INCOME TAXES - Deferred Tax Asets And Liabilities (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets:
Allowance for loan and lease losses	$ 14,287,000	$ 13,979,000
Lease liability	19,616,000	0
Fair value acquisition adjustments	1,322,000	2,253,000
Employee benefits	4,535,000	4,339,000
Pension plan OCI	2,845,000	3,228,000
Deferred loan fees and costs	471,000	306,000
Non-qualified stock option expense	659,000	457,000
Unrealized losses on investments available for sale	0	2,343,000
Losses on other real estate owned	201,000	202,000
Other than temporary impairment	76,000	76,000
Loan and deposit premium/discount	1,422,000	3,950,000
Deferred rent	0	1,270,000
Reserve for recourse loans	166,000	210,000
Loss carryforward	916,000	1,323,000
Tax credits carryforwards	0	251,000
Other	159,000	280,000
Gross deferred tax assets	46,675,000	34,467,000
Valuation allowance	(880,000)	(644,000)
Net deferred tax assets	45,795,000	33,823,000
Deferred Tax Liabilities:
Right of use asset	(17,688,000)	0
Unrealized gains on investments available for sale	(1,379,000)	0
Pension plan costs	(2,373,000)	(2,607,000)
Depreciation	(2,744,000)	(3,307,000)
Intangible assets	(3,338,000)	(3,701,000)
Bond accretion	(322,000)	(188,000)
Section 481 adjustments	(1,335,000)	(2,053,000)
Other	(585,000)	(404,000)
Gross deferred tax liabilities	(29,764,000)	(12,260,000)
Net deferred tax asset	$ 16,031,000	$ 21,563,000