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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
Dec. 31, 2022
May 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Held-to-Maturity:        
Amortized Cost $ 664,883,000     $ 0
Gross Unrecognized Gains 0      
Gross Unrecognized Losses (68,103,000)      
Fair Value 596,780,000 $ 343,700,000 $ 329,500,000 0
ACL 0      
Available-for-Sale:        
Amortized Cost 801,370,000     1,646,508,000
Gross Unrecognized Gains 6,000     9,924,000
Gross Unrecognized Losses (129,582,000)     (24,733,000)
Fair Value 671,794,000     1,631,699,000
ACL 0     0
States and political subdivisions        
Held-to-Maturity:        
Amortized Cost 41,840,000      
Gross Unrecognized Gains 0      
Gross Unrecognized Losses (4,727,000)      
Fair Value 37,113,000      
ACL 0      
Available-for-Sale:        
Amortized Cost 172,427,000     235,521,000
Gross Unrecognized Gains 6,000     3,156,000
Gross Unrecognized Losses (36,681,000)     (1,849,000)
Fair Value 135,752,000     236,828,000
ACL 0     0
Residential - U.S. Government-sponsored entities ("GSEs")        
Held-to-Maturity:        
Amortized Cost 623,043,000      
Gross Unrecognized Gains 0      
Gross Unrecognized Losses (63,376,000)      
Fair Value 559,667,000      
ACL 0      
Available-for-Sale:        
Amortized Cost 498,989,000     1,213,910,000
Gross Unrecognized Gains 0     4,899,000
Gross Unrecognized Losses (75,186,000)     (19,993,000)
Fair Value 423,803,000     1,198,816,000
ACL 0     0
Corporate securities        
Available-for-Sale:        
Amortized Cost 36,206,000     41,687,000
Gross Unrecognized Gains 0     24,000
Gross Unrecognized Losses (5,995,000)     (1,065,000)
Fair Value 30,211,000     40,646,000
ACL 0     0
U.S. Treasury obligations and direct obligations of U.S Government agencies        
Available-for-Sale:        
Amortized Cost 28,032,000     35,833,000
Gross Unrecognized Gains 0     69,000
Gross Unrecognized Losses (2,317,000)     (568,000)
Fair Value 25,715,000     35,334,000
ACL 0     0
Residential - Non-Government Agencies        
Available-for-Sale:        
Amortized Cost 9,829,000     11,942,000
Gross Unrecognized Gains 0     335,000
Gross Unrecognized Losses (1,167,000)     (64,000)
Fair Value 8,662,000     12,213,000
ACL 0     0
Commercial - U.S. GSEs and agencies        
Available-for-Sale:        
Amortized Cost 54,346,000     66,287,000
Gross Unrecognized Gains 0     756,000
Gross Unrecognized Losses (8,202,000)     (1,194,000)
Fair Value 46,144,000     65,849,000
ACL 0     0
Commercial - Non-GSEs        
Available-for-Sale:        
Amortized Cost 1,541,000     41,328,000
Gross Unrecognized Gains 0     685,000
Gross Unrecognized Losses (34,000)     0
Fair Value 1,507,000     42,013,000
ACL $ 0     $ 0