Note 2 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Due within one year, AFS, amortized cost	$ 255,139
Due within one year, AFS, fair value	255,083
Due within one year, HTM, carrying value	14
Due within one year, HTM, fair value	14
Due after one year but within five years, AFS, amortized cost	32,719
Due after one year but within five years, AFS, fair value	31,413
Due after one year but within five years, HTM, carrying value	2,631
Due after one year but within five years, HTM, fair value	2,568
Due after five years but within 10 years, AFS, amortized cost	95,161
Due after five years but within 10 years, AFS, fair value	83,672
Due after five years but within 10 years, HTM, carrying value	22,338
Due after five years but within 10 years, HTM, fair value	20,765
Due after 10 years, AFS, amortized cost	80,251
Due after 10 years, AFS, fair value	76,104
Due after 10 years, HTM, carrying value	465
Due after 10 years, HTM, fair value	451
Mortgage-backed securities – government agencies, AFS, amortized cost	677,301
Mortgage-backed securities – government agencies, AFS, fair value	587,967
Mortgage backed securities - government agencies, HTM, carrying value	187,003
Mortgage backed securities - government agencies, HTM, fair value	165,219
Total available for sale debt securities, amortized cost	1,140,571	$ 1,114,961
Total available for sale debt securities, fair value	1,034,239	990,114
Total held to maturity debt securities, carrying value	212,451
Total held to maturity debt securities, fair value	$ 189,017	$ 341,357