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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Changes in Other Comprehensive Income by Components) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period     $ 1,069,160  
Other comprehensive (loss) income before reclassifications $ (54,567) $ 568 (109,610) $ (3,768)
Amounts reclassified out of accumulated other comprehensive loss 180 452 561 1,366
Other comprehensive (loss) income (54,387) 1,020 (109,049) (2,402)
Balance at end of period 993,867 1,053,665 993,867 1,053,665
Net unrealized gain (loss) on securities available-for-sale        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (49,606) 8,408 5,663 12,092
Other comprehensive (loss) income before reclassifications (54,541) 920 (109,814) (2,767)
Amounts reclassified out of accumulated other comprehensive loss 2 2 6 5
Other comprehensive (loss) income (54,539) 922 (109,808) (2,762)
Balance at end of period (104,145) 9,330 (104,145) 9,330
Net unrealized gain (loss) on cash flow hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period 104 (808) (503) (1,070)
Other comprehensive (loss) income before reclassifications (26) (352) 204 (1,001)
Amounts reclassified out of accumulated other comprehensive loss 178 450 555 1,361
Other comprehensive (loss) income 152 98 759 360
Balance at end of period 256 (710) 256 (710)
Accumulated other comprehensive (loss) income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance at beginning of period (49,502) 7,600 5,160 11,022
Balance at end of period $ (103,889) $ 8,620 $ (103,889) $ 8,620