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FAIR VALUE DISCLOSURES - Assets and Liabilities Measured At Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Assets:    
Total debt securities $ 1,522,535 $ 1,398,558
Debt Securities, Available-for-sale, Total   1,398,558
Mortgage banking derivative 19,485 14,309
Interest rate swap derivative 19,485 14,309
Liabilities:    
Mortgage banking derivative 19,499 14,329
Interest rate swap derivative 19,499 14,329
Fair Value, Measurements, Recurring    
Assets:    
U.S. Treasury securities 2,246 900
U.S. government sponsored agency securities 152,892 143,452
Mortgage-backed securities: residential 596,321 486,676
Mortgage-backed securities: commercial 96 523
State and municipal securities 770,980 767,007
Total debt securities 1,522,535  
Debt Securities, Available-for-sale, Total   1,398,558
Mortgage banking derivative 257 398
Interest rate swap derivative 19,485 14,309
Total assets 1,542,277 1,413,265
Liabilities:    
Mortgage banking derivative 3 2
Interest rate swap derivative 19,499 14,329
Total liabilities 19,502 14,331
Level 1 | Fair Value, Measurements, Recurring    
Assets:    
U.S. Treasury securities 2,246 900
U.S. government sponsored agency securities 0 0
Mortgage-backed securities: residential 0 0
Mortgage-backed securities: commercial 0 0
State and municipal securities 0 0
Total debt securities 2,246  
Debt Securities, Available-for-sale, Total   900
Mortgage banking derivative 0 0
Interest rate swap derivative 0 0
Total assets 2,246 900
Liabilities:    
Mortgage banking derivative 0 0
Interest rate swap derivative 0 0
Total liabilities 0 0
Level 2 | Fair Value, Measurements, Recurring    
Assets:    
U.S. Treasury securities 0 0
U.S. government sponsored agency securities 152,892 143,452
Mortgage-backed securities: residential 596,321 486,676
Mortgage-backed securities: commercial 96 523
State and municipal securities 768,663 764,964
Total debt securities 1,517,972  
Debt Securities, Available-for-sale, Total   1,395,615
Mortgage banking derivative 257 398
Interest rate swap derivative 19,485 14,309
Total assets 1,537,714 1,410,322
Liabilities:    
Mortgage banking derivative 3 2
Interest rate swap derivative 19,499 14,329
Total liabilities 19,502 14,331
Level 3 | Fair Value, Measurements, Recurring    
Assets:    
U.S. Treasury securities 0 0
U.S. government sponsored agency securities 0 0
Mortgage-backed securities: residential 0 0
Mortgage-backed securities: commercial 0 0
State and municipal securities 2,317 2,043
Total debt securities 2,317  
Debt Securities, Available-for-sale, Total   2,043
Mortgage banking derivative 0 0
Interest rate swap derivative 0 0
Total assets 2,317 2,043
Liabilities:    
Mortgage banking derivative 0 0
Interest rate swap derivative 0 0
Total liabilities $ 0 $ 0