CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net earnings	$ 27,402	$ 26,279	$ 20,596
Adjustments to reconcile net earnings to net cash provided from operating activities:
Depreciation	4,117	3,886	3,400
Amortization	1,349	1,378	1,228
Deferred taxes	(3,056)	(534)	68
Premium amortization, net of discount accretion	3,988	3,820	4,210
Net realized loss on securities transactions	0	22	50
Gain on sale of loans	(6,834)	(2,850)	(2,308)
Gain on sale of branch operations	0	0	(830)
Provision for credit losses	13,200	1,250	2,250
Origination of loans held for sale	(161,169)	(76,011)	(70,841)
Proceeds from loans held for sale	164,829	78,288	73,250
Write-down of other real estate and repossessed assets	358	343	407
Net loss (gain) on sale of premises, equipment, other real estate owned and other assets	37	78	(133)
Stock based compensation	749	663	592
Net change in accrued interest receivable and other assets	(3,908)	(16,698)	(5,955)
Net change in accrued interest payable and other liabilities	1,459	12,132	2,230
Net cash provided by operating activities	42,521	32,046	28,214
Securities available for sale:
Purchases	(662,046)	(706,238)	(429,762)
Proceeds from sales	0	3,957	411,796
Proceeds from maturities and principal repayments	657,653	730,272	27,093
Securities held to maturity:
Proceeds from maturities and principal repayments	3,024	5,646	9,331
Cash paid in connection with acquisitions	0	0	(6,423)
Net originations of loans	(159,357)	(46,940)	(146,531)
Purchases of premises and equipment	(5,902)	(5,090)	(2,833)
Proceeds from sale of premises, equipment, other real estate owned and other assets	860	653	3,668
Net cash used in investing activities	(165,768)	(17,740)	(108,734)
Cash flows from financing activities
Net change in deposits	329,586	85,324	13,739
Net change in securities sold under agreements to repurchase	4,531	(1,128)	(651)
Proceeds from FHLB advances	390,000	260,500	391,000
Repayment of FHLB advances	(336,017)	(320,518)	(331,517)
Proceeds from line of credit	30,000	0	0
Repayment of line of credit	(18,000)	0	0
Proceeds from issuance of debentures	10,000	0	0
Repayments of debentures	(1,000)	(2,000)	(1,000)
Purchase of treasury stock	(16,927)	(10,140)	(4,265)
Exercise of stock options	638	925	327
Cash dividends	(8,487)	(8,065)	(7,031)
Net cash provided by financing activities	384,324	4,898	60,602
Net change in cash and cash equivalents	261,077	19,204	(19,918)
Cash and cash equivalents at beginning of period	90,714	71,510	91,428
Cash and cash equivalents at end of period	351,791	90,714	71,510
Supplemental disclosures of cash flow information
Interest paid	13,898	23,700	18,813
Income taxes paid	8,245	5,536	5,218
Supplemental schedule of noncash investing and financing activities
Cash dividends accrued	2,188	2,076	2,013
Transfer of loans to other real estate owned and repossessed assets	666	340	1,304
Common stock issued in acquisitions	0	0	29,568
Acquired banks
Securities held to maturity:
Cash received from acquired banks	$ 0	$ 0	$ 24,927