CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net earnings	$ 26,279	$ 20,596	$ 14,439
Adjustments to reconcile net earnings to net cash provided from operating activities:
Depreciation	3,886	3,400	3,162
Amortization	1,378	1,228	1,033
Premium amortization, net of discount accretion	3,820	4,210	4,576
Net realized loss (gain) on securities transactions	22	50	(167)
Gain on sale of loans	(2,850)	(2,308)	(1,981)
Gain on sale of branch operations	0	(830)	0
Provision for loan losses	1,250	2,250	2,850
Origination of loans held for sale	(76,011)	(70,841)	(64,817)
Proceeds from loans held for sale	78,288	73,250	67,465
Write-down of other real estate and repossessed assets	343	407	12
Net gain (loss) on sale of premises, equipment, other real estate owned and other assets	78	(133)	(906)
Stock based compensation	663	592	355
Net change in accrued interest receivable and other assets	(17,232)	(5,887)	2,413
Net change in accrued interest payable and other liabilities	12,132	2,230	1,235
Net cash provided by operating activities	32,046	28,214	29,669
Securities available for sale:
Purchases	(706,238)	(429,762)	(517,155)
Proceeds from sales	3,957	411,796	213,813
Proceeds from maturities and principal repayments	730,272	27,093	225,516
Securities held to maturity:
Proceeds from sales	0	0	3,298
Proceeds from maturities and principal repayments	5,646	9,331	9,516
Cash paid in connection with acquisitions	0	(6,423)	0
Net originations of loans	(46,940)	(146,531)	(118,754)
Net purchases of premises and equipment	(5,090)	(2,833)	(2,320)
Net proceeds from sale of premises, equipment, other real estate owned and other assets	653	3,668	2,279
Net cash used in investing activities	(17,740)	(108,734)	(183,807)
Cash flows from financing activities
Net change in deposits	85,324	13,739	99,529
Net change in securities sold under agreements to repurchase	(1,128)	(651)	2,020
Proceeds from FHLB advances	260,500	391,000	60,000
Repayment of FHLB advances	(320,518)	(331,517)	(70,017)
Proceeds from other debt	0	0	2,000
Repayment of other debt	0	0	(20,286)
Repayments of debentures	(2,000)	(1,000)	(5,500)
Purchase of treasury stock	(10,140)	(4,265)	0
Exercise of stock options	925	327	84
Sale of common stock	0	0	55,755
Cash dividends	(8,065)	(7,031)	(5,562)
Net cash provided by financing activities	4,898	60,602	118,023
Net change in cash and cash equivalents	19,204	(19,918)	(36,115)
Cash and cash equivalents at beginning of period	71,510	91,428	127,543
Cash and cash equivalents at end of period	90,714	71,510	91,428
Supplemental disclosures of cash flow information
Interest paid	23,700	18,813	12,119
Income taxes paid	5,536	5,218	6,660
Supplemental schedule of noncash investing and financing activities
Cash dividends accrued	2,076	2,013	1,548
Transfer loans to other real estate owned and repossessed assets	340	1,304	1,775
Common stock issued in acquisitions	0	29,568	0
Terminated KSOP put option	0	0	(34,300)
Net change in fair value of KSOP shares	0	0	2,639
Acquired banks
Securities held to maturity:
Cash received from acquired banks	$ 0	$ 24,927	$ 0