CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 25,993	$ 14,933	$ 15,153
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	2,788	979	1,785
Net amortization of securities	5,214	3,415	2,403
Deferred income taxes	6,886	470	142
Change in unamortized net loan costs and premiums	(933)	(557)	295
Premises and equipment depreciation and amortization expense	3,553	1,551	1,710
Stock-based compensation expense	1,274	1,278	816
Accretion of purchase accounting entries, net	(3,337)	0	0
Amortization of other intangibles	812	92	92
Income from cash surrender value of bank-owned life insurance policies	(1,539)	(703)	(606)
Gain on sales of securities, net	(19)	(4,498)	(1,334)
Loss on premises and equipment, net	94	0	0
Net change in other assets and liabilities	(654)	(169)	(125)
Net cash provided by operating activities	40,132	16,791	20,331
Cash flows from investing activities:
Proceeds from sales of securities available for sale	1,599	66,583	22,753
Proceeds from maturities, calls and prepayments of securities available for sale	121,583	109,377	106,801
Purchases of securities available for sale	(172,116)	(210,824)	(168,432)
Purchase of bank owned life insurance	0	0	(15,000)
Net change in loans	(126,828)	(10,042)	(21,088)
Purchase of loans	(18,621)	(128,951)	(51,698)
Purchase of Federal Home Loan Bank stock	(1,325)	(3,852)	(125)
Purchase of premises and equipment, net	(3,157)	(4,296)	(1,866)
Acquisitions, net of cash (paid) acquired	39,537	0	0
Proceeds from sale of other real estate	322	119	672
Net cash used in investing activities	(159,006)	(181,886)	(127,983)
Cash flows from financing activities:
Net decrease in deposits	151,900	107,513	84,738
Net change in short-term advances from the Federal Home Loan Bank	213,593	59,700	19,200
Net change in long term advances from the Federal Home Loan Bank	(153,332)	1,234	7,382
Net change in securities sold repurchase agreements	(222)	871	1,189
Exercise of stock options	968	1,570	1,127
Purchase of treasury stock	(282)	(497)	(24)
Common stock cash dividends paid	(11,505)	(6,577)	(6,040)
Net cash provided by financing activities	201,120	163,814	107,572
Net change in cash and cash equivalents	82,246	(1,281)	(80)
Cash and cash equivalents at beginning of year	8,439	9,720	9,800
Cash and cash equivalents at end of year	90,685	8,439	9,720
Supplemental cash flow information:
Interest paid	21,399	11,944	10,362
Income taxes paid, net	9,084	6,286	5,566
Acquisition of non-cash assets and liabilities:
Assets acquired	1,454,119	0	0
Liabilities assumed	1,406,887	0	0
Other non-cash changes:
Real estate owned acquired in settlement of loans	$ 32	$ 0	$ 425