LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 2,578,238	$ 2,490,227
Total Loans	2,578,238	2,490,227
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	792,991	859,330
Past due loans receivable	4,402	7,356
Current	10,071
Total Loans	792,991	859,330
Past Due More Than 90 days and Accruing	0	196
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,785,247	1,630,897
Past due loans receivable	12,310	14,439
Current	1,772,937	1,616,458
Total Loans	1,785,247	1,630,897
Past Due More Than 90 days and Accruing	124	50
Total commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	881,479	826,699
Total commercial real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	232,212	246,965
Past due loans receivable	1,131	941
Current	6,390
Total Loans	232,212	246,965
Past Due More Than 90 days and Accruing	0	0
Total commercial real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	649,267	579,734
Past due loans receivable	7,118	7,871
Current	642,149	571,863
Total Loans	649,267	579,734
Past Due More Than 90 days and Accruing	0	0
Total commercial real estate \| Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	36,382	26,644
Total commercial real estate \| Construction and land development \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,858	2,890
Past due loans receivable	0	0
Current	181
Total Loans	2,858	2,890
Past Due More Than 90 days and Accruing	0	0
Total commercial real estate \| Construction and land development \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	33,524	23,754
Past due loans receivable	73	0
Current	33,451	23,754
Total Loans	33,524	23,754
Past Due More Than 90 days and Accruing	0	0
Total commercial real estate \| Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	845,097	800,055
Total commercial real estate \| Other commercial real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	229,354	244,075
Past due loans receivable	1,131	941
Current	6,209
Total Loans	229,354	244,075
Past Due More Than 90 days and Accruing	0	0
Total commercial real estate \| Other commercial real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	615,743	555,980
Past due loans receivable	7,045	7,871
Current	608,698	548,109
Total Loans	615,743	555,980
Past Due More Than 90 days and Accruing	0	0
Total commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	416,725	404,870
Total commercial and industrial \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	83,189	91,208
Past due loans receivable	589	669
Current	509
Total Loans	83,189	91,208
Past Due More Than 90 days and Accruing	0	0
Total commercial and industrial \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	333,536	313,662
Past due loans receivable	1,321	953
Current	332,215	312,709
Total Loans	333,536	313,662
Past Due More Than 90 days and Accruing	0	50
Total commercial and industrial \| Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	290,382	287,227
Total commercial and industrial \| Commercial \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	45,867	52,470
Past due loans receivable	589	669
Current	509
Total Loans	45,867	52,470
Past Due More Than 90 days and Accruing	0	0
Total commercial and industrial \| Commercial \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	244,515	234,757
Past due loans receivable	1,129	857
Current	243,386	233,900
Total Loans	244,515	234,757
Past Due More Than 90 days and Accruing	0	50
Total commercial and industrial \| Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	21,647	22,317
Total commercial and industrial \| Agricultural \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	0	0
Past due loans receivable	0	0
Current	0
Total Loans	0	0
Past Due More Than 90 days and Accruing	0	0
Total commercial and industrial \| Agricultural \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	21,647	22,317
Past due loans receivable	192	96
Current	21,455	22,221
Total Loans	21,647	22,317
Past Due More Than 90 days and Accruing	0	0
Total commercial and industrial \| Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	104,696	95,326
Total commercial and industrial \| Tax exempt \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	37,322	38,738
Past due loans receivable	0	0
Current	0
Total Loans	37,322	38,738
Past Due More Than 90 days and Accruing	0	0
Total commercial and industrial \| Tax exempt \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	67,374	56,588
Past due loans receivable	0	0
Current	67,374	56,588
Total Loans	67,374	56,588
Past Due More Than 90 days and Accruing	0	0
Total commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,298,204	1,231,569
Total commercial loans \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	315,401	338,173
Past due loans receivable	1,720	1,610
Current	6,899
Total Loans	315,401	338,173
Past Due More Than 90 days and Accruing	0	0
Total commercial loans \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	982,803	893,396
Past due loans receivable	8,439	8,824
Current	974,364	884,572
Total Loans	982,803	893,396
Past Due More Than 90 days and Accruing	0	50
Total residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,167,759	1,144,698
Total residential real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	436,316	474,509
Past due loans receivable	2,311	5,465
Current	3,152
Total Loans	436,316	474,509
Past Due More Than 90 days and Accruing	0	0
Total residential real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	731,443	670,189
Past due loans receivable	3,171	5,515
Current	728,272	664,674
Total Loans	731,443	670,189
Past Due More Than 90 days and Accruing	124	0
Total residential real estate \| Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,167,759	1,144,698
Total residential real estate \| Residential mortgages \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	436,316	474,509
Past due loans receivable	2,311	5,465
Current	3,152
Total Loans	436,316	474,509
Past Due More Than 90 days and Accruing	0	0
Total residential real estate \| Residential mortgages \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	731,443	670,189
Past due loans receivable	3,171	5,515
Current	728,272	664,674
Total Loans	731,443	670,189
Past Due More Than 90 days and Accruing	124	0
Total consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	112,275	113,960
Total consumer \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	41,274	46,648
Past due loans receivable	371	281
Current	20
Total Loans	41,274	46,648
Past Due More Than 90 days and Accruing	0	196
Total consumer \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	71,001	67,312
Past due loans receivable	700	100
Current	70,301	67,212
Total Loans	71,001	67,312
Past Due More Than 90 days and Accruing	0	0
Total consumer \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	100,458	103,189
Total consumer \| Home equity \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	40,135	45,291
Past due loans receivable	371	264
Current	20
Total Loans	40,135	45,291
Past Due More Than 90 days and Accruing	0	7
Total consumer \| Home equity \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	60,323	57,898
Past due loans receivable	674	72
Current	59,649	57,826
Total Loans	60,323	57,898
Past Due More Than 90 days and Accruing	0	0
Total consumer \| Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	11,817	10,771
Total consumer \| Other consumer \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,139	1,357
Past due loans receivable	0	17
Current	0
Total Loans	1,139	1,357
Past Due More Than 90 days and Accruing	0	189
Total consumer \| Other consumer \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	10,678	9,414
Past due loans receivable	26	28
Current	10,652	9,386
Total Loans	10,678	9,414
Past Due More Than 90 days and Accruing	0	0
30-59 Days Past Due \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	2,234	4,414
30-59 Days Past Due \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	2,808	5,260
30-59 Days Past Due \| Total commercial real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	810	631
30-59 Days Past Due \| Total commercial real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	1,031	1,146
30-59 Days Past Due \| Total commercial real estate \| Construction and land development \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
30-59 Days Past Due \| Total commercial real estate \| Construction and land development \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	73	0
30-59 Days Past Due \| Total commercial real estate \| Other commercial real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	810	631
30-59 Days Past Due \| Total commercial real estate \| Other commercial real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	958	1,146
30-59 Days Past Due \| Total commercial and industrial \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	98	149
30-59 Days Past Due \| Total commercial and industrial \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	311	460
30-59 Days Past Due \| Total commercial and industrial \| Commercial \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	98	149
30-59 Days Past Due \| Total commercial and industrial \| Commercial \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	144	395
30-59 Days Past Due \| Total commercial and industrial \| Agricultural \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
30-59 Days Past Due \| Total commercial and industrial \| Agricultural \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	167	65
30-59 Days Past Due \| Total commercial and industrial \| Tax exempt \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
30-59 Days Past Due \| Total commercial and industrial \| Tax exempt \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
30-59 Days Past Due \| Total commercial loans \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	908	780
30-59 Days Past Due \| Total commercial loans \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	1,342	1,606
30-59 Days Past Due \| Total residential real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	1,014	3,419
30-59 Days Past Due \| Total residential real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	1,194	3,565
30-59 Days Past Due \| Total residential real estate \| Residential mortgages \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	1,014	3,419
30-59 Days Past Due \| Total residential real estate \| Residential mortgages \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	1,194	3,565
30-59 Days Past Due \| Total consumer \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	312	215
30-59 Days Past Due \| Total consumer \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	272	89
30-59 Days Past Due \| Total consumer \| Home equity \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	312	198
30-59 Days Past Due \| Total consumer \| Home equity \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	253	72
30-59 Days Past Due \| Total consumer \| Other consumer \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	17
30-59 Days Past Due \| Total consumer \| Other consumer \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	19	17
60-89 Days Past Due \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	877	379
60-89 Days Past Due \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	1,528	707
60-89 Days Past Due \| Total commercial real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	63	99
60-89 Days Past Due \| Total commercial real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	831	0
60-89 Days Past Due \| Total commercial real estate \| Construction and land development \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
60-89 Days Past Due \| Total commercial real estate \| Construction and land development \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
60-89 Days Past Due \| Total commercial real estate \| Other commercial real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	63	99
60-89 Days Past Due \| Total commercial real estate \| Other commercial real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	831	0
60-89 Days Past Due \| Total commercial and industrial \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	36	26
60-89 Days Past Due \| Total commercial and industrial \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	385	66
60-89 Days Past Due \| Total commercial and industrial \| Commercial \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	36	26
60-89 Days Past Due \| Total commercial and industrial \| Commercial \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	385	60
60-89 Days Past Due \| Total commercial and industrial \| Agricultural \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
60-89 Days Past Due \| Total commercial and industrial \| Agricultural \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	6
60-89 Days Past Due \| Total commercial and industrial \| Tax exempt \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
60-89 Days Past Due \| Total commercial and industrial \| Tax exempt \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
60-89 Days Past Due \| Total commercial loans \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	99	125
60-89 Days Past Due \| Total commercial loans \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	1,216	66
60-89 Days Past Due \| Total residential real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	735	254
60-89 Days Past Due \| Total residential real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	233	641
60-89 Days Past Due \| Total residential real estate \| Residential mortgages \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	735	254
60-89 Days Past Due \| Total residential real estate \| Residential mortgages \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	233	641
60-89 Days Past Due \| Total consumer \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	43	0
60-89 Days Past Due \| Total consumer \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	79	0
60-89 Days Past Due \| Total consumer \| Home equity \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	43	0
60-89 Days Past Due \| Total consumer \| Home equity \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	72	0
60-89 Days Past Due \| Total consumer \| Other consumer \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
60-89 Days Past Due \| Total consumer \| Other consumer \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	7	0
90 Days or Greater Past Due \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	1,291	2,563
90 Days or Greater Past Due \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	7,974	8,472
90 Days or Greater Past Due \| Total commercial real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	258	211
90 Days or Greater Past Due \| Total commercial real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	5,256	6,725
90 Days or Greater Past Due \| Total commercial real estate \| Construction and land development \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
90 Days or Greater Past Due \| Total commercial real estate \| Construction and land development \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
90 Days or Greater Past Due \| Total commercial real estate \| Other commercial real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	258	211
90 Days or Greater Past Due \| Total commercial real estate \| Other commercial real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	5,256	6,725
90 Days or Greater Past Due \| Total commercial and industrial \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	455	494
90 Days or Greater Past Due \| Total commercial and industrial \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	625	427
90 Days or Greater Past Due \| Total commercial and industrial \| Commercial \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	455	494
90 Days or Greater Past Due \| Total commercial and industrial \| Commercial \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	600	402
90 Days or Greater Past Due \| Total commercial and industrial \| Agricultural \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
90 Days or Greater Past Due \| Total commercial and industrial \| Agricultural \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	25	25
90 Days or Greater Past Due \| Total commercial and industrial \| Tax exempt \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
90 Days or Greater Past Due \| Total commercial and industrial \| Tax exempt \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
90 Days or Greater Past Due \| Total commercial loans \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	713	705
90 Days or Greater Past Due \| Total commercial loans \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	5,881	7,152
90 Days or Greater Past Due \| Total residential real estate \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	562	1,792
90 Days or Greater Past Due \| Total residential real estate \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	1,744	1,309
90 Days or Greater Past Due \| Total residential real estate \| Residential mortgages \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	562	1,792
90 Days or Greater Past Due \| Total residential real estate \| Residential mortgages \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	1,744	1,309
90 Days or Greater Past Due \| Total consumer \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	16	66
90 Days or Greater Past Due \| Total consumer \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	349	11
90 Days or Greater Past Due \| Total consumer \| Home equity \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	16	66
90 Days or Greater Past Due \| Total consumer \| Home equity \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	349	0
90 Days or Greater Past Due \| Total consumer \| Other consumer \| Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	0	0
90 Days or Greater Past Due \| Total consumer \| Other consumer \| Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past due loans receivable	$ 0	$ 11

LOANS - Summary of Total Loans (Details) - USD ($)
$ in Thousands

Jun. 30, 2019

Dec. 31, 2018

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans receivable

$ 2,578,238

$ 2,490,227

Total Loans

2,578,238

2,490,227

Acquired Loans

Accounts, Notes, Loans and Financing Receivable [Line Items]