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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,577,005	$ 1,497,657	$ 1,552,918	$ 1,496,264
Other comprehensive (loss) before reclassifications	14,206	(5,838)	24,774	(20,069)
Less: amounts reclassified from accumulated other comprehensive income (loss)	(1)	1	3	1
Total other comprehensive income/(loss)	14,207	(5,839)	24,771	(20,070)
Balance at end of period	1,779,837	1,516,241	1,779,837	1,516,241
Net unrealized holding gain (loss) on AFS securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(889)	(13,182)	(11,453)	6,008
Other comprehensive (loss) before reclassifications	14,206	(5,838)	24,774	(20,069)
Less: amounts reclassified from accumulated other comprehensive income (loss)	(1)	1	3	1
Total other comprehensive income/(loss)	14,207	(5,839)	24,771	(20,070)
Balance at end of period	13,318	(19,021)	13,318	(19,021)
Net unrealized holding (loss) on pension plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(2,017)	(2,245)	(2,017)	(1,847)
Other comprehensive (loss) before reclassifications	0	0	0	0
Less: amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Total other comprehensive income/(loss)	0	0	0	0
Balance at end of period	(2,017)	(2,245)	(2,017)	(2,245)
Accumulated other comprehensive income/(loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(2,906)	(15,427)	(13,470)	4,161
Total other comprehensive income/(loss)	14,207	(5,839)	24,771	(20,070)
Balance at end of period	$ 11,301	$ (21,266)	$ 11,301	(21,266)
Accounting Standards Updates 2016-01 and 2018-02
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02				5,357
Accounting Standards Updates 2016-01 and 2018-02 | Net unrealized holding gain (loss) on AFS securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02				4,959
Accounting Standards Updates 2016-01 and 2018-02 | Net unrealized holding (loss) on pension plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02				$ 398

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Reclassification From AOCI, Accounting Standards Update, Current Period, Net Of Tax, Attributable To Parent

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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