Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net income (loss)	$ 62,621	$ 7,821	$ 57,688
Adjustments to reconcile net income (loss) to net cash from operating activities:
Stock-based compensation	4,048	3,213	3,325
Depreciation	5,377	4,516	4,466
Amortization of operating lease right-of-use asset	475	604	714
Amortization of cloud computing implementation costs	138	188	188
Provision (reversal) for credit losses	2,546	1,873	125
Net amortization (accretion) of purchase valuation adjustments	(1,997)	(618)	(3,979)
Amortization (accretion) of premiums and discounts on securities	(2,480)	4,041	6,302
Amortization of intangible assets	4,408	3,518	4,186
Deferred income taxes	796	(2,435)	2,594
Federal Home Loan Bank stock dividends	(1,082)	(594)	(369)
Loss (gain) on sales and valuation adjustments on other real estate owned	(7,906)	218	80
Net loss (gain) on sales and settlements of securities	267	52,013	(79)
Change in unrealized (gains) losses on equity securities	(487)	(104)	74
Loss (gain) on disposal of premises and equipment	(66)	(103)	(41)
Loss (gain) on lease termination	0	173
Loss (gain) on sales of foreclosed assets	95	58	(345)
Loss (gain) on sales of loans	54	(472)	(1,085)
Originations of loans held for sale	(34,506)	(24,964)	(46,140)
Proceeds from the sale of loans held for sale	37,441	24,967	50,774
Increase in the value of bank-owned life insurance	(4,966)	(4,059)	(3,113)
Change in fair value of derivatives recognized in earnings	(95)	522	(1,477)
Gain on acquisition and branch sales	(2,131)		(962)
Payments on operating lease payable	(612)	(915)	(771)
Net change in:
Interest receivable	(614)	(4,867)	(2,973)
Other assets	11,224	6,166	22,466
Interest payable and other liabilities	1,297	5,767	(17,575)
Net cash provided by operating activities	73,845	76,527	74,073
Cash flows (to) from investing activities
Purchases of available-for-sale securities	(183,909)	(510,224)	(182,036)
Purchases of held-to-maturity securities	(3,188)	(275)	(1,950)
Proceeds from sales, calls, pay-downs and maturities of available-for-sale securities	288,344	789,390	168,409
Proceeds from calls, pay-downs and maturities of held-to-maturity securities	226	17	3
Net change in loans	16,236	(23,715)	(181,896)
Purchase of mortgage loans			(1,399)
Purchase of government guaranteed loans	(49,086)	(1,235)	(2,293)
Capitalized construction cost of other real estate owned		(562)	(12)
Purchase of premises and equipment	(8,493)	(15,575)	(3,479)
Proceeds from sale of premises and equipment	706	163	164
Proceeds from sale of foreclosed assets	928	110	29,888
Net redemptions (purchases) of Federal Home Loan Bank and Federal Reserve Bank stock	(5,863)	1,681	(3,816)
Net redemptions (purchases) of correspondent and miscellaneous other stock	(543)	(11,855)	(4,546)
Proceeds from sale of other real estate owned	9,397	1,874	9,323
Purchase of bank-owned life insurance	(60,000)
Proceeds from bank-owned life insurance death benefits and policy surrenders	56,799	2,376	723
Net cash (used in) provided by investing activities	123,729	232,170	(214,184)
Cash flows (to) from financing activities
Net increase (decrease) in deposits	(163,038)	(96,436)	(106,330)
Net change in federal funds purchased and retail repurchase agreements	(15,934)	(2,896)	(9,528)
Net borrowings (repayments) on Federal Home Loan Bank line of credit	72,024	(138,864)	138,864
Proceeds from Federal Home Loan Bank term advances	1,200,000	1,366,091	413,973
Principal repayments on Federal Home Loan Bank term advances	(1,201,000)	(1,266,091)	(413,973)
Proceeds from Federal Reserve Bank borrowings	1,000	141,000	1,000
Principal payments on Federal Reserve Bank borrowings	(141,000)	(1,000)	(1,000)
Principal payments on bank stock loan	(691)
Proceeds from issuance of common stock, net	86,980
Proceeds from exercise of employee stock options	3,506	203	2,011
Proceeds from employee stock purchase plan	726	784	792
Purchase of treasury stock	(11,859)	(17,900)	(33,186)
Net change in contractual obligations	(15,748)	(12,303)	(2,474)
Dividends paid on common stock	(7,892)	(6,614)	(5,564)
Net cash provided by (used in) financing activities	(192,926)	(34,026)	(15,415)
Net change in cash and cash equivalents	4,648	274,671	(155,526)
Cash and cash equivalents, beginning of period	379,099	104,428	259,954
Ending cash and cash equivalents	383,747	379,099	104,428
Supplemental cash flow information:
Interest paid	116,193	80,807	25,803
Income taxes paid, net of refunds	6,195	3,467	1,218
Supplemental noncash disclosures:
Other real estate owned acquired in settlement of loans	2,656	1,086	2,369
Other real estate owned transferred from premise and equipment	1,822		2,210
Other repossessed assets acquired in settlement of loans	5,454	505	47
Operating leases recognized	784	690
Other real estate owned recorded as a result of transferring non-operational branch right-of-use-asset			2,071
Purchase of investments in tax credit structures and resulting contractual obligations	8,500	$ 16,400
Rockhold [Member]
Cash flows (to) from investing activities
Net cash (paid) received from acquisition	60,914
Supplemental noncash disclosures:
Total fair value of assets acquired, net of cash	301,018
Total fair value of liabilities acquired	360,632
KansasLand Bank [Member]
Cash flows (to) from investing activities
Net cash (paid) received from acquisition	1,261
Supplemental noncash disclosures:
Total fair value of assets acquired, net of cash	50,572
Total fair value of liabilities acquired	$ 51,002
United Bank & Trust [Member]
Cash flows (to) from investing activities
Net cash (paid) received from branch sale			(22,939)
Supplemental noncash disclosures:
Total fair value of assets sold, net of cash			29,762
Total fair value of liabilities assumed			52,733
High Plains Bank [Member]
Cash flows (to) from investing activities
Net cash (paid) received from branch sale			(18,328)
Supplemental noncash disclosures:
Total fair value of assets sold, net of cash			490
Total fair value of liabilities assumed			$ 19,064