Loan Portfolio and Allowance for Credit Losses, Based on Impairment Review Method (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment	$ 0		$ 0
Collectively evaluated for impairment	51,265		50,248
Total ending allowance balance	51,265	$ 50,606	50,248	$ 49,772	$ 49,220	$ 48,578
Loans [Abstract]
Individually evaluated for impairment	24,277		24,390
Collectively evaluated for impairment	5,132,424		5,073,668
Total loans	5,156,701		5,098,058
Commercial Loans [Member]
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	3,134		3,420
Total ending allowance balance	3,134	3,023	3,420	3,429	2,742	2,735
Loans [Abstract]
Individually evaluated for impairment	780		443
Collectively evaluated for impairment	313,493		286,414
Total loans	314,273		286,857
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	47,877		46,636
Total ending allowance balance	47,877	47,307	46,636	46,129	46,295	45,625
Loans [Abstract]
Individually evaluated for impairment	23,461		23,835
Collectively evaluated for impairment	4,806,289		4,773,728
Total loans	4,829,750		4,797,563
Installment Loans [Member]
Ending allowance balance attributable to loans [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	254		192
Total ending allowance balance	254	$ 276	192	$ 214	$ 183	$ 218
Loans [Abstract]
Individually evaluated for impairment	36		112
Collectively evaluated for impairment	12,642		13,526
Total loans	$ 12,678		$ 13,638