FAIR VALUE MEASUREMENT AND DISCLOSURE (Schedule of Carrying Amounts and Estimated Fair Value for Financial Instrument Assets and Liabilities) (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Financial assets:
Available-for-sale Securities		$ 1,047,663	$ 918,118
Held-to-maturity securities, at amortized cost		1,299	1,302
Debt Securities, Held-to-maturity, Fair Value		1,388	1,359
Loans held for sale		35,909	11,915
Mortgage servicing rights		1,849	1,496
Financial liabilities:
Time deposits		485,240	594,881
Short-term Debt, Fair Value		245,976	268,631
Long-term Debt, Fair Value		25,362	10,002
Subordinated debentures		45,588	50,171
Residential Real Estate
Financial assets:
Loans receivable, net of allowance	[1]	1,058,558	1,066,544
Commercial Real Estate
Financial assets:
Loans receivable, net of allowance	[1]	1,247,001	1,196,297
Commercial
Financial assets:
Loans receivable, net of allowance	[1],[2]	416,406	431,892
Home Equity
Financial assets:
Loans receivable, net of allowance	[1]	280,674	293,565
Consumer
Financial assets:
Loans receivable, net of allowance	[1]	20,552	23,355
Readily Available Market Prices (Level 1)
Financial assets:
Debt Securities, Held-to-maturity, Fair Value		0	0
Mortgage servicing rights		0	0
Financial liabilities:
Time deposits		0	0
Short-term Debt, Fair Value		0	0
Long-term Debt, Fair Value		0	0
Subordinated debentures		0	0
Readily Available Market Prices (Level 1) | Residential Real Estate
Financial assets:
Loans receivable, net of allowance		0	0
Readily Available Market Prices (Level 1) | Commercial Real Estate
Financial assets:
Loans receivable, net of allowance		0	0
Readily Available Market Prices (Level 1) | Commercial
Financial assets:
Loans receivable, net of allowance		0	0
Readily Available Market Prices (Level 1) | Home Equity
Financial assets:
Loans receivable, net of allowance		0	0
Readily Available Market Prices (Level 1) | Consumer
Financial assets:
Loans receivable, net of allowance		0	0
Observable Market Data (Level 2)
Financial assets:
Debt Securities, Held-to-maturity, Fair Value		1,388	1,359
Mortgage servicing rights		0	0
Financial liabilities:
Time deposits		485,240	594,881
Short-term Debt, Fair Value		245,976	268,631
Long-term Debt, Fair Value		25,362	10,002
Subordinated debentures		45,588	50,171
Observable Market Data (Level 2) | Residential Real Estate
Financial assets:
Loans receivable, net of allowance		0	0
Observable Market Data (Level 2) | Commercial Real Estate
Financial assets:
Loans receivable, net of allowance		0	0
Observable Market Data (Level 2) | Commercial
Financial assets:
Loans receivable, net of allowance		0	0
Observable Market Data (Level 2) | Home Equity
Financial assets:
Loans receivable, net of allowance		0	0
Observable Market Data (Level 2) | Consumer
Financial assets:
Loans receivable, net of allowance		0	0
Company Determined Fair Value (Level 3)
Financial assets:
Debt Securities, Held-to-maturity, Fair Value		0	0
Mortgage servicing rights		1,849	1,496
Financial liabilities:
Time deposits		0	0
Short-term Debt, Fair Value		0	0
Long-term Debt, Fair Value		0	0
Subordinated debentures		0	0
Company Determined Fair Value (Level 3) | Residential Real Estate
Financial assets:
Loans receivable, net of allowance	[1]	1,058,558	1,066,544
Company Determined Fair Value (Level 3) | Commercial Real Estate
Financial assets:
Loans receivable, net of allowance	[1]	1,247,001	1,196,297
Company Determined Fair Value (Level 3) | Commercial
Financial assets:
Loans receivable, net of allowance	[1],[2]	416,406	431,892
Company Determined Fair Value (Level 3) | Home Equity
Financial assets:
Loans receivable, net of allowance	[1]	280,674	293,565
Company Determined Fair Value (Level 3) | Consumer
Financial assets:
Loans receivable, net of allowance	[1]	20,552	23,355
Carrying Amount
Financial assets:
Held-to-maturity securities, at amortized cost		1,299	1,302
Mortgage servicing rights		1,486	877
Financial liabilities:
Time deposits		481,396	595,549
Short-term Debt, Fair Value		245,998	268,809
Long-term Debt, Fair Value		25,000	10,000
Subordinated debentures		59,231	59,080
Carrying Amount | Residential Real Estate
Financial assets:
Loans receivable, net of allowance	[1]	1,045,730	1,064,532
Carrying Amount | Commercial Real Estate
Financial assets:
Loans receivable, net of allowance	[1]	1,292,599	1,230,983
Carrying Amount | Commercial
Financial assets:
Loans receivable, net of allowance	[1],[2]	423,337	438,716
Carrying Amount | Home Equity
Financial assets:
Loans receivable, net of allowance	[1]	287,731	310,356
Carrying Amount | Consumer
Financial assets:
Loans receivable, net of allowance	[1]	$ 22,415	$ 25,265

[1] (1) The presented carrying amount is net of the allocated ALL.

[2] (2) Includes the HPFC loan portfolio.