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 earnings	$ 31,491	$ 30,009	$ 40,423
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation	4,311	4,042	4,211
Amortization	702	734	724
Deferred taxes	164	346	(1,157)
Premium amortization, net of discount accretion	1,246	2,070	4,919
Net realized loss (gain) on sales of securities available for sale	0	229	(172)
Gain on sale of loans	(991)	(1,201)	(2,435)
(Reversal of) provision for credit losses	(2,200)	0	2,150
Origination of loans held for sale	(32,249)	(39,066)	(73,292)
Proceeds from loans held for sale	34,073	42,447	76,700
Write-down of other real estate and repossessed assets	923	0	19
Net gain on sale of premises, equipment, other real estate owned and other assets	(299)	(2,943)	(925)
Stock based compensation	542	594	688
Net change in accrued interest receivable and other assets	10,722	(1,860)	(14,446)
Net change in accrued interest payable and other liabilities	(1,012)	3,806	1,439
Net cash provided by operating activities	47,423	39,207	38,846
Securities available for sale:
Purchases	(2,177,093)	(1,671,050)	(641,739)
Proceeds from Sales	0	21,268	26,130
Proceeds from maturities and principal repayments	2,031,252	1,641,283	628,160
Securities held to maturity:
Purchases	0	0	(457,452)
Proceeds from maturities and principal repayments	67,856	102,681	234,150
Net repayment (originations) of loans	174,205	53,072	(470,389)
Purchases of premises and equipment	(3,317)	(6,779)	(5,684)
Proceeds from sale of premises, equipment, other real estate owned and other assets	14,805	3,558	1,860
Net cash provided by investing activities	107,708	144,033	(684,964)
Cash flows from financing activities
Net change in deposits	58,921	(47,908)	10,664
Net change in securities sold under agreements to repurchase	5,903	17,951	(6,930)
Proceeds from FHLB advances	1,595,000	3,275,000	1,135,000
Repayment of FHLB advances	(1,735,000)	(3,425,000)	(892,500)
Proceeds from line of credit	3,000	17,500	1,000
Repayment of line of credit	(7,500)	(13,000)	(6,000)
Proceeds from issuance of subordinated debt	0	0	34,436
Repayments of debentures	(4,000)	(3,500)	(5,093)
Purchase of treasury stock	(6,368)	(11,227)	(8,838)
Exercise of stock options	2,257	698	1,565
Cash dividends paid	(10,904)	(10,697)	(10,324)
Net cash (used in) financing activities	(98,691)	(200,183)	252,980
Net change in cash and cash equivalents	56,440	(16,943)	(393,138)
Cash and cash equivalents at beginning of period	89,524	106,467	499,605
Cash and cash equivalents at end of period	145,964	89,524	106,467
Supplemental disclosures of cash flow information
Interest paid	65,437	56,588	13,513
Income taxes paid	5,535	7,580	9,940
Supplemental schedule of noncash investing and financing activities
Cash dividends accrued	2,744	2,654	2,627
Lease right of use assets obtained in exchange for lease liabilities	1,215	1,695	337
Available for sale securities transferred to held to maturity, net of unrealized loss of $13,186.	0	0	106,157
Transfer of loans to other real estate owned and repossessed assets	16,311	292	70
Contributions from noncontrolling interest	$ 76	$ 0	$ 574