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Fair Value of Financial Instruments (Estimated fair value and carrying value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities $ 657,460 $ 1,074,169    
Federal Home Loan Bank (FHLB) stock 10,301 13,048    
Other Investments 973 560    
Derivative Assets 2 6    
Servicing Assets 49,287 50,779 $ 10,623 $ 10,716
Assets,Carrying Value [Abstract]        
Restricted cash 1,050 1,450 $ 3,030  
Trading Securities 29 37    
Loans held for investment, net of allowance for credit losses of $230,755 (December 31, 2019 - $116,539) 6,535,359 6,622,256    
Accrued interest receivable 40,181 37,120    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 7,819,271 7,698,610    
Securities Sold under Agreements to Repurchase 50,103 190,274    
Subordinated capital notes 36,083 36,083    
Accrued expenses and other liabilities 181,395 185,660    
Fair Value, Inputs, Level 1 [Member]        
Assets, Fair Value Disclosure [Abstract]        
cash and cash equivalents 1,324,891 851,307    
Restricted cash 1,050 1,450    
Assets,Carrying Value [Abstract]        
Cash and Cash Equivalents, at Carrying Value 1,324,891 851,307    
Restricted cash 1,050 1,450    
Fair Value, Inputs, Level 2 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Trading Securities 29 37    
Available-for-sale Securities 657,460 1,074,169    
Federal Home Loan Bank (FHLB) stock 10,301 13,048    
Other Investments 973 560    
Derivative Assets 2 6    
Liabilities, Fair Value Disclosure [Abstract]        
Derivative Liabilities Current 2,059 913    
Assets,Carrying Value [Abstract]        
Trading Securities 29 37    
Investment securities AFS , carrying value 657,460 1,074,169    
Federal Home Loan Bank Stock at carrying value 10,301 13,048    
Other Investment, Carrying Value 973 560    
Derivative Assets, carrying value 2 6    
Liabilities,Carrying Value Disclosure [Abstract]        
Derivative liabilities, carrying value 2,059 913    
Fair Value, Inputs, Level 3 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Total loans (including loans held-for-sale) 6,166,068 5,894,745    
Receivables, Fair Value Disclosure 40,181 36,781    
Servicing Assets 49,287 50,779    
Account Receivable and Other assets, Fair Value 70,351 78,595    
Liabilities, Fair Value Disclosure [Abstract]        
Deposits, Fair Value Disclosure 7,802,049 7,679,685    
Securities sold under agreements to repurchase 49,907 190,345    
Advances from FHLB 80,070 79,620    
Other Borrowings 640 1,195    
Subordinated capital notes 38,693 35,886    
Accrued expenses and other liabilities 181,395 185,661    
Assets,Carrying Value [Abstract]        
Loans held for investment, net of allowance for credit losses of $230,755 (December 31, 2019 - $116,539) 6,541,174 6,641,847    
Accrued interest receivable 40,181 36,781    
Servicing assets, carrying value 49,287 50,779    
Account receivable and oher assets, carrying value 70,351 78,595    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 7,819,271 7,698,610    
Securities Sold under Agreements to Repurchase 50,103 190,274    
Advances from FHLB 76,961 78,009    
Other Borrowings 640 1,195    
Subordinated capital notes 36,083 36,083    
Accrued expenses and other liabilities $ 181,395 $ 185,661