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Fair Value of Financial Instruments (Estimated Fair Value and Carrying Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale Securities $ 471,009 $ 446,438    
Held-to-maturity Fair Value 125,478      
Federal Home Loan Bank (FHLB) stock 8,233 8,278    
Other investments 5,557 3,962    
Servicing assets 47,911 47,295 $ 49,287 $ 50,779
Assets,Carrying Value [Abstract]        
Restricted cash 1,050 1,375 $ 1,050  
Trading Securities 23 22    
Held-to-maturity securities 126,767 0    
Loans, net of allowance for loan and lease losses 6,391,553 6,457,324    
Accrued interest receivable 61,028 65,547    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 8,756,762 8,415,640    
Subordinated capital notes 36,083 36,083    
Accrued expenses and other liabilities 127,190 154,418    
Fair Value, Inputs, Level 1 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Cash and cash equivalents 2,408,366 2,154,202    
Restricted cash 1,050 1,375    
Available-for-sale Securities 10,946 10,983    
Assets,Carrying Value [Abstract]        
Cash and Cash Equivalents, at Carrying Value 2,408,366 2,154,202    
Restricted cash 1,050 1,375    
Investment securities AFS , carrying value 10,946 10,983    
Fair Value, Inputs, Level 2 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Trading Securities 23 22    
Available-for-sale Securities 460,063 435,455    
Held-to-maturity Fair Value 125,478 0    
Federal Home Loan Bank (FHLB) stock 8,233 8,278    
Other investments 5,557 3,962    
Liabilities, Fair Value Disclosure [Abstract]        
Derivative Liabilities Current 1,465 1,712    
Assets,Carrying Value [Abstract]        
Trading Securities 23 22    
Investment securities AFS , carrying value 460,063 435,455    
Held-to-maturity securities 126,767 0    
Federal Home Loan Bank Stock at carrying value 8,233 8,278    
Other Investment, Carrying Value 5,557 3,962    
Liabilities,Carrying Value Disclosure [Abstract]        
Derivative liabilities, carrying value 1,465 1,712    
Fair Value, Inputs, Level 3 [Member]        
Assets, Fair Value Disclosure [Abstract]        
Total loans (including loans held-for-sale) 6,296,880 6,323,689    
Accrued interest receivable 61,028 65,547    
Servicing assets 47,911 47,295    
Accounts receivable and other assets 88,803 78,845    
Liabilities, Fair Value Disclosure [Abstract]        
Deposits 8,781,079 8,422,599    
Advances from FHLB 66,896 68,147    
Other borrowings 443 707    
Subordinated capital notes 33,381 33,325    
Accrued expenses and other liabilities 127,190 154,418    
Assets,Carrying Value [Abstract]        
Loans, net of allowance for loan and lease losses 6,432,079 6,501,259    
Accrued interest receivable 61,028 65,547    
Servicing assets, carrying value 47,911 47,295    
Account receivable and oher assets, carrying value 88,803 78,845    
Liabilities,Carrying Value Disclosure [Abstract]        
Deposits, Total 8,756,762 8,415,640    
Advances from FHLB 64,570 65,561    
Other Borrowings 443 707    
Subordinated capital notes 36,083 36,083    
Accrued expenses and other liabilities $ 127,190 $ 154,418