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Fair Value of Financial Instruments (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities $ 1,074,169 $ 841,857    
Held to maturity Fair Value 0 410,353    
Federal Home Loan Bank (FHLB) stock 13,048 12,644    
Other Investments 560 3    
Derivative Assets 6 347    
Servicing Assets 50,779 10,716 $ 9,821 $ 9,858
Assets,Carrying Value [Abstract]        
Restricted Cash And Cash Equivalents 1,450 3,030 3,030  
Trading Securities 37 360    
Loans held for investment, net of allowance for loan losses of $116,539 (December 31, 2018 - $164,231) 6,622,256 4,421,226    
FDIC Indemnification Asset 0 0 $ 0 $ 14,411
Accrued interest receivable 37,120 34,254    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 7,698,610 4,908,115    
Securities Sold under Agreements to Repurchase 190,274 455,508    
Subordinated capital notes 36,083 36,083    
Accrued expenses and other liabilities 185,660 87,665    
Fair Value, Inputs, Level 1 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Cash and Cash Equivalents, Fair Value Disclosure 851,307 447,033    
Restricted Cash, at Fair Value 1,450 3,030    
Assets,Carrying Value [Abstract]        
Cash and Cash Equivalents, at Carrying Value 851,307 447,033    
Restricted Cash And Cash Equivalents 1,450 3,030    
Fair Value, Inputs, Level 2 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Trading Securities 37 360    
Available-for-sale Securities 1,074,169 841,857    
Held to maturity Fair Value 0 410,353    
Federal Home Loan Bank (FHLB) stock 13,048 12,644    
Other Investments 560 3    
Derivative Assets 6 347    
Liabilities, Fair Value Disclosure [Abstract]        
Derivative Liabilities Current 913 333    
Assets,Carrying Value [Abstract]        
Trading Securities 37 360    
Investment securities AFS , carrying value 1,074,169 841,857    
Investment held for sale, carrying amount 0 424,740    
Federal Home Loan Bank Stock at carrying value 13,048 12,644    
Other Investment, Carrying Value 560 3    
Derivative Assets, carrying value 6 347    
Liabilities,Carrying Value Disclosure [Abstract]        
Derivative liabilities, carrying value 913 333    
Fair Value, Inputs, Level 3 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Loans Including HFS Fair Value 5,894,745 4,106,628    
Receivables, Fair Value Disclosure 36,781 34,254    
Servicing Assets 50,779 10,716    
Account Receivable and Other assets, Fair Value 78,595 37,842    
Liabilities, Fair Value Disclosure [Abstract]        
Deposits, Fair Value Disclosure 7,679,685 4,881,903    
Securities sold under agreements to repurchase 190,345 453,135    
Advances from FHLB 79,620 78,503    
Other Borrowings 1,195 1,214    
Subordinated capital notes 35,886 36,184    
Accrued expenses and other liabilities 185,660 87,665    
Assets,Carrying Value [Abstract]        
Loans held for investment, net of allowance for loan losses of $116,539 (December 31, 2018 - $164,231) 6,641,847 4,431,594    
Accrued interest receivable 36,781 34,254    
Servicing assets, carrying value 50,779 10,716    
Account receivable and oher assets, carrying value 78,595 37,842    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 7,698,610 4,908,115    
Securities Sold under Agreements to Repurchase 190,274 455,508    
Advances from FHLB 78,009 77,620    
Other Borrowings 1,195 1,214    
Subordinated capital notes 36,083 36,083    
Accrued expenses and other liabilities $ 185,660 $ 87,665