LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details)	3 Months Ended				9 Months Ended
	Sep. 30, 2016 USD ($) loan property	Sep. 30, 2015 USD ($) loan	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) loan property	Sep. 30, 2015 USD ($) loan	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($) property	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses	$ 1,000,000				$ 4,000,000
Increase in loans						$ 761,900,000
Number of loans	2				2
Loan charge offs	$ 1,400,000
Other industry exposures	0
Interest lost on nonaccrual loans	$ 251,000			$ 103,000	$ 675,000	$ 375,000
Number of TDRs	6	1	0		6	1
Commitments to lend	$ 0				$ 0			$ 0
Loans modified | loan	0	0			0	0
Financing Receivable, Individually Evaluated for Impairment	$ 20,682,000	$ 10,550,000	$ 10,550,000	10,550,000	$ 20,682,000	$ 10,550,000		15,235,000
Proceeds from the sale of mortgage loans					170,765,000	24,985,000
Gain on sale of mortgage loans					4,171,000	530,000
Loans held for sale	24,644,000				24,644,000			10,958,000
Other real estate owned	811,000				811,000			1,304,000
Financing Receivable, Allowance for Credit Losses	23,290,000	21,132,000	21,132,000	21,132,000	23,290,000	21,132,000	$ 23,717,000	21,166,000	$ 21,194,000	$ 21,116,000
FHLB advances, general debt obligations, pledged collateral	1,100,000,000				1,100,000,000			1,100,000,000
Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans restructured due to credit difficulties that are now performing	4,400,000				4,400,000			4,800,000
Financing receivables impaired TDR non-performing	1,600,000				1,600,000			446,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	4,551,000	5,200,000	5,200,000	5,200,000	4,551,000	5,200,000		6,026,000
Mortgage Loans in Process of Foreclosure, Amount	1,500,000				1,500,000			2,900,000
Financing Receivable, Allowance for Credit Losses	$ 4,595,000	4,532,000	4,532,000	4,532,000	$ 4,595,000	4,532,000	4,431,000	4,545,000	4,689,000	4,899,000
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	1				1
Recorded investment	$ 11,300,000				$ 11,300,000
Financing Receivable, Individually Evaluated for Impairment	13,286,000	3,737,000	3,737,000	3,737,000	13,286,000	3,737,000		4,610,000
Financing Receivable, Allowance for Credit Losses	12,580,000	8,977,000	8,977,000	8,977,000	$ 12,580,000	8,977,000	11,559,000	10,432,000	8,160,000	7,951,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses	$ 2,300,000
Number of loans | loan	1				1
Recorded investment	$ 1,600,000				$ 1,600,000
Financing Receivable, Individually Evaluated for Impairment	2,243,000	950,000	950,000	950,000	2,243,000	950,000		3,937,000
Financing Receivable, Allowance for Credit Losses	3,283,000	3,148,000	3,148,000	3,148,000	3,283,000	3,148,000	4,558,000	3,241,000	3,315,000	3,354,000
Home Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	489,000	506,000	506,000	506,000	489,000	506,000		588,000
Financing Receivable, Allowance for Credit Losses	2,567,000	2,072,000	2,072,000	2,072,000	2,567,000	2,072,000	2,946,000	2,731,000	2,144,000	2,247,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	7,000	157,000	157,000	157,000	7,000	157,000		74,000
Financing Receivable, Allowance for Credit Losses	$ 162,000	261,000	261,000	261,000	$ 162,000	261,000	193,000	$ 193,000	268,000	281,000
Loans in foreclosure percentage of non-performing loans	27.00%				27.00%			32.00%
HPFC Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	$ 106,000	0	0	0	$ 106,000	0		$ 0
Financing Receivable, Allowance for Credit Losses	103,000	0	0	0	103,000	0	30,000	24,000	0	0
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	0	0	0	0	0	0		0
Financing Receivable, Allowance for Credit Losses	$ 0	$ 2,142,000	$ 2,142,000	2,142,000	$ 0	2,142,000	$ 0	$ 0	$ 2,618,000	$ 2,384,000
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of real estate properties | property	3				3			7
Other real estate owned	$ 736,000				$ 736,000			$ 1,000,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of real estate properties | property	2				2			2
Other real estate owned	$ 75,000				$ 75,000			$ 241,000
Fixed Rate Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from the sale of mortgage loans	71,400,000			11,900,000	166,600,000	24,500,000
Gain on sale of mortgage loans	2,000,000			243,000	4,200,000	530,000
Loans held for sale	24,400,000				24,400,000			$ 10,800,000
Nonoperating Income (Expense) | Fixed Rate Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gain on sale of mortgage loans	(55,000)			$ (15,000)	99,000	4,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Individually Evaluated for Impairment	$ 250,000				$ 250,000
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)					13.00%
Non-Residential Building Operators Industry Sector | Loan Concentration Risk | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (percentage)					33.00%
SBM Financial, Inc.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in loans						$ 615,400,000
Extended Maturity | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs	6		0		6	0
Commitments to lend	$ 280,000				$ 280,000
HPFC Subsidiary
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due					45 days