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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($) loan	Sep. 30, 2018 USD ($) loan	Sep. 30, 2019 USD ($) loan	Sep. 30, 2018 USD ($) loan	Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Related Parties, Description			At September 30, 2019 and December 31, 2018, outstanding loans to certain officers, directors and their associated companies was less than 5% of the Company's shareholders' equity.		At September 30, 2019 and December 31, 2018, outstanding loans to certain officers, directors and their associated companies was less than 5% of the Company's shareholders' equity.
Other industry exposures			0
Interest lost on nonaccrual loans	$ 106,000	$ 171,000	$ 330,000	$ 507,000
Loans modified | loan	0	1	0	1
Proceeds from the sale of mortgage loans			$ 168,394,000	$ 159,740,000
Gain on sale of mortgage loans			3,928,000	4,126,000
Loans held for sale, at fair value (book value of $16,630 and $4,314, respectively)	$ 16,449,000		16,449,000		$ 4,403,000
FHLB advances, general debt obligations, pledged collateral	1,300,000,000		1,300,000,000		1,100,000,000
Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans restructured due to credit difficulties that are now performing	3,300,000		3,300,000		3,900,000
Financing receivables impaired TDR non-performing	600,000		600,000		513,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	1,500,000		1,500,000		2,300,000
Fixed Rate Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from the sale of mortgage loans	86,900,000	$ 58,400,000	164,500,000	155,600,000
Gain on sale of mortgage loans	1,900,000	$ 1,500,000	3,900,000	$ 4,100,000
Loans held for sale, at fair value (book value of $16,630 and $4,314, respectively)	16,600,000		16,600,000		4,300,000
Home Equity Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified | loan		1		1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment		$ 299,000		$ 299,000
Nonoperating Income (Expense) | Fixed Rate Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gain on sale of mortgage loans	$ 205,000	$ 99,000	269,000	$ 67,000
Unrealized gain (loss) on loans held for sale			$ (181,000)		$ 89,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Months	18		18
Minimum | HPFC Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term to maturity	7 years
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Months	24		24
Maximum | HPFC Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term to maturity	10 years
Non-Residential Building Operators Industry Sector | Loan Concentration Risk | Total Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (percentage)			12.00%
Non-Residential Building Operators Industry Sector | Loan Concentration Risk | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (percentage)			31.00%

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