Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income:
Loans, including loan fees	$ 31,334	$ 28,997	$ 92,511	$ 84,644
Investment securities:
Taxable	1,904	1,564	5,578	4,503
Tax-exempt	503	572	1,574	1,737
Other interest income	926	747	2,733	2,326
Total interest income	34,667	31,880	102,396	93,210
Interest expense:
Deposits	4,596	4,055	14,103	11,012
Short-term borrowings	0	0	0	8
Long-term borrowings	881	883	2,684	2,571
Total interest expense	5,477	4,938	16,787	13,591
Net interest income	29,190	26,942	85,609	79,619
Provision for loan losses	400	340	900	1,360
Net interest income after provision for loan losses	28,790	26,602	84,709	78,259
Noninterest income:
Mortgage income, net	3,700	1,902	6,962	4,510
BOLI income	495	1,019	1,834	1,929
Asset gains (losses), net	286	146	8,030	1,322
Other income	1,166	1,484	4,274	4,243
Total noninterest income	12,312	10,649	40,058	29,712
Noninterest expense:
Personnel	12,914	12,983	40,809	38,149
Occupancy, equipment and office	3,454	3,660	10,961	10,901
Business development and marketing	1,428	1,334	4,288	4,139
Data processing	2,515	2,375	7,220	7,094
Intangibles amortization	914	1,054	2,936	3,336
Other expense	1,662	1,638	5,159	4,518
Total noninterest expense	22,887	23,044	71,373	68,137
Income before income tax expense	18,215	14,207	53,394	39,834
Income tax expense	4,603	3,268	10,788	9,431
Net income	13,612	10,939	42,606	30,403
Less: Net income attributable to noncontrolling interest	82	80	260	230
Net income attributable to Nicolet Bankshares, Inc.	$ 13,530	$ 10,859	$ 42,346	$ 30,173
Earnings per common share:
Basic (in dollars per share)	$ 1.45	$ 1.13	$ 4.51	$ 3.12
Diluted (in dollars per share)	$ 1.40	$ 1.09	$ 4.36	$ 3.02
Weighted average common shares outstanding:
Basic (in shares)	9,346,814	9,633,158	9,393,795	9,678,726
Diluted (in shares)	9,696,850	9,949,295	9,706,795	10,004,316
Trust services fee income
Noninterest income:
Fees and commissions	$ 1,594	$ 1,638	$ 4,631	$ 4,915
Brokerage fee income
Noninterest income:
Fees and commissions	2,113	1,732	5,925	5,074
Service charges on deposit accounts
Noninterest income:
Fees and commissions	1,223	1,247	3,587	3,637
Card interchange income
Noninterest income:
Fees and commissions	$ 1,735	$ 1,481	$ 4,815	$ 4,082