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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax $ 804,580,000 $ 731,291,000 $ 754,140,000
Income tax (expense) benefit (17,237,000) (14,478,000) 3,725,000
Ending balance, net of tax 875,297,000 804,580,000 731,291,000
Retained  Earnings      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax 80,274,000 64,797,000 32,851,000
Ending balance, net of tax 111,208,000 80,274,000 64,797,000
Unrealized Gains (Losses) on Securities      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax 38,038,000 (31,120,000) (16,295,000)
Other comprehensive income (loss) before reclassifications 105,845,000 87,481,000 (21,956,000)
Reclassification adjustments included in net income (7,060,000) 60,000 3,083,000
Income tax (expense) benefit (20,745,000) (18,383,000) 3,963,000
Net current-period other comprehensive income (loss), net of tax 78,040,000 69,158,000 (14,910,000)
Ending balance, net of tax 116,078,000 38,038,000 (31,120,000)
Unrealized Gains (Losses) on Derivatives      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax (1,672,000) 7,146,000 6,399,000
Other comprehensive income (loss) before reclassifications (23,462,000) (9,118,000) 2,351,000
Reclassification adjustments included in net income 3,945,000 (2,043,000) (1,406,000)
Income tax (expense) benefit 4,098,000 2,343,000 (198,000)
Net current-period other comprehensive income (loss), net of tax (15,419,000) (8,818,000) 747,000
Ending balance, net of tax (17,091,000) (1,672,000) 7,146,000
Net Prior Service (Cost) Credit      
AOCI Attributable to Parent, Net of Tax      
Reclassification adjustments included in net income [1] (7,000) (8,000) (7,000)
Net Gain (Loss)      
AOCI Attributable to Parent, Net of Tax      
Reclassification adjustments included in net income [1] 3,035,000 2,386,000 2,189,000
Total      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax 4,236,000 (50,228,000) (36,298,000)
Other comprehensive income (loss) before reclassifications 82,168,000 68,547,000 (21,599,000)
Reclassification adjustments included in net income (87,000) 395,000 3,859,000
Income tax (expense) benefit (17,237,000) (14,478,000) 3,725,000
Net current-period other comprehensive income (loss), net of tax 64,844,000 54,464,000 (14,015,000)
Ending balance, net of tax 69,080,000 4,236,000 (50,228,000)
Pension Plans | Net Prior Service (Cost) Credit      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax (145,000) (139,000) (133,000)
Other comprehensive income (loss) before reclassifications 378,000 0 0
Reclassification adjustments included in net income (7,000) (8,000) (7,000)
Income tax (expense) benefit (77,000) 2,000 1,000
Net current-period other comprehensive income (loss), net of tax 294,000 (6,000) (6,000)
Ending balance, net of tax 149,000 (145,000) (139,000)
Pension Plans | Net Gain (Loss)      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax (31,985,000) (26,115,000) (26,269,000)
Other comprehensive income (loss) before reclassifications (593,000) (9,816,000) (1,994,000)
Reclassification adjustments included in net income 3,035,000 2,386,000 2,189,000
Income tax (expense) benefit (513,000) 1,560,000 (41,000)
Net current-period other comprehensive income (loss), net of tax 1,929,000 (5,870,000) 154,000
Ending balance, net of tax (30,056,000) (31,985,000) (26,115,000)
Cumulative effect of accounting change      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax (7,830,000) (16,452,000) 0
Ending balance, net of tax   (7,830,000) (16,452,000)
Cumulative effect of accounting change | Retained  Earnings      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax (7,830,000) (16,452,000) (85,000)
Ending balance, net of tax   (7,830,000) (16,452,000)
Cumulative effect of accounting change | Total      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax     85,000
Cumulative effect of accounting change | Accounting Standards Update 2016-01      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax [2]     85,000
Cumulative effect of accounting change | Accounting Standards Update 2016-01 | Retained  Earnings      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax     (107,000)
Cumulative effect of accounting change | Accounting Standards Update 2016-01 | Retained  Earnings | Net Of Tax, Adjustment      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax     (85,000)
Cumulative effect of accounting change | Accounting Standards Update 2016-01 | Unrealized Gains (Losses) on Securities      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax [2]     85,000
Cumulative effect of accounting change | Accounting Standards Update 2016-01 | Unrealized Gains (Losses) on Derivatives      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax [2]     0
Cumulative effect of accounting change | Pension Plans | Accounting Standards Update 2016-01 | Net Prior Service (Cost) Credit      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax [2]     0
Cumulative effect of accounting change | Pension Plans | Accounting Standards Update 2016-01 | Net Gain (Loss)      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax [2]     0
Adjusted beginning balance      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax 796,750,000 714,839,000 754,140,000
Ending balance, net of tax   796,750,000 714,839,000
Adjusted beginning balance | Retained  Earnings      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax 72,444,000 48,345,000 32,766,000
Ending balance, net of tax   72,444,000 48,345,000
Adjusted beginning balance | Unrealized Gains (Losses) on Securities      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax     (16,210,000)
Adjusted beginning balance | Unrealized Gains (Losses) on Derivatives      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax     6,399,000
Adjusted beginning balance | Total      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax $ 4,236,000 (50,228,000) (36,213,000)
Ending balance, net of tax   $ 4,236,000 (50,228,000)
Adjusted beginning balance | Pension Plans | Net Prior Service (Cost) Credit      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax     (133,000)
Adjusted beginning balance | Pension Plans | Net Gain (Loss)      
AOCI Attributable to Parent, Net of Tax      
Beginning balance, net of tax     $ (26,269,000)
[1] These AOCI components are included in the computation of net periodic pension cost (income) presented in “Note 10Employee Benefits.”
[2]     The Company adopted ASU 2016-01 on January 1, 2018. This amount includes a reclassification for the cumulative adjustment to retained earnings of $107,000 ($85,000, net of tax).