Note 2 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Due within one year, AFS, amortized cost	$ 257,665
Due within one year, AFS, fair value	257,556
Due within one year, HTM, carrying value	24,863
Due within one year, HTM, fair value	23,530
Due after one year but within five years, AFS, amortized cost	33,170
Due after one year but within five years, AFS, fair value	31,969
Due after one year but within five years, HTM, carrying value	0
Due after one year but within five years, HTM, fair value	0
Due after five years but within 10 years, AFS, amortized cost	92,360
Due after five years but within 10 years, AFS, fair value	82,127
Due after five years but within 10 years, HTM, carrying value	0
Due after five years but within 10 years, HTM, fair value	0
Due after 10 years, AFS, amortized cost	73,832
Due after 10 years, AFS, fair value	70,019
Due after 10 years, HTM, carrying value	502
Due after 10 years, HTM, fair value	492
Mortgage-backed securities – government agencies, AFS, amortized cost	655,139
Mortgage-backed securities – government agencies, AFS, fair value	572,191
Mortgage backed securities - government agencies, HTM, carrying value	182,615
Mortgage backed securities - government agencies, HTM, fair value	163,249
Total available for sale debt securities, amortized cost	1,112,166	$ 1,114,961
Total available for sale debt securities, fair value	1,013,862	990,114
Total held to maturity debt securities, carrying value	207,980	370,171
Total held to maturity debt securities, fair value	$ 187,271	$ 341,357