Note 3 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Due within one year, AFS, amortized cost	$ 201,548
Due within one year, AFS, fair value	201,552
Due within one year, HTM, carrying value	151,882
Due within one year, HTM, fair value	151,207
Due after one year but within five years, AFS, amortized cost	36,543
Due after one year but within five years, AFS, fair value	34,910
Due after one year but within five years, HTM, carrying value	2,638
Due after one year but within five years, HTM, fair value	2,555
Due after five years but within 10 years, AFS, amortized cost	94,672
Due after five years but within 10 years, AFS, fair value	81,754
Due after five years but within 10 years, HTM, carrying value	24,251
Due after five years but within 10 years, HTM, fair value	22,250
Due after 10 years, AFS, amortized cost	85,431
Due after 10 years, AFS, fair value	80,921
Due after 10 years, HTM, carrying value	474
Due after 10 years, HTM, fair value	458
Mortgage-backed securities – government agencies, AFS, amortized cost	696,767
Mortgage-backed securities – government agencies, AFS, fair value	590,977
Mortgage backed securities - government agencies, HTM, carrying value	190,926
Mortgage backed securities - government agencies, HTM, fair value	164,887
Total available for sale debt securities, amortized cost	1,114,961	$ 1,154,153
Total available for sale debt securities, fair value	990,114	1,031,179
Total held to maturity debt securities, carrying value	370,171
Total held to maturity debt securities, fair value	$ 341,357	$ 408,519