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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Jan. 01, 2018
Changes in each component of AOCI, net of tax                    
Balance at beginning of period     $ 491,725       $ 491,725      
Adjusted balance                 $ 488,625 $ 500,035
Total other comprehensive income (loss), net of tax $ 4,669 $ 12,413 11,238 $ (5,855) $ (3,519) $ (14,715) 28,320 $ (24,089)    
Balance at end of period 525,227           525,227      
Investment Securities                    
Changes in each component of AOCI, net of tax                    
Balance at beginning of period     (9,643) (14,161)   5,073 (9,643) 5,073    
Impact of the adoption of new accounting standards                 (3,100) (139)
Impact of the adoption of new accounting standards               (455)    
Adjusted balance   10,418             (12,743) 4,934
Other comprehensive income before reclassifications 4,412     (6,072)     27,573 (24,712)    
Reclassification adjustments from AOCI (26)     0     (26) 0    
Total other comprehensive income (loss), net of tax 4,386     (6,072)     27,547 (24,712)    
Balance at end of period 14,804     (20,233) (14,161)   14,804 (20,233)    
Defined Benefit Plans                    
Changes in each component of AOCI, net of tax                    
Balance at beginning of period     (6,450) (7,087)   (6,112) (6,450) (6,112)    
Impact of the adoption of new accounting standards                 0 0
Impact of the adoption of new accounting standards               (1,381)    
Adjusted balance   (5,960)             (6,450) (6,112)
Other comprehensive income before reclassifications 0     0     0 0    
Reclassification adjustments from AOCI 283     217     773 623    
Total other comprehensive income (loss), net of tax 283     217     773 623    
Balance at end of period (5,677)     (6,870) (7,087)   (5,677) (6,870)    
Accum. Other Comp. Income (Loss)                    
Changes in each component of AOCI, net of tax                    
Balance at beginning of period     (16,093) (21,248)   (1,039) (16,093) (1,039)    
Adjusted balance   4,458             (19,193) (1,178)
Other comprehensive income before reclassifications 4,412     (6,072)     27,573 (24,712)    
Reclassification adjustments from AOCI 257     217     747 623    
Total other comprehensive income (loss), net of tax 4,669 $ 12,413 $ 11,238 (5,855) (3,519) $ (14,715) 28,320 (24,089)    
Balance at end of period $ 9,127     $ (27,103) $ (21,248)   $ 9,127 (27,103)    
Accounting Standards Update 2018-02 and Accounting Standards Update 2016-01 [Member] | Accum. Other Comp. Income (Loss)                    
Changes in each component of AOCI, net of tax                    
Impact of the adoption of new accounting standards                 $ (3,100) (139)
Impact of the adoption of new accounting standards               $ (1,836)    
Accounting Standards Update 2018-02 [Member]                    
Changes in each component of AOCI, net of tax                    
Impact of the adoption of new accounting standards [1]                   0
Accounting Standards Update 2018-02 [Member] | Accum. Other Comp. Income (Loss)                    
Changes in each component of AOCI, net of tax                    
Impact of the adoption of new accounting standards [1]                   $ (1,836)
[1] (1) Represents the impact of the adoption of Accounting Standards Update ("ASU") ASU 2017-12. See Note 2 to the consolidated financial statements for additional information.