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Fair Value of Financial Instruments (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Assets, Fair Value Disclosure [Abstract]      
Available-for-sale Securities $ 1,239,469 $ 841,857  
Held to maturity Fair Value 0 410,353  
Federal Home Loan Bank (FHLB) stock 12,800 12,644  
Other Investments 3 3  
Derivative Assets 110 347  
Servicing Assets 10,623 10,716  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liabilities Current 439 333  
Assets,Carrying Value [Abstract]      
Restricted Cash And Cash Equivalents 3,030 3,030 $ 3,030
Trading Securities 381 360  
Accrued interest receivable 33,152 34,254  
Liabilities,Carrying Value Disclosure [Abstract]      
Deposits, Total 4,897,101 4,908,115  
Securities Sold under Agreements to Repurchase 431,566 455,508  
Subordinated capital notes 36,083 36,083  
Accrued expenses and other liabilities 87,004 87,665  
Fair Value, Inputs, Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Cash and Cash Equivalents, Fair Value Disclosure 505,993 447,033  
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 505,993 447,033  
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 381 360  
Available-for-sale Securities 1,239,469 841,857  
Held to maturity Fair Value 0 410,353  
Federal Home Loan Bank (FHLB) stock 12,800 12,644  
Other Investments 3 3  
Derivative Assets 110 347  
Servicing Assets 0 0  
Liabilities, Fair Value Disclosure [Abstract]      
Derivative Liabilities Current 439 333  
Assets,Carrying Value [Abstract]      
Trading Securities 381 360  
Investment securities AFS , carrying value 1,239,469 841,857  
Investment held for sale, carrying amount 0 424,740  
Federal Home Loan Bank Stock at carrying value 12,800 12,644  
Other Investment, Carrying Value 3 3  
Derivative Assets, carrying value 110 347  
Liabilities,Carrying Value Disclosure [Abstract]      
Derivative liabilities, carrying value 439 333  
Fair Value, Inputs, Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Available-for-sale Securities 0 0  
Loans Including HFS Fair Value 4,074,348 4,106,628  
Derivative Assets 0 0  
Receivables, Fair Value Disclosure 33,152 34,254  
Servicing Assets 10,623 10,716  
Account Receivable and Other assets, Fair Value 35,482 37,842  
Liabilities, Fair Value Disclosure [Abstract]      
Deposits, Fair Value Disclosure 4,868,473 4,881,903  
Securities sold under agreements to repurchase 429,250 453,135  
Advances from FHLB 81,366 78,503  
Other Borrowings 286 1,214  
Subordinated capital notes 35,458 36,184  
Derivative Liabilities Current 0 0  
Accrued expenses and other liabilities 87,004 87,664  
Assets,Carrying Value [Abstract]      
Trading Securities 0 0  
Loans, net of allowance for loan and lease losses 4,401,401 4,431,594  
Accrued interest receivable 33,152 34,254  
Servicing assets, carrying value 10,623 10,716  
Account receivable and oher assets, carrying value 35,482 37,842  
Liabilities,Carrying Value Disclosure [Abstract]      
Deposits, Total 4,897,101 4,908,115  
Securities Sold under Agreements to Repurchase 431,566 455,508  
Advances from FHLB 81,111 77,620  
Other Borrowings 286 1,214  
Subordinated capital notes 36,083 36,083  
Accrued expenses and other liabilities $ 87,004 $ 87,664