Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Assets [Abstract]
Cash and due from banks		$ 71,676	$ 94,466
Federal funds sold and interest bearing due from banks		88,547	171,493
Total cash and cash equivalents		160,223	265,959
Mortgage loans held for sale, at fair value		6,462	6,056
Available for sale debt securities (amortized cost of $1,123,119 in 2024 and $1,154,153 in 2023, respectively)		993,808	1,031,179
Held to maturity debt securities (fair value of $351,869 in 2024 and $408,519 in 2023, respectively)		385,404	439,837
Federal Home Loan Bank stock, at cost		24,675	16,236
Loans	[1]	5,849,715	5,771,038
Allowance for credit losses on loans		(80,897)	(79,374)
Net loans		5,768,818	5,691,664
Premises and equipment, net		106,730	101,174
Premises held for sale		2,482	2,502
Bank owned life insurance		87,514	86,927
Accrued interest receivable		26,074	26,830
Goodwill		194,074	194,074
Other Assets		347,612	287,360
Total assets		8,123,128	8,170,102
Liabilities
Non-interest bearing		1,481,217	1,548,624
Interest bearing		5,127,863	5,122,124
Total deposits		6,609,080	6,670,748
Securities sold under agreements to repurchase		162,528	152,991
Federal funds purchased		9,961	12,852
Subordinated debentures		26,806	26,740
Federal Home Loan Bank advances		200,000	200,000
Accrued interest payable		2,194	2,094
Other liabilities		237,848	246,574
Total liabilities		7,248,417	7,311,999
Commitments and contingent liabilities (Footnote 12)
Stockholders’ equity
Preferred stock, no par value. Authorized 1,000,000 shares; no shares issued or outstanding		0	0
Common stock, no par value. Authorized 40,000,000 shares; issued and outstanding 29,393,000 and 29,329,000 shares in 2024 and 2023, respectively		58,812	58,602
Additional paid-in capital		389,685	385,955
Retained earnings		521,268	506,344
Accumulated other comprehensive loss		(95,054)	(92,798)
Total stockholders’ equity		874,711	858,103
Total liabilities and equity		8,123,128	8,170,102
Core Deposits [Member]
Assets [Abstract]
Intangible		11,272	11,944
Customer Lists [Member]
Assets [Abstract]
Intangible		$ 7,980	$ 8,360

[1] Total loans are presented inclusive of premiums, discounts and net loan origination fees and costs.