Other Borrowings 177   61      
Subordinated capital notes 36,083   36,083      
Accrued expenses and other liabilities $ 62,259   $ 95,370