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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost $ 329,507  
Gross unrealized gains 0  
Gross Unrealized Losses (4)  
Held to maturity, fair value 329,503 $ 0
Held-to-maturity, allowance for credit loss 0  
Available for Sale    
Amortized cost 1,290,456 1,646,508
Gross unrealized gains 1,224 9,924
Gross unrealized losses (92,198) (24,733)
Fair value 1,199,482 1,631,699
Available-for-sale, allowance for credit loss 0 0
States and political subdivisions    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 41,730  
Gross unrealized gains 0  
Gross Unrealized Losses (1)  
Held to maturity, fair value 41,729  
Held-to-maturity, allowance for credit loss 0  
Available for Sale    
Amortized cost 178,137 235,521
Gross unrealized gains 487 3,156
Gross unrealized losses (14,443) (1,849)
Fair value 164,181 236,828
Available-for-sale, allowance for credit loss 0 0
Corporate securities    
Available for Sale    
Amortized cost 36,561 41,687
Gross unrealized gains 0 24
Gross unrealized losses (3,507) (1,065)
Fair value 33,054 40,646
Available-for-sale, allowance for credit loss 0 0
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Available for Sale    
Amortized cost 33,275 35,833
Gross unrealized gains 120 69
Gross unrealized losses (1,224) (568)
Fair value 32,171 35,334
Available-for-sale, allowance for credit loss 0 0
Residential - U.S. Government-sponsored entities    
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Amortized Cost 287,777  
Gross unrealized gains 0  
Gross Unrealized Losses (3)  
Held to maturity, fair value 287,774  
Held-to-maturity, allowance for credit loss 0  
Available for Sale    
Amortized cost 926,988 1,213,910
Gross unrealized gains 220 4,899
Gross unrealized losses (69,010) (19,993)
Fair value 858,198 1,198,816
Available-for-sale, allowance for credit loss 0 0
Residential - Non-government agencies    
Available for Sale    
Amortized cost 11,088 11,942
Gross unrealized gains 101 335
Gross unrealized losses (281) (64)
Fair value 10,908 12,213
Available-for-sale, allowance for credit loss 0 0
Commercial - U.S. Government-sponsored entities    
Available for Sale    
Amortized cost 63,074 66,287
Gross unrealized gains 17 756
Gross unrealized losses (3,733) (1,194)
Fair value 59,358 65,849
Available-for-sale, allowance for credit loss 0 0
Commercial - Non-government agencies    
Available for Sale    
Amortized cost 41,333 41,328
Gross unrealized gains 279 685
Gross unrealized losses 0 0
Fair value 41,612 42,013
Available-for-sale, allowance for credit loss $ 0 $ 0