Securities - Contractual maturities of debt securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 11,882		$ 11,882
Due after one but within five years	45,341		45,341
Due after five but within ten years	119,992		119,992
Due after ten years	340,767		340,767
Total of securities having specified maturity period	517,982		517,982
Mortgage-backed securities and collateralized mortgage obligations	799,273		799,273
Amortized Cost	1,317,255		1,317,255		$ 1,361,797
Fair Value
Due in one year or less	11,793		11,793
Due after one but within five years	44,025		44,025
Due after five but within ten years	116,682		116,682
Due after ten years	295,589		295,589
Total of securities having specified maturities period	468,089		468,089
Mortgage-backed securities and collateralized mortgage obligations	701,867		701,867
TOTAL	1,169,956		1,169,956		$ 1,195,990
Gross loss	$ 0	$ 0	$ 3	$ 0