CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Cash flows from operating activities
Net earnings	$ 5,091	$ 4,139	$ 14,084	$ 11,631
Adjustments to reconcile net earnings to net cash provided from operating activities:
Depreciation			2,457	2,385
Amortization			881	782
Deferred taxes			577	(214)
Premium amortization, net of discount accretion			3,247	3,581
Net realized gain on securities transactions	(1)	0	50	(25)
Gain on sale of loans	(637)	(589)	(1,871)	(1,490)
Provision for loan losses	500	800	1,750	2,250	$ 2,850
Origination of loans held for sale			(56,276)	(50,230)
Proceeds from loans held for sale			59,217	50,883
Write-down of other real estate and repossessed assets			392	9
Net loss on sale of premises, equipment, other real estate owned and other assets			478	111
Stock based compensation			378	247
Net change in accrued interest receivable and other assets			(5,170)	1,680
Net change in accrued interest payable and other liabilities			1,768	1,624
Net cash provided by operating activities			21,962	23,224
Securities available for sale:
Purchases			(124,914)	(313,177)
Proceeds from sales			111,813	213,813
Proceeds from maturities and principal repayments			20,697	18,925
Securities held to maturity:
Proceeds from sales		0	0	923
Proceeds from maturities and principal repayments			8,184	7,497
Cash paid in connection with acquisitions			(6,423)	0
Cash received from acquired banks			24,927	0
Net purchases of premises and equipment			(2,924)	(1,678)
Net proceeds from sale of premises, equipment, other real estate owned and other assets			1,898	1,830
Net increase in loans			(138,024)	(64,438)
Net cash used in investing activities			(104,766)	(136,305)
Cash flows from financing activities
Net change in deposits			(20,402)	40,511
Net change in securities sold under agreements to repurchase			(1,772)	2,061
Proceeds from FHLB advances			325,000	60,000
Repayment of FHLB advances			(251,513)	(50,013)
Proceeds from other debt			0	2,000
Repayment of other debt			0	(20,286)
Repayments of debentures			(1,000)	(5,500)
Purchase of treasury stock			(9)	0
Exercise of stock options			140	84
Sale of common stock			0	55,755
Cash dividends			(5,017)	(4,013)
Net cash provided by financing activities			45,427	80,599
Net change in cash and cash equivalents			(37,377)	(32,482)
Cash and cash equivalents at beginning of period			91,428	127,543	127,543
Cash and cash equivalents at end of period	$ 54,051	$ 95,061	54,051	95,061	$ 91,428
Supplemental disclosures of cash flow information
Interest paid			13,137	8,958
Income taxes paid			4,008	4,910
Supplemental schedule of noncash investing and financing activities
Transfer loans to other real estate owned and repossessed assets			591	992
Common stock issued in acquisitions			29,568	0
Transfer of KSOP shares			0	34,300
Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income			486	0
Net change in fair value of KSOP shares			$ 0	$ 2,639