Note 3 - Securities (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Marketable Securities [Table Text Block]

	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

(Dollars in thousands)	December 31, 2020
	Amortized		Unrealized		Unrealized
	Cost		Gains		Losses		Fair Value
Securities available for sale:
U.S. Treasury	$	34,997	$	1	$	—	$	34,998
Federal agencies and GSEs		104,092		1,976		45		106,023
Mortgage-backed and CMOs		246,770		6,117		105		252,782
State and municipal		57,122		1,979		2		59,099
Corporate		13,011		188		10		13,189
Total securities available for sale	$	455,992	$	10,261	$	162	$	466,091

Investments Classified by Contractual Maturity Date [Table Text Block]

	Available for Sale
	Amortized
	Cost		Fair Value
Due in one year or less	$	52,314	$	52,315
Due after one year through five years		185,555		185,333
Due after five years through ten years		84,768		84,381
Due after ten years		14,021		14,128
Mortgage-backed and CMOs		357,981		356,310
	$	694,639	$	692,467

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

	For the Year Ended December 31,
	2021		2020		2019
Gross realized gains	$	35	$	814	$	328
Gross realized losses		—		—		(54	)
Proceeds from sales of securities		561		5,811		29,878

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	$	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

	Total				Less than 12 Months				12 Months or More
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
U.S. Treasury	$	21,237	$	45	$	19,974	$	26	$	1,263	$	19
Federal agencies and GSEs		46,640		105		46,640		105		—		—
Mortgage-backed and CMOs		3,456		2		3,456		2		—		—
State and municipal		5,990		10		5,990		10		—		—
Total	$	77,323	$	162	$	76,060	$	143	$	1,263	$	19