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FAIR VALUE - Estimated Fair Values And The Related Carrying Values Of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial Assets:      
Cash and cash equivalents $ 501,945   $ 249,927
Securities available for sale 840,429 $ 734,845 734,845
Real estate mortgages held for sale 19,755   11,651
Loans, net 4,355,296   4,532,639
Mortgage banking derivative 1,217   1,182
Interest rate swap derivative 18,194   21,764
Accrued interest receivable 19,355   18,761
Financial Liabilities:      
Certificates of deposit (1,014,233)   (1,033,095)
All other deposits (4,223,091)   (4,011,986)
Miscellaneous borrowings   (10,500)  
Federal Home Loan Bank advances (65,349) (68,967)  
Mortgage banking derivative (4)   (111)
Interest rate swap derivative (18,206)   (21,794)
Standby letters of credit (484)   (686)
Accrued interest payable (4,283)   (5,959)
Carrying Value [Member]      
Financial Assets:      
Cash and cash equivalents 501,945   249,927
Securities available for sale 840,429   734,845
Real estate mortgages held for sale 19,092   11,218
Loans, net 4,402,787   4,587,748
Mortgage banking derivative 1,217   1,182
Interest rate swap derivative 18,194   21,764
Federal Reserve and Federal Home Loan Bank stock 13,772   13,772
Accrued interest receivable 19,355   18,761
Financial Liabilities:      
Certificates of deposit (1,006,879)   (1,024,819)
All other deposits (4,223,091)   (4,011,986)
Miscellaneous borrowings   (10,500)  
Federal Home Loan Bank advances (75,000) (75,000)  
Mortgage banking derivative (4)   (111)
Interest rate swap derivative (18,206)   (21,794)
Standby letters of credit (484)   (686)
Accrued interest payable (4,283)   (5,959)
Level 1 | Estimate of Fair Value Measurement      
Financial Assets:      
Cash and cash equivalents 499,989   247,228
Securities available for sale 900   0
Real estate mortgages held for sale 0   0
Loans, net 0   0
Mortgage banking derivative 0   0
Interest rate swap derivative 0   0
Accrued interest receivable 0   0
Financial Liabilities:      
Certificates of deposit 0   0
All other deposits (4,223,091)   (4,011,986)
Miscellaneous borrowings     0
Federal Home Loan Bank advances 0   0
Mortgage banking derivative 0   0
Interest rate swap derivative 0   0
Standby letters of credit 0   0
Accrued interest payable (71)   (66)
Level 2 | Estimate of Fair Value Measurement      
Financial Assets:      
Cash and cash equivalents 1,956   2,699
Securities available for sale 839,389   734,705
Real estate mortgages held for sale 19,755   11,651
Loans, net 0   0
Mortgage banking derivative 1,217   1,182
Interest rate swap derivative 18,194   21,764
Accrued interest receivable 4,420   3,801
Financial Liabilities:      
Certificates of deposit (1,014,233)   (1,033,095)
All other deposits 0   0
Miscellaneous borrowings   (10,500)  
Federal Home Loan Bank advances (65,349) $ (68,967)  
Mortgage banking derivative (4)   (111)
Interest rate swap derivative (18,206)   (21,794)
Standby letters of credit 0   0
Accrued interest payable (4,212)   (5,893)
Level 3 | Estimate of Fair Value Measurement      
Financial Assets:      
Cash and cash equivalents 0   0
Securities available for sale 140   140
Real estate mortgages held for sale 0   0
Loans, net 4,355,296   4,532,639
Mortgage banking derivative 0   0
Interest rate swap derivative 0   0
Accrued interest receivable 14,935   14,960
Financial Liabilities:      
Certificates of deposit 0   0
All other deposits 0   0
Miscellaneous borrowings     0
Federal Home Loan Bank advances 0   0
Mortgage banking derivative 0   0
Interest rate swap derivative 0   0
Standby letters of credit (484)   (686)
Accrued interest payable $ 0   $ 0