Securities - Contractual maturities of debt securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 10,832
Due after one but within five years	42,015
Due after five but within ten years	124,757
Due after ten years	342,498
Total of securities having specified maturity period	520,102
Mortgage-backed securities and collateralized mortgage obligations	813,676
Amortized Cost	1,333,778		$ 1,361,797
Fair Value
Due in one year or less	10,694
Due after one but within five years	40,930
Due after five but within ten years	121,091
Due after ten years	300,920
Total of securities having specified maturities period	473,635
Mortgage-backed securities and collateralized mortgage obligations	708,860
TOTAL	1,182,495		$ 1,195,990
Gross gains	0	$ 0
Gross loss	$ 0	$ 0