Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 8,627,000	$ 8,905,000	$ 4,945,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	2,300,000	900,000	1,557,000
Write down of other real estate owned	563,000	3,000,000	355,000
Depreciation and amortization	5,447,000	4,618,000	3,518,000
Deferred income taxes	1,527,000	(5,056,000)	(380,000)
Stock based compensation	2,116,000	1,842,000	759,000
Loss (gain) on sale of investment securities	67,000	146,000	(656,000)
Impairment charges on investment securities			7,000
Amortization of premiums on investment securities	2,878,000	2,469,000	1,980,000
Accretion of discounts on retained SBA loans	(1,332,000)	(1,088,000)	(1,364,000)
Fair value adjustments on SBA servicing assets	1,458,000	1,187,000	1,075,000
Proceeds from sales of SBA loans originated for sale	42,726,000	42,269,000	58,107,000
SBA loans originated for sale	(42,700,000)	(37,062,000)	(53,627,000)
Gains on sales of SBA loans originated for sale	(3,105,000)	(3,378,000)	(4,981,000)
Proceeds from sales of mortgage loans originated for sale	322,264,000	311,187,000	163,414,000
Mortgage loans originated for sale	(291,870,000)	(321,222,000)	(161,717,000)
Fair value adjustment for mortgage loans originated for sale	513,000	(846,000)	(483,000)
Gains on mortgage loans originated for sale	(8,378,000)	(8,128,000)	(3,712,000)
Amortization of intangible assets		61,000	43,000
Amortization of debt issuance costs	6,000	29,000	24,000
Increase in accrued interest receivable and other assets	(5,047,000)	(2,330,000)	(2,729,000)
Net increase (decrease) in accrued interest payable and other liabilities	1,570,000	1,513,000	(846,000)
Net cash provided by (used in) operating activities	39,630,000	(984,000)	5,289,000
Cash flows from investing activities
Purchase of investment securities available for sale	(149,209,000)	(165,065,000)	(207,482,000)
Purchase of investment securities held to maturity	(123,265,000)	(89,350,000)	(294,187,000)
Proceeds from the sale of securities available for sale	6,439,000	31,197,000	78,585,000
Proceeds from the paydown, maturity, or call of securities available for sale	48,796,000	48,547,000	36,982,000
Proceeds from the paydown, maturity, or call of securities held to maturity	63,565,000	37,315,000	33,160,000
Net (purchase) redemption of restricted stock	(3,836,000)	(552,000)	1,693,000
Net increase in loans	(275,587,000)	(197,965,000)	(89,428,000)
Net proceeds from sale of other real estate owned	495,000	499,000	1,400,000
Net cash paid in acquisition			(5,913,000)
Premises and equipment expenditures	(18,161,000)	(22,525,000)	(14,291,000)
Net cash used in investing activities	(450,763,000)	(357,899,000)	(459,481,000)
Cash flows from financing activities
Net proceeds from stock offering			99,175,000
Net proceeds from exercise of stock options	670,413	646,263	726,157
Net increase in demand, money market and savings deposits	292,053,000	380,052,000	384,786,000
Net increase in time deposits	37,519,000	5,573,000	43,586,000
Increase (repayment) in short-term borrowings	91,422,000		(66,666,000)
Net cash provided by financing activities	421,664,000	386,271,000	461,607,000
Net increase in cash and cash equivalents	10,531,000	27,388,000	7,415,000
Cash and cash equivalents, beginning of year	61,942,000	34,554,000	27,139,000
Cash and cash equivalents, end of year	72,473,000	61,942,000	34,554,000
Supplemental disclosures
Interest paid	15,905,000	8,935,000	6,664,000
Income taxes paid		75,000	190,000
Non-cash transfers from loans to other real estate owned	315,000	291,000	616,000
Conversion of subordinated debt to common stock	10,094,000	229,000
Transfer of available-for-sale securities to held-to-maturity securities	$ 230,094,000