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Fair Value of Financial Instruments (Estimated Fair Value and Carrying Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities $ 446,438 $ 1,074,169    
Federal Home Loan Bank (FHLB) stock 8,278 13,048    
Other investments 3,962 560    
Derivative assets 0 6    
Servicing assets 47,295 50,779 $ 10,716 $ 9,821
Assets, Carrying Value [Abstract]        
Restricted cash 1,375 1,450 $ 3,030  
Trading Securities 22 37    
Loans held for investment, net of allowance for credit losses of $204,809 (December 31, 2019 - $116,539) 6,457,324 6,622,256    
Carrying amount, net   1,971,842    
Accrued interest receivable 65,547 37,120    
Liabilities, Carrying Value Disclosure [Abstract]        
Deposits, Total 8,415,640 7,698,610    
Securities Sold under Agreements to Repurchase 0 190,274    
Subordinated capital notes 36,083 36,083    
Accrued expenses and other liabilities 154,418 185,660    
Fair Value, Inputs, Level 1 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Cash and cash equivalents 2,154,202 851,307    
Restricted cash 1,375 1,450    
Available-for-sale Securities 10,983 397,183    
Assets, Carrying Value [Abstract]        
Cash and Cash Equivalents, at Carrying Value 2,154,202 851,307    
Restricted cash 1,375 1,450    
Investment securities AFS , carrying value 10,983 397,183    
Fair Value, Inputs, Level 2 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Trading Securities 22 37    
Available-for-sale Securities 435,455 676,986    
Federal Home Loan Bank (FHLB) stock 8,278 13,048    
Other investments 3,962 560    
Derivative assets 0 6    
Liabilities, Fair Value Disclosure [Abstract]        
Derivative Liabilities Current 1,712 913    
Assets, Carrying Value [Abstract]        
Trading Securities 22 37    
Investment securities AFS , carrying value 435,455 676,986    
Federal Home Loan Bank Stock at carrying value 8,278 13,048    
Other Investment, Carrying Value 3,962 560    
Derivative Assets, carrying value 0 6    
Liabilities, Carrying Value Disclosure [Abstract]        
Derivative liabilities, carrying value 1,712 913    
Fair Value, Inputs, Level 3 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Total loans (including loans held-for-sale) 6,323,689 5,894,745    
Receivables, Fair Value Disclosure 65,547 36,781    
Servicing assets 47,295 50,779    
Accounts receivable and other assets 78,845 78,595    
Liabilities, Fair Value Disclosure [Abstract]        
Deposits 8,422,599 7,679,685    
Securities sold under agreements to repurchase 0 190,345    
Advances from FHLB 68,147 79,620    
Other borrowings 707 1,195    
Subordinated capital notes 33,325 35,886    
Accrued expenses and other liabilities 154,418 185,660    
Assets, Carrying Value [Abstract]        
Loans held for investment, net of allowance for credit losses of $204,809 (December 31, 2019 - $116,539) 6,501,259 6,641,847    
Accrued interest receivable 65,547 36,781    
Servicing assets, carrying value 47,295 50,779    
Account receivable and other assets, carrying value 78,845 78,595    
Liabilities, Carrying Value Disclosure [Abstract]        
Deposits, Total 8,415,640 7,698,610    
Securities Sold under Agreements to Repurchase 0 190,274    
Advances from FHLB 65,561 78,009    
Other Borrowings 707 1,195    
Subordinated capital notes 36,083 36,083    
Accrued expenses and other liabilities $ 154,418 $ 185,660