Note 2 - Securities (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Debt Securities, Available-for-Sale [Table Text Block]

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
March 31, 2023
U.S. Government agency debt obligations	$	454,000,000	$	0	$	(57,780,000	)	$	396,220,000
Mortgage-backed securities		37,164,000		22,000		(5,596,000	)		31,590,000
Municipal general obligation bonds		168,721,000		1,081,000		(6,731,000	)		163,071,000
Municipal revenue bonds		30,812,000		200,000		(2,420,000	)		28,592,000
Other investments		500,000		0		0			500,000
	$	691,197,000	$	1,303,000	$	(72,527,000	)	$	619,973,000
December 31, 2022
U.S. Government agency debt obligations	$	453,836,000	$	0	$	(65,092,000	)	$	388,744,000
Mortgage-backed securities		38,002,000		19,000		(6,068,000	)		31,953,000
Municipal general obligation bonds		163,041,000		450,000		(9,058,000	)		154,433,000
Municipal revenue bonds		30,267,000		102,000		(3,063,000	)		27,306,000
Other investments		500,000		0		0			500,000
	$	685,646,000	$	571,000	$	(83,281,000	)	$	602,936,000

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

	Less than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
March 31, 2023
U.S. Government agency debt obligations	$	14,000,000	$	755,000	$	382,220,000	$	57,025,000	$	396,220,000	$	57,780,000
Mortgage-backed securities		29,016,000		5,508,000		1,742,000		88,000		30,758,000		5,596,000
Municipal general obligation bonds		43,446,000		940,000		67,822,000		5,791,000		111,268,000		6,731,000
Municipal revenue bonds		5,404,000		401,000		16,407,000		2,019,000		21,811,000		2,420,000
	$	91,866,000	$	7,604,000	$	468,191,000	$	64,923,000	$	560,057,000	$	72,527,000

	Less than 12 Months				12 Months or More				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
December 31, 2022
U.S. Government agency debt obligations	$	53,019,000	$	5,713,000	$	335,725,000	$	59,379,000	$	388,744,000	$	65,092,000
Mortgage-backed securities		31,127,000		6,068,000		12,000		0		31,139,000		6,068,000
Municipal general obligation bonds		97,252,000		4,516,000		32,870,000		4,542,000		130,122,000		9,058,000
Municipal revenue bonds		12,532,000		1,141,000		10,609,000		1,922,000		23,141,000		3,063,000
	$	193,930,000	$	17,438,000	$	379,216,000	$	65,843,000	$	573,146,000	$	83,281,000

Investments Classified by Contractual Maturity Date [Table Text Block]

	Weighted
	Average		Amortized		Fair
	Yield (%)		Cost		Value
Due in 2023		0.98	$	20,361,000	$	19,997,000
Due in 2024 through 2028		1.32		319,037,000		293,271,000
Due in 2029 through 2033		2.03		278,488,000		241,115,000
Due in 2034 and beyond		3.58		35,647,000		33,500,000
Mortgage-backed securities		2.12		37,164,000		31,590,000
Other investments		8.00		500,000		500,000
Total available for sale securities		1.76	$	691,197,000	$	619,973,000