Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
INTEREST INCOME
Loans receivable, including fees	$ 84,706,000	$ 58,616,000
Interest and dividends on investment securities, cash and cash equivalents, and certificates of deposit at other financial institutions	4,919,000	3,710,000
Total interest and dividend income	89,625,000	62,326,000
INTEREST EXPENSE
Deposits	16,162,000	7,321,000
Borrowings	2,476,000	2,228,000
Subordinated note	679,000	679,000
Total interest expense	19,317,000	10,228,000
NET INTEREST INCOME	70,308,000	52,098,000
PROVISION FOR LOAN LOSSES	2,880,000	1,540,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	67,428,000	50,558,000
NONINTEREST INCOME
Service charges and fee income	6,554,000	3,233,000
Bargain purchase gain		7,414,000
Gain on sale of loans	14,248,000	14,861,000
Loss on disposed fixed assets	(26,000)	(71,000)
Gain on sale of investment securities	32,000	171,000
Earnings on cash surrender value of BOLI	872,000	413,000
Other noninterest income	1,355,000	829,000
Total noninterest income	23,035,000	26,850,000
NONINTEREST EXPENSE
Salaries and benefits	33,816,000	28,538,000
Operations	9,722,000	6,709,000
Occupancy	4,640,000	3,042,000
Data processing	4,972,000	2,870,000
Gain on sale of OREO	(138,000)
OREO expenses	13,000	2,000
Loan costs	3,238,000	2,801,000
Professional and board fees	2,426,000	1,872,000
Federal Deposit Insurance Corporation ("FDIC") insurance	358,000	517,000
Marketing and advertising	678,000	747,000
Acquisition costs	1,756,000	1,389,000
Amortization of core deposit intangible	760,000	351,000
Impairment of servicing rights	92,000
Total noninterest expense	62,333,000	48,838,000
INCOME BEFORE PROVISION FOR INCOME TAXES	28,130,000	28,570,000
PROVISION FOR INCOME TAXES	5,413,000	4,223,000
NET INCOME	$ 22,717,000	$ 24,347,000
Basic earnings per share (in dollars per share)	$ 5.13	$ 6.58
Diluted earnings per share (in dollars per share)	$ 5.01	$ 6.29