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INVESTMENT SECURITIES (Schedule of Securities with Unrealized Losses) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
item
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
item
Held-to-maturity Securities      
Number of securities of one issuer | item 0   0
Impairment loss $ 0 $ 0  
Available-for-sale Securities.      
Available-for-sale Securities      
Less than 12 Months, Estimated Fair Value 81,527   $ 10,873
Less than 12 Months, Unrealized/Unrecognized Losses (1,268)   (198)
12 months or more, Estimated Fair Value 369,312   380,995
12 months or more, Unrealized/Unrecognized Losses (81,656)   (78,854)
Total, Estimated Fair Value 450,839   391,868
Total, Unrealized/Unrecognized Losses (82,924)   (79,052)
Held-to-maturity Securities      
Held-to-maturity Securities      
Less than 12 Months, Estimated Fair Value 0   0
Less than 12 Months, Unrealized/Unrecognized Losses 0   0
12 months or more, Estimated Fair Value 393,180   404,252
12 months or more, Unrealized/Unrecognized Losses (67,069)   (64,608)
Total, Estimated Fair Value 393,180   404,252
Total, Unrealized Losses (67,069)   (64,608)
U.S. Government agency securities | Available-for-sale Securities.      
Available-for-sale Securities      
Less than 12 Months, Estimated Fair Value 0   0
Less than 12 Months, Unrealized/Unrecognized Losses 0   0
12 months or more, Estimated Fair Value 61,679   61,775
12 months or more, Unrealized/Unrecognized Losses (6,319)   (6,222)
Total, Estimated Fair Value 61,679   61,775
Total, Unrealized/Unrecognized Losses (6,319)   (6,222)
U.S. State and Municipal securities | Available-for-sale Securities.      
Available-for-sale Securities      
Less than 12 Months, Estimated Fair Value 0   0
Less than 12 Months, Unrealized/Unrecognized Losses 0   0
12 months or more, Estimated Fair Value 9,588   9,699
12 months or more, Unrealized/Unrecognized Losses (1,870)   (1,797)
Total, Estimated Fair Value 9,588   9,699
Total, Unrealized/Unrecognized Losses (1,870)   (1,797)
U.S. State and Municipal securities | Held-to-maturity Securities      
Held-to-maturity Securities      
Less than 12 Months, Estimated Fair Value 0   0
Less than 12 Months, Unrealized/Unrecognized Losses 0   0
12 months or more, Estimated Fair Value 13,761   13,995
12 months or more, Unrealized/Unrecognized Losses (1,746)   (1,574)
Total, Estimated Fair Value 13,761   13,995
Total, Unrealized Losses (1,746)   (1,574)
Residential MBS | Available-for-sale Securities.      
Available-for-sale Securities      
Less than 12 Months, Estimated Fair Value 51,236   0
Less than 12 Months, Unrealized/Unrecognized Losses (656)   0
12 months or more, Estimated Fair Value 281,826   292,970
12 months or more, Unrealized/Unrecognized Losses (71,156)   (68,609)
Total, Estimated Fair Value 333,062   292,970
Total, Unrealized/Unrecognized Losses (71,812)   (68,609)
Residential MBS | Held-to-maturity Securities      
Held-to-maturity Securities      
Less than 12 Months, Estimated Fair Value 0   0
Less than 12 Months, Unrealized/Unrecognized Losses 0   0
12 months or more, Estimated Fair Value 343,831   354,750
12 months or more, Unrealized/Unrecognized Losses (62,921)   (60,556)
Total, Estimated Fair Value 343,831   354,750
Total, Unrealized Losses (62,921)   (60,556)
Commercial MBS | Available-for-sale Securities.      
Available-for-sale Securities      
Less than 12 Months, Estimated Fair Value 30,291   10,873
Less than 12 Months, Unrealized/Unrecognized Losses (612)   (198)
12 months or more, Estimated Fair Value 13,102   13,322
12 months or more, Unrealized/Unrecognized Losses (2,261)   (2,168)
Total, Estimated Fair Value 43,393   24,195
Total, Unrealized/Unrecognized Losses (2,873)   (2,366)
Commercial MBS | Held-to-maturity Securities      
Held-to-maturity Securities      
Less than 12 Months, Estimated Fair Value 0   0
Less than 12 Months, Unrealized/Unrecognized Losses 0   0
12 months or more, Estimated Fair Value 7,012   7,024
12 months or more, Unrealized/Unrecognized Losses (1,072)   (1,066)
Total, Estimated Fair Value 7,012   7,024
Total, Unrealized Losses (1,072)   (1,066)
Asset-backed Securities | Available-for-sale Securities.      
Available-for-sale Securities      
Less than 12 Months, Estimated Fair Value 0   0
Less than 12 Months, Unrealized/Unrecognized Losses 0   0
12 months or more, Estimated Fair Value 3,117   3,229
12 months or more, Unrealized/Unrecognized Losses (50)   (58)
Total, Estimated Fair Value 3,117   3,229
Total, Unrealized/Unrecognized Losses (50)   (58)
US Treasury Securities | Held-to-maturity Securities      
Held-to-maturity Securities      
Less than 12 Months, Estimated Fair Value 0   0
Less than 12 Months, Unrealized/Unrecognized Losses 0   0
12 months or more, Estimated Fair Value 28,576   28,483
12 months or more, Unrealized/Unrecognized Losses (1,330)   (1,412)
Total, Estimated Fair Value 28,576   28,483
Total, Unrealized Losses $ (1,330)   $ (1,412)