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LOANS (Schedule of Balances by Portfolio Class, Based on Impairment Method) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Total Loans Individually Evaluated for Impairment	$ 30,711		$ 23,065
Ending ALLL Attributable to Loans Individually Evaluated for Impairment	1,616		522
Total Loans Collectively Evaluated for Impairment	3,689,276		3,679,467
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	36,450		35,918
Total Loans	3,719,987		3,702,532
Total Ending ALLL	38,066	$ 37,696	36,440	$ 35,751	$ 33,610	$ 32,208
Residential Portfolio Segment [Member] | Primary Residential Mortgages [Member]
Total Loans Individually Evaluated for Impairment	8,441		9,802
Ending ALLL Attributable to Loans Individually Evaluated for Impairment	366		482
Total Loans Collectively Evaluated for Impairment	586,645		595,767
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	4,016		3,603
Total Loans	595,086		605,569
Total Ending ALLL	4,382	4,403	4,085	4,223	3,928	3,666
Residential Portfolio Segment [Member] | Home Equity Lines of Credit [Member]
Total Loans Individually Evaluated for Impairment	25		27
Ending ALLL Attributable to Loans Individually Evaluated for Impairment	0
Total Loans Collectively Evaluated for Impairment	54,995		67,470
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	190		221
Total Loans	55,020		67,497
Total Ending ALLL	190	192	221	211	231	233
Residential Portfolio Segment [Member] | Multifamily Property [Member]
Total Loans Individually Evaluated for Impairment	0
Ending ALLL Attributable to Loans Individually Evaluated for Impairment	0
Total Loans Collectively Evaluated for Impairment	1,320,251		1,388,958
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	8,259		10,007
Total Loans	1,320,251		1,388,958
Total Ending ALLL	8,259	9,140	10,007	11,606	11,767	11,192
Residential Portfolio Segment [Member] | Junior Lien [Member]
Total Loans Individually Evaluated for Impairment	46		52
Ending ALLL Attributable to Loans Individually Evaluated for Impairment	0
Total Loans Collectively Evaluated for Impairment	7,623		7,021
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	17		12
Total Loans	7,669		7,073
Total Ending ALLL	17	16	12	14	15	16
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Property [Member]
Total Loans Individually Evaluated for Impairment	1,998		2,503
Ending ALLL Attributable to Loans Individually Evaluated for Impairment	0
Total Loans Collectively Evaluated for Impairment	251,522		250,989
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	2,525		2,385
Total Loans	253,520		253,492
Total Ending ALLL	2,525	2,364	2,385	2,147	2,235	1,774
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member]
Total Loans Individually Evaluated for Impairment	20,201		10,681
Ending ALLL Attributable to Loans Individually Evaluated for Impairment	1,250		40
Total Loans Collectively Evaluated for Impairment	872,325		863,417
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	12,409		11,893
Total Loans	892,526		874,098
Total Ending ALLL	13,659	12,367	11,933	11,727	10,883	10,909
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Total Loans Collectively Evaluated for Impairment	90		92
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	1		1
Total Loans	90		92
Total Ending ALLL	1	1	1	1	1	9
Consumer and Other Loans [Member]
Total Loans Collectively Evaluated for Impairment	69,330		99,247
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	364		349
Total Loans	69,330		99,247
Total Ending ALLL	364	422	349	309	236	243
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member]
Total Loans Individually Evaluated for Impairment	0
Ending ALLL Attributable to Loans Individually Evaluated for Impairment	0
Total Loans Collectively Evaluated for Impairment	399,828		316,294
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	7,356		6,563
Total Loans	399,828		316,294
Total Ending ALLL	7,356	7,753	6,563	5,333	4,312	4,164
Lease Financing [Member]
Total Loans Individually Evaluated for Impairment	0
Ending ALLL Attributable to Loans Individually Evaluated for Impairment	0
Total Loans Collectively Evaluated for Impairment	126,514		90,052
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	1,311		884
Total Loans	126,514		90,052
Total Ending ALLL	1,311		884
Agricultural Sector [Member]
Total Loans Collectively Evaluated for Impairment	153		160
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	2
Total Loans	153		$ 160
Total Ending ALLL	$ 2	$ 2		$ 2	$ 2	$ 2

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