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LOANS (Schedule of Loan Balances by Portfolio Class) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Total loans	$ 3,702,532	$ 3,310,104
Net deferred costs	1,908	2,040
Total loans including net deferred costs	3,704,440	3,312,144
Residential Portfolio Segment [Member] | Junior Lien [Member]
Total loans	7,073	9,206
Consumer and Other [Member]
Total loans	99,247	73,621
Primary Residential Mortgages [Member] | Residential Portfolio Segment [Member]
Total loans	605,569	557,970
Home Equity Lines of Credit [Member] | Residential Portfolio Segment [Member]
Total loans	67,497	65,683
Total loans including net deferred costs	67,497	65,682
Multifamily Property [Member] | Residential Portfolio Segment [Member]
Total loans	1,388,958	1,459,594
Total loans including net deferred costs	1,388,958	1,459,594
Owner Occupied Property [Member] | Commercial Real Estate Portfolio Segment [Member]
Total loans	253,492	176,123
Investment Property [Member] | Commercial Real Estate Portfolio Segment [Member]
Total loans	874,098	752,258
Construction Loans [Member]
Total loans including net deferred costs		1,405
Construction Loans [Member] | Commercial Portfolio Segment [Member]
Total loans	92	1,497
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member]
Total loans	316,294	213,983
Lease Financing [Member]
Total loans	$ 90,052
Total loans (in percent)	2.43%
Agricultural Sector [Member]
Total loans	$ 160	$ 169
Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	100.00%	100.00%
Loans and Finance Receivables, Gross [Member] | Residential Portfolio Segment [Member] | Junior Lien [Member]
Total loans (in percent)	0.19%	0.28%
Loans and Finance Receivables, Gross [Member] | Consumer and Other [Member]
Total loans (in percent)	2.68%	2.22%
Loans and Finance Receivables, Gross [Member] | Primary Residential Mortgages [Member] | Residential Portfolio Segment [Member]
Total loans (in percent)	16.35%	16.86%
Loans and Finance Receivables, Gross [Member] | Home Equity Lines of Credit [Member] | Residential Portfolio Segment [Member]
Total loans (in percent)	1.82%	1.98%
Loans and Finance Receivables, Gross [Member] | Multifamily Property [Member] | Residential Portfolio Segment [Member]
Total loans (in percent)	37.51%	44.09%
Loans and Finance Receivables, Gross [Member] | Owner Occupied Property [Member] | Commercial Real Estate Portfolio Segment [Member]
Total loans (in percent)	6.85%	5.32%
Loans and Finance Receivables, Gross [Member] | Investment Property [Member] | Commercial Real Estate Portfolio Segment [Member]
Total loans (in percent)	23.61%	22.73%
Loans and Finance Receivables, Gross [Member] | Construction Loans [Member] | Commercial Portfolio Segment [Member]
Total loans (in percent)	0.01%	0.04%
Loans and Finance Receivables, Gross [Member] | Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member]
Total loans (in percent)	8.54%	6.47%
Loans and Finance Receivables, Gross [Member] | Agricultural Sector [Member]
Total loans (in percent)	0.01%	0.01%

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