Loan Portfolio and Allowance for Credit Losses, Based on Impairment Review Method (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment	$ 0		$ 0
Collectively evaluated for impairment	49,772		48,578
Total ending allowance balance	49,772	$ 49,220	48,578	$ 46,914	$ 46,685	$ 46,032
Loans [Abstract]
Individually evaluated for impairment	25,386		24,729
Collectively evaluated for impairment	5,012,926		4,978,150
Total loans	5,038,312		5,002,879
Commercial Loans [Member]
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	3,429		2,735
Total ending allowance balance	3,429	2,742	2,735	2,610	2,708	2,596
Loans [Abstract]
Individually evaluated for impairment	1,158		957
Collectively evaluated for impairment	281,283		272,558
Total loans	282,441		273,515
1 to 4 Family Residential Real Estate [Member]
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	46,129		45,625
Total ending allowance balance	46,129	46,295	45,625	44,067	43,766	43,271
Loans [Abstract]
Individually evaluated for impairment	24,098		23,628
Collectively evaluated for impairment	4,716,605		4,688,850
Total loans	4,740,703		4,712,478
Installment Loans [Member]
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	214		218
Total ending allowance balance	214	$ 183	218	$ 237	$ 211	$ 165
Loans [Abstract]
Individually evaluated for impairment	130		144
Collectively evaluated for impairment	15,038		16,742
Total loans	$ 15,168		$ 16,886