Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INTEREST INCOME:
Loans receivable	$ 79,120	$ 70,936	$ 57,039
Investment securities:
Taxable	2,750	1,952	1,535
Nontaxable	3,700	2,185	1,955
Other	697	313	317
Total interest income	86,267	75,386	60,846
INTEREST EXPENSE:
Deposits	6,992	6,515	5,339
Other borrowings	3,755	1,403	1,025
Total interest expense	10,747	7,918	6,364
NET INTEREST INCOME	75,520	67,468	54,482
PROVISION FOR LOAN LOSSES	4,498	2,516	1,797
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	71,022	64,952	52,685
NONINTEREST INCOME:
Net gain on sales of investment securities	48	19	20
Deposit fee income	9,970	8,994	7,907
Earnings on life insurance policies	2,940	1,665	1,510
Gain on sales of loans	3,773	4,796	3,084
Other	1,008	1,237	1,026
Total noninterest income	17,739	16,711	13,547
NONINTEREST EXPENSES:
Salaries and employee benefits	28,519	31,168	25,742
Net occupancy expense	6,987	7,414	6,411
Real estate owned, net	(2)	(377)	(369)
FDIC insurance	1,078	1,099	960
Amortization of intangible assets	1,021	1,021	724
Data processing	5,769	5,520	6,411
Professional fees	1,860	2,212	1,923
Advertising and public relations	1,148	1,600	2,520
Postage and supplies	836	1,121	1,113
Other	7,239	6,567	5,584
Total noninterest expenses	54,455	57,345	51,019
INCOME BEFORE INCOME TAXES	34,306	24,318	15,213
INCOME TAX PROVISION	12,995	6,859	4,639
NET INCOME	$ 21,311	$ 17,459	$ 10,574
Basic earnings per common share (in dollars per share)	$ 0.57	$ 0.46	$ 0.31
Diluted earnings per common share (in dollars per share)	$ 0.56	$ 0.46	$ 0.30