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INCOME TAXES - Reconciliation of Effective Income Tax Rate to Statutory Federal Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal tax rate	34.00%	34.00%	35.00%
Increase (decrease) resulting from:
Tax exempt interest income	(13.00%)	(16.00%)	(11.30%)
Earnings from life insurance	(2.40%)	(4.70%)	(3.80%)
Disallowed interest expense	1.00%	1.00%	0.40%
Low-income housing credits and related expense	(4.60%)	(7.20%)	(5.00%)
Regulatory settlement	0.00%	4.30%	0.00%
Change in statutory federal tax rate	0.00%	2.30%	0.00%
Expense due to enactment of federal tax reform legislation	21.20%	0.00%	0.00%
Other	(1.30%)	2.30%	1.90%
Effective income tax rate	34.90%	16.00%	17.20%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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