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INVESTMENT SECURITIES - Composition, Repricing and Yield Information of Investment Securities (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Securities available-for-sale, one year or less, fair value $ 631,305
Securities available-for-sale, one year or less, weighted average yield (percent) 1.57%
Securities available-for-sale, more than one year through five years, fair value $ 166,332
Securities available-for-sale, more than one year through five years, weighted average yield (percent) 4.57%
Securities available-for-sale, more than five years through ten years, fair value $ 103,123
Securities available-for-sale, more than five years through ten years, weighted average yield (percent) 2.42%
Securities available-for-sale, more than ten years, fair value $ 414,943
Securities available-for-sale, more than ten years, weighted average yield (percent) 2.19%
Securities available-for-sale, fair value $ 1,315,703
Weighted-Average Yield 2.19%
SBA loan pools securities  
Debt Securities, Available-for-sale [Line Items]  
Securities available-for-sale, one year or less, fair value $ 14,591
Securities available-for-sale, one year or less, weighted average yield (percent) 0.91%
Securities available-for-sale, more than one year through five years, fair value $ 0
Securities available-for-sale, more than one year through five years, weighted average yield (percent) 0.00%
Securities available-for-sale, more than five years through ten years, fair value $ 0
Securities available-for-sale, more than five years through ten years, weighted average yield (percent) 0.00%
Securities available-for-sale, more than ten years, fair value $ 0
Securities available-for-sale, more than ten years, weighted average yield (percent) 0.00%
Securities available-for-sale, fair value $ 14,591
Weighted-Average Yield 0.91%
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities  
Debt Securities, Available-for-sale [Line Items]  
Securities available-for-sale, one year or less, fair value $ 0
Securities available-for-sale, one year or less, weighted average yield (percent) 0.00%
Securities available-for-sale, more than one year through five years, fair value $ 0
Securities available-for-sale, more than one year through five years, weighted average yield (percent) 0.00%
Securities available-for-sale, more than five years through ten years, fair value $ 28,920
Securities available-for-sale, more than five years through ten years, weighted average yield (percent) 2.20%
Securities available-for-sale, more than ten years, fair value $ 163,049
Securities available-for-sale, more than ten years, weighted average yield (percent) 2.15%
Securities available-for-sale, fair value $ 191,969
Weighted-Average Yield 2.16%
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations  
Debt Securities, Available-for-sale [Line Items]  
Securities available-for-sale, one year or less, fair value $ 97,750
Securities available-for-sale, one year or less, weighted average yield (percent) 0.64%
Securities available-for-sale, more than one year through five years, fair value $ 10,692
Securities available-for-sale, more than one year through five years, weighted average yield (percent) 1.95%
Securities available-for-sale, more than five years through ten years, fair value $ 41,073
Securities available-for-sale, more than five years through ten years, weighted average yield (percent) 1.33%
Securities available-for-sale, more than ten years, fair value $ 92,026
Securities available-for-sale, more than ten years, weighted average yield (percent) 1.84%
Securities available-for-sale, fair value $ 241,541
Weighted-Average Yield 1.27%
Municipal securities  
Debt Securities, Available-for-sale [Line Items]  
Securities available-for-sale, one year or less, fair value $ 0
Securities available-for-sale, one year or less, weighted average yield (percent) 0.00%
Securities available-for-sale, more than one year through five years, fair value $ 0
Securities available-for-sale, more than one year through five years, weighted average yield (percent) 0.00%
Securities available-for-sale, more than five years through ten years, fair value $ 15,172
Securities available-for-sale, more than five years through ten years, weighted average yield (percent) 2.62%
Securities available-for-sale, more than ten years, fair value $ 103,843
Securities available-for-sale, more than ten years, weighted average yield (percent) 2.37%
Securities available-for-sale, fair value $ 119,015
Weighted-Average Yield 2.40%
Non-agency residential mortgage-backed securities  
Debt Securities, Available-for-sale [Line Items]  
Securities available-for-sale, one year or less, fair value $ 0
Securities available-for-sale, one year or less, weighted average yield (percent) 0.00%
Securities available-for-sale, more than one year through five years, fair value $ 0
Securities available-for-sale, more than one year through five years, weighted average yield (percent) 0.00%
Securities available-for-sale, more than five years through ten years, fair value $ 0
Securities available-for-sale, more than five years through ten years, weighted average yield (percent) 0.00%
Securities available-for-sale, more than ten years, fair value $ 56,025
Securities available-for-sale, more than ten years, weighted average yield (percent) 2.51%
Securities available-for-sale, fair value $ 56,025
Weighted-Average Yield 2.51%
Collateralized loan obligations  
Debt Securities, Available-for-sale [Line Items]  
Securities available-for-sale, one year or less, fair value $ 518,964
Securities available-for-sale, one year or less, weighted average yield (percent) 1.76%
Securities available-for-sale, more than one year through five years, fair value $ 0
Securities available-for-sale, more than one year through five years, weighted average yield (percent) 0.00%
Securities available-for-sale, more than five years through ten years, fair value $ 0
Securities available-for-sale, more than five years through ten years, weighted average yield (percent) 0.00%
Securities available-for-sale, more than ten years, fair value $ 0
Securities available-for-sale, more than ten years, weighted average yield (percent) 0.00%
Securities available-for-sale, fair value $ 518,964
Weighted-Average Yield 1.76%
Corporate debt securities  
Debt Securities, Available-for-sale [Line Items]  
Securities available-for-sale, one year or less, fair value $ 0
Securities available-for-sale, one year or less, weighted average yield (percent) 0.00%
Securities available-for-sale, more than one year through five years, fair value $ 155,640
Securities available-for-sale, more than one year through five years, weighted average yield (percent) 4.76%
Securities available-for-sale, more than five years through ten years, fair value $ 17,958
Securities available-for-sale, more than five years through ten years, weighted average yield (percent) 5.73%
Securities available-for-sale, more than ten years, fair value $ 0
Securities available-for-sale, more than ten years, weighted average yield (percent) 0.00%
Securities available-for-sale, fair value $ 173,598
Weighted-Average Yield 4.85%