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INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)
Dec. 31, 2022
May 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Amortized Cost        
Due in one year or less $ 0      
Due after one year through five years 0      
Due after five years through ten years 0      
Due after ten years 41,840,000      
Amortized Cost 664,883,000     $ 0
Fair Value        
Due in one year or less 0      
Due after one year through five years 0      
Due after five years through ten years 0      
Due after ten years 37,113,000      
Fair Value $ 596,780,000 $ 343,700,000 $ 329,500,000 0
Weighted Average Yield        
Due in one year or less (in percent) 0.00%      
Due after one year through five years (in percent) 0.00%      
Due after give years through ten years (in percent) 0.00%      
Due after ten years (in percent) 2.26%      
Weighted Average Yield 1.95%      
Amortized Cost        
Due in one year or less $ 5,774,000      
Due after one year through five years 15,816,000      
Due after five years through ten years 79,803,000      
Due after ten years 135,272,000      
Amortized Cost 801,370,000     1,646,508,000
Fair Value        
Due in one year or less 5,751,000      
Due after one year through five years 15,458,000      
Due after five years through ten years 70,558,000      
Due after ten years 99,911,000      
Fair Value $ 671,794,000     1,631,699,000
Weighted Average Yield        
Due in one year or less (in percent) 2.91%      
Due after one year through five years (in percent) 3.75%      
Due after five years through ten years (in percent) 2.60%      
Due after ten years (in percent) 2.43%      
Weighted Average Yield 2.24%      
Total Investment Securities, Amortized Cost $ 1,466,253,000      
Total Investment Securities, Fair Value $ 1,268,574,000      
Total Investment Securities, Weighted Average Yield 0.0210      
Residential - U.S. Government-sponsored entities ("GSEs")        
Amortized Cost        
Without single maturity date $ 623,043,000      
Amortized Cost 623,043,000      
Fair Value        
Without single maturity date 559,667,000      
Fair Value $ 559,667,000      
Weighted Average Yield        
Without single maturity date (in percent) 1.93%      
Amortized Cost        
Without single maturity date $ 498,989,000      
Amortized Cost 498,989,000     1,213,910,000
Fair Value        
Without single maturity date 423,803,000      
Fair Value $ 423,803,000     1,198,816,000
Weighted Average Yield        
Without single maturity date (in percent) 2.03%      
Residential - Non-Government Agencies        
Amortized Cost        
Without single maturity date $ 9,829,000      
Amortized Cost 9,829,000     11,942,000
Fair Value        
Without single maturity date 8,662,000      
Fair Value $ 8,662,000     12,213,000
Weighted Average Yield        
Without single maturity date (in percent) 3.33%      
Commercial - U.S. GSEs and agencies        
Amortized Cost        
Without single maturity date $ 54,346,000      
Amortized Cost 54,346,000     66,287,000
Fair Value        
Without single maturity date 46,144,000      
Fair Value $ 46,144,000     65,849,000
Weighted Average Yield        
Without single maturity date (in percent) 2.35%      
Commercial - Non-GSEs        
Amortized Cost        
Without single maturity date $ 1,541,000      
Amortized Cost 1,541,000     41,328,000
Fair Value        
Without single maturity date 1,507,000      
Fair Value $ 1,507,000     $ 42,013,000
Weighted Average Yield        
Without single maturity date (in percent) 4.10%