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INCOME TAXES - Reconciliation of Effective Income Tax Rate to Statutory Federal Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory federal tax rate	34.00%	35.00%	35.00%
Increase (decrease) resulting from:
State taxes, net of federal benefit	0.10%	0.10%	0.10%
Tax exempt interest income	(16.00%)	(11.30%)	(7.30%)
Valuation allowance on deferred tax assets	0.00%	0.00%	(145.80%)
Earnings from life insurance	(4.70%)	(3.80%)	(2.60%)
Disallowed interest expense	1.00%	0.40%	0.20%
Low-income housing credits and related expense	(7.20%)	(5.00%)	(3.70%)
Regulatory settlement	4.30%	0.00%	0.00%
Change in statutory federal tax rate	2.30%	0.00%	0.00%
Other	2.20%	1.80%	0.10%
Effective income tax rate	16.00%	17.20%	(124.00%)

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