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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Jan. 01, 2018
Changes in each component of AOCI, net of tax        
Balance at beginning of period $ 491,725      
Adjusted balance     $ 488,625 $ 500,035
Total other comprehensive income (loss), net of tax 11,238 $ (14,715)    
Balance at end of period 502,638      
Investment Securities        
Changes in each component of AOCI, net of tax        
Balance at beginning of period (9,643) 5,073    
Adjusted balance     (12,743) 4,934
Other comprehensive income (loss) before reclassifications 10,996 (14,971)    
Reclassification adjustments from AOCI 0 0    
Total other comprehensive income (loss), net of tax 10,996 (14,971)    
Balance at end of period (1,747) (10,492)    
Defined Benefit Plans        
Changes in each component of AOCI, net of tax        
Balance at beginning of period (6,450) (6,112)    
Adjusted balance     (6,450) (6,112)
Other comprehensive income (loss) before reclassifications 0 0    
Reclassification adjustments from AOCI 242 256    
Total other comprehensive income (loss), net of tax 242 256    
Balance at end of period (6,208) (7,237)    
Accumulated Other Comprehensive Income (Loss)        
Changes in each component of AOCI, net of tax        
Balance at beginning of period (16,093) (1,039)    
Adjusted balance     (19,193) (1,178)
Other comprehensive income (loss) before reclassifications 10,996 (14,971)    
Reclassification adjustments from AOCI 242 256    
Total other comprehensive income (loss), net of tax 11,238 (14,715)    
Balance at end of period $ (7,955) $ (17,729)    
Accounting Standards Update 2017-12 [Member] | Investment Securities        
Changes in each component of AOCI, net of tax        
Impact of the adoption of new accounting standards     (3,100)  
Accounting Standards Update 2017-12 [Member] | Defined Benefit Plans        
Changes in each component of AOCI, net of tax        
Impact of the adoption of new accounting standards     0  
Accounting Standards Update 2017-12 [Member] | Accumulated Other Comprehensive Income (Loss)        
Changes in each component of AOCI, net of tax        
Impact of the adoption of new accounting standards [1]     $ (3,100)  
Accounting Standards Update 2016-01 [Member]        
Changes in each component of AOCI, net of tax        
Impact of the adoption of new accounting standards [2]       0
Accounting Standards Update 2016-01 [Member] | Investment Securities        
Changes in each component of AOCI, net of tax        
Impact of the adoption of new accounting standards       (139)
Accounting Standards Update 2016-01 [Member] | Defined Benefit Plans        
Changes in each component of AOCI, net of tax        
Impact of the adoption of new accounting standards       0
Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Income (Loss)        
Changes in each component of AOCI, net of tax        
Impact of the adoption of new accounting standards [2]       (139)
Accounting Standards Update 2018-02 [Member]        
Changes in each component of AOCI, net of tax        
Impact of the adoption of new accounting standards [3]       0
Accounting Standards Update 2018-02 [Member] | Investment Securities        
Changes in each component of AOCI, net of tax        
Impact of the adoption of new accounting standards       (455)
Accounting Standards Update 2018-02 [Member] | Defined Benefit Plans        
Changes in each component of AOCI, net of tax        
Impact of the adoption of new accounting standards       (1,381)
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss)        
Changes in each component of AOCI, net of tax        
Impact of the adoption of new accounting standards [3]       $ (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.
[2] (2) Represents the impact of the adoption of ASU 2016-01.
[3] (3) Represents the impact of the adoption of ASU 2018-02.