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INCOME TAXES - Reconciliation of Effective Income Tax Rate to Statutory Federal Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal tax rate	21.00%	34.00%	34.00%	35.00%
Increase (decrease) resulting from:
Tax exempt interest income	(7.70%)	(13.00%)	(16.00%)
Earnings from life insurance	(1.70%)	(2.40%)	(4.70%)
Disallowed interest expense	0.80%	1.00%	1.00%
Low-income housing credits and related expense	(2.50%)	(4.60%)	(7.20%)
Merger related	0.60%	0.00%	0.00%
Expense due to enactment of federal tax reform legislation	0.00%	21.20%	0.00%
Regulatory settlement	0.00%	0.00%	4.30%
Change in statutory federal tax rate	0.00%	0.00%	2.30%
Other	0.90%	(1.30%)	2.30%
Effective income tax rate	11.40%	34.90%	16.00%

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- Definition

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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