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INVESTMENT SECURITIES (Schedule of Securities with Unrealized Losses) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
item
Dec. 31, 2022
USD ($)
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 58,178 35,528
Less than 12 Months, Unrealized/Unrecognized Losses (2,638) (2,379)
12 months or more, Estimated Fair Value 371,672 387,125
12 months or more, Unrealized/Unrecognized Losses (97,608) (86,828)
Total, Estimated Fair Value 429,850 422,653
Total, Unrealized/Unrecognized Losses (100,246) (89,207)
Held-to-maturity Securities    
Held-to-maturity Securities    
Less than 12 Months, Estimated Fair Value 0 194,848
Less than 12 Months, Unrealized/Unrecognized Losses 0 (23,599)
12 months or more, Estimated Fair Value 396,258 242,442
12 months or more, Unrealized/Unrecognized Losses (82,628) (49,536)
Total, Estimated Fair Value 396,258 437,290
Total, Unrealized Losses (82,628) (73,135)
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 59,672 59,372
12 months or more, Unrealized/Unrecognized Losses (8,325) (8,624)
Total, Estimated Fair Value 59,672 59,372
Total, Unrealized/Unrecognized Losses (8,325) (8,624)
U.S. State and Municipal securities | Available-for-sale Securities.    
Available-for-sale Securities    
Less than 12 Months, Estimated Fair Value 0 2,546
Less than 12 Months, Unrealized/Unrecognized Losses 0 (527)
12 months or more, Estimated Fair Value 8,958 6,666
12 months or more, Unrealized/Unrecognized Losses (2,577) (1,910)
Total, Estimated Fair Value 8,958 9,212
Total, Unrealized/Unrecognized Losses (2,577) (2,437)
U.S. State and Municipal securities | Held-to-maturity Securities    
Held-to-maturity Securities    
Less than 12 Months, Estimated Fair Value 0 13,205
Less than 12 Months, Unrealized/Unrecognized Losses 0 (2,609)
12 months or more, Estimated Fair Value 12,680  
12 months or more, Unrealized/Unrecognized Losses (2,951)  
Total, Estimated Fair Value 12,680 13,205
Total, Unrealized Losses (2,951) (2,609)
Residential MBS | Available-for-sale Securities.    
Available-for-sale Securities    
Less than 12 Months, Estimated Fair Value 37,991 19,576
Less than 12 Months, Unrealized/Unrecognized Losses (1,520) (1,654)
12 months or more, Estimated Fair Value 286,871 305,936
12 months or more, Unrealized/Unrecognized Losses (83,806) (74,075)
Total, Estimated Fair Value 324,862 325,512
Total, Unrealized/Unrecognized Losses (85,326) (75,729)
Residential MBS | Held-to-maturity Securities    
Held-to-maturity Securities    
Less than 12 Months, Estimated Fair Value 0 162,960
Less than 12 Months, Unrealized/Unrecognized Losses 0 (19,625)
12 months or more, Estimated Fair Value 348,982 226,661
12 months or more, Unrealized/Unrecognized Losses (76,294) (47,402)
Total, Estimated Fair Value 348,982 389,621
Total, Unrealized Losses (76,294) (67,027)
Commercial MBS | Available-for-sale Securities.    
Available-for-sale Securities    
Less than 12 Months, Estimated Fair Value 20,187 13,406
Less than 12 Months, Unrealized/Unrecognized Losses (1,118) (198)
12 months or more, Estimated Fair Value 12,893 11,386
12 months or more, Unrealized/Unrecognized Losses (2,780) (2,031)
Total, Estimated Fair Value 33,080 24,792
Total, Unrealized/Unrecognized Losses (3,898) (2,229)
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 6,677 6,835
12 months or more, Unrealized/Unrecognized Losses (1,418) (1,276)
Total, Estimated Fair Value 6,677 6,835
Total, Unrealized Losses (1,418) (1,276)
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 3,278 3,765
12 months or more, Unrealized/Unrecognized Losses (120) (188)
Total, Estimated Fair Value 3,278 3,765
Total, Unrealized/Unrecognized Losses (120) (188)
US Treasury Securities | Held-to-maturity Securities    
Held-to-maturity Securities    
Less than 12 Months, Estimated Fair Value 0 18,683
Less than 12 Months, Unrealized/Unrecognized Losses 0 (1,365)
12 months or more, Estimated Fair Value 27,919 8,946
12 months or more, Unrealized/Unrecognized Losses (1,965) (858)
Total, Estimated Fair Value 27,919 27,629
Total, Unrealized Losses $ (1,965) $ (2,223)