Note 3 - Securities (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Marketable Securities [Table Text Block]

	December 31, 2022
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
Securities available for sale:
U.S. Treasury	$	152,033	$	—	$	12,606	$	139,427
Federal agencies and GSEs		90,363		4		7,019		83,348
Mortgage-backed and CMOs		336,393		1		42,301		294,093
State and municipal		69,023		12		5,312		63,723
Corporate		31,299		—		3,828		27,471
Total securities available for sale	$	679,111	$	17	$	71,066	$	608,062

(Dollars in thousands)	December 31, 2021
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
Securities available for sale:
U.S. Treasury	$	150,751	$	—	$	1,174	$	149,577
Federal agencies and GSEs		104,518		993		931		104,580
Mortgage-backed and CMOs		357,981		2,854		4,525		356,310
State and municipal		65,939		1,021		488		66,472
Corporate		15,450		218		140		15,528
Total securities available for sale	$	694,639	$	5,086	$	7,258	$	692,467

Investments Classified by Contractual Maturity Date [Table Text Block]

	Available for Sale
	Amortized
	Cost		Fair Value
Due in one year or less	$	44,859	$	43,579
Due after one year through five years		208,162		191,338
Due after five years through ten years		74,582		65,037
Due after ten years		15,114		14,015
Mortgage-backed and CMOs		336,394		294,093
	$	679,111	$	608,062

Realized Gain (Loss) on Investments [Table Text Block]

	For the Year Ended December 31,
	2022		2021		2020
Gross realized gains	$	—	$	35	$	814
Gross realized losses		—		—		—
Proceeds from sales of securities		—		561		5,811

Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]

	Total				Less than 12 Months				12 Months or More
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
U.S. Treasury	$	139,427	$	12,606	$	10,824	$	915	$	128,603	$	11,691
Federal agencies and GSEs		82,958		7,019		29,204		1,920		53,754		5,099
Mortgage-backed and CMOs		293,929		42,301		96,758		7,245		197,171		35,056
State and municipal		60,629		5,312		31,866		980		28,763		4,332
Corporate		27,471		3,828		18,991		2,556		8,480		1,272
Total	$	604,414	$	71,066	$	187,643	$	13,616	$	416,771	$	57,450

	Total				Less than 12 Months				12 Months or More
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
U.S. Treasury	$	149,577	$	1,174	$	149,577	$	1,174	$	—	$	—
Federal agencies and GSEs		73,640		931		63,042		512		10,598		419
Mortgage-backed and CMOs		253,444		4,525		213,292		3,014		40,152		1,511
State and municipal		26,646		488		23,341		354		3,305		134
Corporate		7,611		140		7,611		140		—		—
Total	$	510,918	$	7,258	$	456,863	$	5,194	$	54,055	$	2,064