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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Changes in each component of AOCI, net of tax      
Balance at beginning of period   $ 500,035 $ 504,675
Total other comprehensive income (loss), net of tax   (14,715) 1,760
Balance at end of period   484,108 511,561
Investment Securities      
Changes in each component of AOCI, net of tax      
Balance at beginning of period   5,073 4,729
Impact of the adoption of new accounting standards $ (594)    
Other comprehensive income/loss before reclassifications   (14,971) 2,124
Amounts reclassified from AOCI   0 0
Total other comprehensive income (loss), net of tax   (14,971) 2,124
Balance at end of period   (10,492) 6,853
Defined Benefit Plans      
Changes in each component of AOCI, net of tax      
Balance at beginning of period   (6,112) (6,250)
Impact of the adoption of new accounting standards (1,381)    
Other comprehensive income/loss before reclassifications   0 (627)
Amounts reclassified from AOCI   256 263
Total other comprehensive income (loss), net of tax   256 (364)
Balance at end of period   (7,237) (6,614)
Accumulated Other Comprehensive Income (Loss)      
Changes in each component of AOCI, net of tax      
Balance at beginning of period   (1,039) (1,521)
Other comprehensive income/loss before reclassifications   (14,971) 1,497
Amounts reclassified from AOCI   256 263
Total other comprehensive income (loss), net of tax   (14,715) 1,760
Balance at end of period   (17,729) $ 239
Accounting Standards Update 2018-02 and Accounting Standards Update 2016-01      
Changes in each component of AOCI, net of tax      
Impact of the adoption of new accounting standards   0  
Accounting Standards Update 2018-02 and Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss)      
Changes in each component of AOCI, net of tax      
Impact of the adoption of new accounting standards $ (1,975) $ (1,975)