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Note 2 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Due within one year, AFS, amortized cost	$ 50,527
Due within one year, AFS, fair value	48,848
Due within one year, HTM, carrying value	24,501
Due within one year, HTM, fair value	23,197
Due after one year but within five years, AFS, amortized cost	24,427
Due after one year but within five years, AFS, fair value	23,662
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	88,282
Due after five years but within 10 years, AFS, fair value	80,217
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	39,169
Due after 10 years, AFS, fair value	36,509
Due after 10 years, HTM, carrying value	501
Due after 10 years, HTM, fair value	495
Mortgage-backed securities – government agencies, AFS, amortized cost	622,953
Mortgage-backed securities – government agencies, AFS, fair value	548,284
Mortgage backed securities - government agencies, HTM, carrying value	178,117
Mortgage backed securities - government agencies, HTM, fair value	160,119
Total available for sale debt securities, amortized cost	825,358	$ 1,114,961
Total available for sale debt securities, fair value	737,520	990,114
Total held to maturity debt securities, carrying value	203,119	370,171
Total held to maturity debt securities, fair value	$ 183,811	$ 341,357

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