LOANS (Schedule of Balances by Portfolio Class, Based on Impairment Method) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Total Loans Individually Evaluated for Impairment	$ 31,300	$ 23,065
Ending ALLL Attributable to Loans Individually Evaluated for Impairment	262	522
Total Loans Collectively Evaluated for Impairment	3,893,012	3,679,467
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	38,242	35,918
Total Loans	3,924,312	3,702,532
Total Ending ALLL	38,504	36,440	$ 32,208	$ 25,856
Residential Portfolio Segment [Member] | Primary Residential Mortgages [Member]
Total Loans Individually Evaluated for Impairment	9,518	9,802
Ending ALLL Attributable to Loans Individually Evaluated for Impairment	262	482
Total Loans Collectively Evaluated for Impairment	591,373	595,767
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	3,244	3,603
Total Loans	600,891	605,569
Total Ending ALLL	3,506	4,085	3,666	2,297
Residential Portfolio Segment [Member] | Home Equity Lines of Credit [Member]
Total Loans Individually Evaluated for Impairment	255	27
Total Loans Collectively Evaluated for Impairment	61,936	67,470
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	164	221
Total Loans	62,191	67,497
Total Ending ALLL	164	221	233	86
Residential Portfolio Segment [Member] | Multifamily Property [Member]
Total Loans Individually Evaluated for Impairment	1,262
Total Loans Collectively Evaluated for Impairment	1,134,543	1,388,958
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	5,959	10,007
Total Loans	1,135,805	1,388,958
Total Ending ALLL	5,959	10,007	11,192	11,813
Residential Portfolio Segment [Member] | Junior Lien [Member]
Total Loans Individually Evaluated for Impairment	36	52
Total Loans Collectively Evaluated for Impairment	7,382	7,021
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	15	12
Total Loans	7,418	7,073
Total Ending ALLL	15	12	16	66
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Property [Member]
Total Loans Individually Evaluated for Impairment	1,574	2,503
Total Loans Collectively Evaluated for Impairment	259,619	250,989
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	2,614	2,385
Total Loans	261,193	253,492
Total Ending ALLL	2,614	2,385	1,774	1,679
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member]
Total Loans Individually Evaluated for Impairment	18,655	10,681
Ending ALLL Attributable to Loans Individually Evaluated for Impairment		40
Total Loans Collectively Evaluated for Impairment	983,263	863,417
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	14,248	11,893
Total Loans	1,001,918	874,098
Total Ending ALLL	14,248	11,933	10,909	7,590
Commercial Portfolio Segment [Member] | Construction [Member]
Total Loans Collectively Evaluated for Impairment	86	92
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	1	1
Total Loans	86	92
Total Ending ALLL	1	1	9	2
Consumer and Other [Member]
Total Loans Collectively Evaluated for Impairment	65,180	99,247
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	384	349
Total Loans	65,180	99,247
Total Ending ALLL	384	349	243	112
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member]
Total Loans Collectively Evaluated for Impairment	616,838	316,294
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	9,839	6,563
Total Loans	616,838	316,294
Total Ending ALLL	9,839	6,563	4,164	2,209
Lease Financing [Member]
Total Loans Collectively Evaluated for Impairment	172,643	90,052
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	1,772	884
Total Loans	172,643	90,052
Total Ending ALLL	1,772	884
Agricultural Sector [Member]
Total Loans Collectively Evaluated for Impairment	149	160
Ending ALLL Attributable to Loans Collectively Evaluated for Impairment	2
Total Loans	149	$ 160
Total Ending ALLL	$ 2		$ 2	$ 2