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INCOME TAXES - Reconciliation of Effective Income Tax Rate to Statutory Federal Rate (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory federal tax rate	21.00%	21.00%	21.00%
Increase (decrease) resulting from:
State taxes, net of federal benefit	1.10%	1.00%	(0.10%)
Tax exempt interest income	(1.70%)	(2.00%)	(4.20%)
Income from life insurance	(0.90%)	(1.10%)	(1.70%)
Disallowed interest expense	0.00%	0.10%	0.30%
Low-income housing credits and related expense	(0.20%)	(0.80%)	(1.30%)
Merger related	0.00%	0.00%	0.70%
Other	0.30%	0.40%	(0.90%)
Effective income tax rate	19.60%	18.60%	13.80%

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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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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 other adjustments.

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