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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
May 31, 2022
Mar. 31, 2022
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost $ 649,946 $ 664,883    
Gross Unrecognized Gains 0 0    
Gross Unrecognized Losses (68,724) (68,103)    
Fair Value 581,222 596,780 $ 343,700 $ 329,500
ACL 0 0    
Debt Securities, Available-for-Sale [Line Items]        
Amortized Cost 786,593 801,370    
Gross Unrealized Gains 13 6    
Gross Unrealized Losses (122,535) (129,582)    
Fair Value 664,071 671,794    
ACL 0 0    
States and political subdivisions        
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost 41,898 41,840    
Gross Unrecognized Gains 0 0    
Gross Unrecognized Losses (5,262) (4,727)    
Fair Value 36,636 37,113    
ACL 0 0    
Debt Securities, Available-for-Sale [Line Items]        
Amortized Cost 167,314 172,427    
Gross Unrealized Gains 4 6    
Gross Unrealized Losses (32,146) (36,681)    
Fair Value 135,172 135,752    
ACL 0 0    
Corporate securities        
Debt Securities, Available-for-Sale [Line Items]        
Amortized Cost 35,968 36,206    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (5,248) (5,995)    
Fair Value 30,720 30,211    
ACL 0 0    
U.S. Treasury obligations and direct obligations of U.S. Government agencies        
Debt Securities, Available-for-Sale [Line Items]        
Amortized Cost 24,933 28,032    
Gross Unrealized Gains 9 0    
Gross Unrealized Losses (2,295) (2,317)    
Fair Value 22,647 25,715    
ACL 0 0    
Residential - U.S. Government-sponsored entities        
Schedule of Held-to-Maturity Securities [Line Items]        
Amortized Cost 608,048 623,043    
Gross Unrecognized Gains 0 0    
Gross Unrecognized Losses (63,462) (63,376)    
Fair Value 544,586 559,667    
ACL 0 0    
Debt Securities, Available-for-Sale [Line Items]        
Amortized Cost 479,165 498,989    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (73,038) (75,186)    
Fair Value 406,127 423,803    
ACL 0 0    
Residential - Non-government agencies        
Debt Securities, Available-for-Sale [Line Items]        
Amortized Cost 9,512 9,829    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (1,157) (1,167)    
Fair Value 8,355 8,662    
ACL 0 0    
Commercial - U.S. Government-sponsored entities        
Debt Securities, Available-for-Sale [Line Items]        
Amortized Cost 53,142 54,346    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (8,157) (8,202)    
Fair Value 44,985 46,144    
ACL 0 0    
Commercial - Non-government agencies        
Debt Securities, Available-for-Sale [Line Items]        
Amortized Cost 16,559 1,541    
Gross Unrealized Gains 0 0    
Gross Unrealized Losses (494) (34)    
Fair Value 16,065 1,507    
ACL $ 0 $ 0