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Fair value (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Assets, Fair Value Disclosure [Abstract]            
Trading Securities $ 380   $ 288      
Available-for-sale Securities 642,683   974,609      
Held to maturity Fair Value 650,023   614,679      
Federal Home Loan Bank (FHLB) stock 12,712   20,783      
Other Investments 3   3      
Derivative Assets 1,503   3,025      
Servicing Assets 8,393   7,455      
Assets,Carrying Value [Abstract]            
Cash and Cash Equivalents, at Carrying Value       $ 526,196 $ 526,196 $ 573,427
Restricted Cash And Cash Equivalents 3,030   3,349      
Trading Securities 380   288      
Investment securities AFS , carrying value 642,683   974,609      
Loans, net of allowance for loan and lease losses 4,144,045   4,416,396      
FDIC Indemnification Asset 16,670 $ 18,426 22,599 $ 22,895 $ 22,704 $ 97,378
Accrued interest receivable 17,966   20,637      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 4,754,771   4,717,751      
Securities Sold under Agreements to Repurchase 658,232   934,691      
Subordinated capital notes 36,083   102,633      
Accrued expenses and other liabilities 89,760   92,043      
Fair Value, Inputs, Level 1 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Cash and Cash Equivalents, Fair Value Disclosure 509,265   536,709      
Restricted Cash, at Fair Value 3,030   3,349      
Available-for-sale Securities 0   0      
Derivative Assets 0   0      
Servicing Assets 0   0      
Assets,Carrying Value [Abstract]            
Cash and Cash Equivalents, at Carrying Value 509,265   536,709      
Restricted Cash And Cash Equivalents 3,030   3,349      
Trading Securities     0      
Fair Value, Inputs, Level 2 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Trading Securities 380   288      
Available-for-sale Securities 642,683   974,609      
Held to maturity Fair Value 650,023   614,679      
Federal Home Loan Bank (FHLB) stock 12,712   20,783      
Other Investments 3   3      
Derivative Assets 1,503   1,853      
Servicing Assets 0   0      
Liabilities, Fair Value Disclosure [Abstract]            
Derivative Liabilities Current 4,306   6,162      
Assets,Carrying Value [Abstract]            
Trading Securities 380   288      
Investment securities AFS , carrying value 642,683   974,609      
Investment held for sale, carrying amount 641,890   620,189      
Federal Home Loan Bank Stock at carrying value 12,712   20,783      
Other Investment, Carrying Value 3   3      
Derivative Assets, carrying value 1,503   1,855      
Liabilities,Carrying Value Disclosure [Abstract]            
Derivative liabilities, carrying value 4,306   6,162      
Fair Value, Inputs, Level 3 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities 0   0      
Non-covered loans, net 4,041,684   4,101,219      
Derivative Assets 0   1,172      
FDIC Indemnification Asset Fair Value Disclosure 10,585   17,786      
Receivables, Fair Value Disclosure 17,966   20,637      
Servicing Assets 8,393   7,455      
Account Receivable and Other assets, Fair Value 49,733   42,786      
Liabilities, Fair Value Disclosure [Abstract]            
Deposits, Fair Value Disclosure 4,738,963   4,705,878      
Securities sold under agreements to repurchase 662,027   955,859      
Advances from FHLB 106,811   335,812      
Other Borrowings 40   2,593      
Subordinated capital notes 32,831   94,940      
Derivative Liabilities Current 0   1,095      
Accrued expenses and other liabilities 89,759   92,043      
Assets,Carrying Value [Abstract]            
Trading Securities     0      
Loans, net of allowance for loan and lease losses 4,298,965   4,434,213      
Derivative Assets, carrying value 0   1,170      
FDIC Indemnification Asset 16,670   22,599      
Accrued interest receivable 17,966   20,637      
Servicing assets, carrying value 8,393   7,455      
Account receivable and oher assets, carrying value 49,733   42,786      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 4,754,771   4,716,656      
Securities Sold under Agreements to Repurchase 658,232   934,691      
Advances from FHLB 105,944   332,476      
Other Borrowings 40   1,734      
Subordinated capital notes 36,083   102,633      
Accrued expenses and other liabilities 89,759   92,043      
Derivative liabilities, carrying value $ 0   $ 1,095