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INCOME TAXES - Reconciliation of Effective Applicable Income Tax Rate to Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory federal tax rate	35.00%	35.00%	35.00%
Increase/(decrease) resulting from:
State taxes, net of federal benefit	0.10%	0.10%	(1.80%)
Tax exempt interest income	(11.30%)	(7.30%)	(11.90%)
Valuation allowance on deferred tax assets	0.00%	(145.80%)	(13.00%)
Earnings from life insurance	(3.80%)	(2.60%)	(3.40%)
Disallowed interest	0.40%	0.20%	0.30%
Low-income housing credits	(5.00%)	(3.70%)	(2.20%)
Benefit of operating loss carryforward	0.00%	0.00%	(3.80%)
Other	1.80%	0.10%	(1.30%)
Effective income tax rate	17.20%	(124.00%)	(2.10%)

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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 life insurance expense.

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