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ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Amortization of unrealized losses                 $ 1,244 $ 1,255 $ 429
Tax benefit (expense) $ (2,521) $ (2,192) $ (3,360) $ (2,090) $ (5,870) $ (3,890) $ (3,353) $ (3,008) (10,163) (16,121) (10,325)
Total reclassifications for the period, net of tax                 (3,048) (1,943) (799)
Unrealized gains (losses)                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassified from accumulated other comprehensive income (loss)                 (3,190) [1] (630) 2,407
Realized net gain (loss) on interest rate swap derivatives                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassified from accumulated other comprehensive income (loss)                 1,406 (754) (1,815)
Net actuarial loss                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassified from accumulated other comprehensive income (loss) [2]                 (2,189) (1,613) (1,828)
Prior service credit                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassified from accumulated other comprehensive income (loss) [2]                 7 8 8
Amortization of pension plan                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassified from accumulated other comprehensive income (loss)                 (2,182) (1,605) (1,820)
Tax benefit                 459 562 637
Total reclassifications for the period, net of tax                 (1,723) (1,043) (1,183)
Unrealized losses on securities transferred | Reclassification out of accumulated other comprehensive income | Unrealized gains (losses)                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Amortization of unrealized losses [3]                 (1,244) (1,255) (429)
Tax benefit (expense)                 261 439 150
Net of tax                 (983) (816) (279)
Unrealized gains and losses on available for sale securities | Reclassification out of accumulated other comprehensive income | Unrealized gains (losses)                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Tax benefit (expense)                 386 (219) (993)
Net of tax                 (1,453) 406 1,843
Realized net (loss) gain on sale of securities [4]                 (1,839) 625 2,836
Interest Rate Swaps | Reclassification out of accumulated other comprehensive income | Realized net gain (loss) on interest rate swap derivatives                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Tax benefit (expense)                 (277) 290 635
Net of tax                 1,042 (538) (1,180)
Realized net gain (loss) on interest rate swaps [5]                 1,319 (828) (1,815)
Interest Rate Swaps | Reclassification out of accumulated other comprehensive income | Amortization of unrealized gains on terminated interest rate swaps                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Tax benefit (expense)                 (18) (26) 0
Net of tax                 69 48 0
Realized net gain (loss) on interest rate swaps [5]                 $ 87 $ 74 $ 0
[1] As discussed in “Note 1 – Summary of Significant Accounting and Reporting Policies,” 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).
[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (income) presented in “Note 11 - Employee Benefits.”
[3] Included in interest income on the consolidated statements of income.
[4] Listed as net (loss) gain on sale of securities available for sale on the consolidated statements of income.
[5] Included in interest expense for FHLB borrowings on the consolidated statements of income.