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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net change in fair value of investment securities:      
Less: Reclassification adjustment for losses (gains) realized in net income $ 2,074    
Less: Amortization of unrealized losses on investment securities transferred to HTM (7,440) $ (4,295) $ 0
Other comprehensive income (loss) 29,518 (184,493) (38,319)
Defined benefit plans, Before Tax      
Net actuarial gains (losses) arising during the period (182) 2,007 2,014
Settlement   4,884  
Net change in fair value of investment securities:      
Less: Reclassification adjustment for losses (gains) realized in net income 547    
Other comprehensive income (loss) 8,130 (48,469) (10,231)
Defined benefit plans, Tax Effect      
Net actuarial gains (losses) arising during the period (48) 537 544
Settlement   1,817  
Net change in fair value of investment securities:      
Less: Reclassification adjustment for losses (gains) realized in net income (1,527)    
Net change in fair value of investment securities 15,852 (150,141) (30,317)
Total other comprehensive income (loss), net of tax 21,388 (136,024) (28,088)
Defined benefit plans, Net of Tax      
Net actuarial losses arising during the period (134) 1,470 1,470
Settlement   3,067  
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Noncontrolling Interest      
Net change in fair value of investment securities:      
Net unrealized gains (losses) on investment securities arising during the period 19,762 (204,250) (41,237)
Less: Reclassification adjustment for losses (gains) realized in net income     (150)
Less: Amortization of unrealized losses on investment securities transferred to HTM 7,440 6,218  
Net change in fair value of investment securities 29,276 (198,032) (41,387)
Net change in fair value of investment securities:      
Net unrealized gains (losses) on investment securities arising during the period 5,437 (54,109) (11,030)
Less: Reclassification adjustment for losses (gains) realized in net income     (40)
Less: Amortization of unrealized losses on investment securities transferred to HTM 2,105 1,520  
Net change in fair value of investment securities 8,089 (52,589) (11,070)
Net change in fair value of investment securities:      
Net unrealized gains (losses) on investment securities arising during the period 14,325 (150,141) (30,207)
Less: Reclassification adjustment for losses (gains) realized in net income     110
Less: Amortization of unrealized losses on investment securities transferred to HTM (5,335) (4,698)  
Net change in fair value of investment securities 21,187 (145,443) (30,317)
Gain (Loss) On Unrealized Losses On Derivative Instruments      
Net change in fair value of investment securities:      
Net unrealized gains arising during the period 491 6,326  
Other comprehensive income (loss) 491 6,326  
Net change in fair value of investment securities:      
Net unrealized gains arising during the period 107 1,681  
Other comprehensive income (loss) 107 1,681  
Net change in fair value of investment securities:      
Other comprehensive income (loss) before reclassifications 384 4,645  
Total other comprehensive income (loss), net of tax 384 4,645  
Amortization of net actuarial gains (losses)      
Defined benefit plans, Before Tax      
Amortization (74) (304) (1,036)
Defined benefit plans, Tax Effect      
Amortization (20) (81) (291)
Defined benefit plans, Net of Tax      
Amortization (54) (223) (745)
Amortization of net transition obligation      
Defined benefit plans, Before Tax      
Amortization 7 18 (18)
Defined benefit plans, Tax Effect      
Amortization 2 4 (4)
Defined benefit plans, Net of Tax      
Amortization 5 14 (14)
Defined Benefit Plans      
Net change in fair value of investment securities:      
Other comprehensive income (loss) (249) 7,213 3,068
Net change in fair value of investment securities:      
Other comprehensive income (loss) (66) 2,439 839
Net change in fair value of investment securities:      
Other comprehensive income (loss) before reclassifications (134) 1,470 1,470
Total other comprehensive income (loss), net of tax (183) 4,774 2,229
Defined benefit plans, Net of Tax      
Amortization $ 49 $ (3,304) $ (759)