Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net income	$ 82,217	$ 61,063	$ 59,021
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	11,496	12,945	13,678
Accretion of acquired loans	0	0	(135)
Provision (benefit) for credit losses	7,700	6,550	(4,300)
Deferred income tax expense (benefit)	(2,036)	(1,353)	2,020
Stock-based compensation expense	3,384	3,377	3,784
Stock grants to directors for retainer fee	350	359	344
Proceeds from sales of mortgage loans held for sale	196,217	237,779	686,418
Origination of mortgage loans held for sale	(204,727)	(217,030)	(649,245)
Net gain on sales of mortgage loans held for sale	(6,532)	(8,197)	(30,402)
Net gain from sales and valuation write-downs of foreclosed assets	(419)	(69)	(78)
Net (gain) loss from sale and write-downs on former bank premises	2	275	(140)
Net (gain) loss from sales and disposals of premises and equipment	471	(36)	246
Earnings on bank owned life insurance	(1,500)	(1,678)	(1,164)
Gain on sale of branch	0	0	(1,058)
Net (gain) loss on instruments designated at fair value and related derivatives	257	(45)	224
Net change in:
Accrued interest receivable	(4,330)	(6,165)	1,528
Other assets	(30,189)	(437)	(12,655)
Accrued interest and other liabilities	14,252	32,524	(3,513)
Net cash from operating activities	66,613	119,862	64,573
Cash flows from investing activities
Purchases of securities available for sale	(19,941)	(107,011)	(298,708)
Proceeds from maturities, calls and repayments of securities available for sale	24,142	17,984	80,432
Loan originations and payments, net	(387,283)	(462,427)	(267,899)
Proceeds from Federal Home Loan Bank stock redemption	0	281	0
Purchases of Federal Home Loan Bank stock	(3,792)	0	0
Purchases of bank owned life insurance	(3,500)	(4,500)	(2,000)
Proceeds from bank owned life insurance death benefits claim	0	628	0
Net cash transferred in branch sale	0	0	(2,679)
Purchases of premises and equipment and lease activity	(6,687)	(3,017)	(5,602)
Proceeds from sales of former bank premises	598	2,994	753
Proceeds from sales of foreclosed assets	531	69	196
Net cash for investing activities	(395,932)	(554,999)	(495,507)
Cash flows from financing activities
Net (decrease) increase in time deposits	422,781	(57,189)	(120,512)
Net (decrease) increase in all other deposits	(234,674)	(313,193)	806,796
Net (decrease) increase in securities sold under agreements to repurchase	35,394	(3,123)	79,098
Proceeds from Federal Home Loan Bank advances	240,000	28,263	0
Maturities of Federal Home Loan Bank advances	(80,353)	(94,000)	(20,000)
Net proceeds from subordinated notes issuance	0	14,645	73,635
Proceeds from stock option exercises, net of cashless exercises	0	36	50
Employee stock purchase plan	45	45	48
Dividend reinvestment plan	891	867	877
Repurchases of common stock	0	0	(21,380)
Payment of cash dividends to common shareholders	(21,004)	(19,602)	(18,524)
Net cash (for) from financing activities	363,080	(443,251)	780,088
Net change in cash and cash equivalents	33,761	(878,388)	349,154
Cash and cash equivalents at beginning of period	96,772	975,160	626,006
Cash and cash equivalents at end of period	130,533	96,772	975,160
Supplemental disclosures of cash flows information
Interest	72,024	21,765	20,352
Federal income taxes	24,850	11,200	17,550
Noncash financing and investing activities:
Transfers from loans to foreclosed assets	112	0	30
Transfers from bank premises to other real estate owned	800	0	0
Transfers from premises and equipment to other assets	$ 0	$ 2,847	$ 0