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Fair Value of Financial Instruments (Estimated Fair Value and Carrying Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities $ 423,815   $ 1,074,169      
Federal Home Loan Bank (FHLB) stock 8,322   13,048      
Other investments 2,205   560      
Derivative assets 1   6      
Servicing assets 47,242 $ 47,926 50,779 $ 10,125 $ 10,134 $ 10,716
Assets,Carrying Value [Abstract]            
Restricted cash 1,050   1,450 $ 1,050    
Trading Securities 22   37      
Loans held for investment, net of allowance for credit losses of $235,313 (December 31, 2019 - $116,539) 6,524,614   6,622,256      
Accrued interest receivable 71,830   37,120      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 8,632,457   7,698,610      
Securities Sold under Agreements to Repurchase 0   190,274      
Subordinated capital notes 36,083   36,083      
Accrued expenses and other liabilities 162,133   185,660      
Fair Value, Inputs, Level 1 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Cash and cash equivalents 2,282,000   851,307      
Restricted cash 1,050   1,450      
Available-for-sale Securities 91,531   397,183      
Assets,Carrying Value [Abstract]            
Cash and Cash Equivalents, at Carrying Value 2,282,000   851,307      
Restricted cash 1,050   1,450      
Investment securities AFS , carrying value 91,531   397,183      
Fair Value, Inputs, Level 2 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Trading Securities 22   37      
Available-for-sale Securities 332,284   676,986      
Federal Home Loan Bank (FHLB) stock 8,322   13,048      
Other investments 2,205   560      
Derivative assets 1   6      
Liabilities, Fair Value Disclosure [Abstract]            
Derivative Liabilities Current 1,895   913      
Assets,Carrying Value [Abstract]            
Trading Securities 22   37      
Investment securities AFS , carrying value 332,284   676,986      
Federal Home Loan Bank Stock at carrying value 8,322   13,048      
Other Investment, Carrying Value 2,205   560      
Derivative Assets, carrying value 1   6      
Liabilities,Carrying Value Disclosure [Abstract]            
Derivative liabilities, carrying value 1,895   913      
Fair Value, Inputs, Level 3 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Total loans (including loans held-for-sale) 6,165,071   5,894,745      
Receivables, Fair Value Disclosure 71,830   36,781      
Servicing assets 47,242   50,779      
Accounts receivable and other assets 75,158   78,600      
Liabilities, Fair Value Disclosure [Abstract]            
Deposits 8,548,518   7,679,685      
Securities sold under agreements to repurchase 0   190,345      
Advances from FHLB 69,410   79,620      
Other borrowings 238   1,195      
Subordinated capital notes 34,031   35,886      
Accrued expenses and other liabilities 162,133   185,660      
Assets,Carrying Value [Abstract]            
Loans held for investment, net of allowance for credit losses of $235,313 (December 31, 2019 - $116,539) 6,579,140   6,641,847      
Accrued interest receivable 71,830   36,781      
Servicing assets, carrying value 47,242   50,779      
Account receivable and oher assets, carrying value 75,158   78,600      
Liabilities,Carrying Value Disclosure [Abstract]            
Deposits, Total 8,632,457   7,698,610      
Securities Sold under Agreements to Repurchase 0   190,274      
Advances from FHLB 66,543   78,009      
Other Borrowings 238   1,195      
Subordinated capital notes 36,083   36,083      
Accrued expenses and other liabilities $ 162,133   $ 185,660