Note 6 - Investment Securities (Tables)

6 Months Ended

Jun. 30, 2021

Investments Debt And Equity Securities [Abstract]

Debt Securities Available-for-sale

The amortized cost and estimated fair values of investment securities available-for-sale at June 30, 2021 and December 31, 2020 were as follows:

			Gross		Gross
			unrealized		unrealized
	Fair		holding		holding			Amortized
June 30, 2021	value		gains		losses			cost
U.S. Government agency	$	68,879	$	15	$	(1,084	)	$	69,948
State and municipal		116,657		1,939		(688	)		115,406
U.S. Government agencies and sponsored enterprises (GSEs):
Mortgage-backed		265,793		2,204		(1,055	)		264,644
Collateralized mortgage obligations (CMOs)		90,147		1,254		(235	)		89,128
Pooled trust preferred		72		—		(12	)		84
Corporate debt		7,837		195		—			7,642
Total investment debt securities available-for-sale	$	549,385	$	5,607	$	(3,074	)	$	546,852

			Gross		Gross
			unrealized		unrealized
	Fair		holding		holding			Amortized
December 31, 2020	value		gains		losses			cost
U.S. Government agency	$	69,776	$	26	$	(246	)	$	69,996
State and municipal		87,812		2,350		(45	)		85,507
U.S. Government agencies and sponsored enterprises (GSEs):
Mortgage-backed		175,847		3,328		(24	)		172,543
Collateralized mortgage obligations (CMOs)		94,948		1,751		(5	)		93,202
Pooled trust preferred		70		—		(14	)		84
Corporate debt		7,193		59		(29	)		7,163
Total investment debt securities available-for-sale	$	435,646	$	7,514	$	(363	)	$	428,495

Investment Securities by Contractual Maturity

The amortized cost and estimated fair value of securities available-for-sale by contractual maturity at June 30, 2021 are shown in the following table.

June 30, 2021	Fair value		Amortized cost
Due in one year or less	$	6,391	$	6,343
Due after one year through five years		328,734		326,189
Due after five years through ten years		121,665		122,199
Due after ten years		92,595		92,121
Total investment debt securities available-for-sale	$	549,385	$	546,852

Realized Gain (Loss) on Investments

The following table presents information related to the Company’s gains and losses on the sales and calls of securities available-for-sale, and losses recognized for the other-than-temporary impairment (“OTTI”) of these investments.

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2021		2020		2021		2020
Gross realized gains	$	2	$	1	$	5	$	6
Gross realized losses		—		—		—		(5	)
Other-than-temporary impairment		—		—		—		—
Total net gains (losses) on AFS securities	$	2	$	1	$	5	$	1

Debt Securities in a Continuous Unrealized Loss Position

The following table indicates the length of time individual debt securities have been in a continuous unrealized loss position as of June 30, 2021 and December 31, 2020:

			Less than 12 months					12 months or longer					Total
	No. of		Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
June 30, 2021	securities		value		losses			value		losses			value		losses
U.S. Government agency		32	$	62,908	$	(1,084	)	$	—	$	—		$	62,908	$	(1,084	)
State and municipal		70		44,351		(688	)		—		—		$	44,351	$	(688	)
U.S. Government agencies and sponsored enterprises (GSEs):													$	—	$	—
Mortgage-backed		37		121,209		(1,055	)		—		—		$	121,209	$	(1,055	)
Collateralized mortgage obligations (CMOs)		14		26,879		(235	)		38		—		$	26,917	$	(235	)
Pooled trust preferred		1		—		—			72		(12	)	$	72	$	(12	)
Corporate debt		—		—		—			—		—		$	—	$	—
Total		154	$	255,347	$	(3,062	)	$	110	$	(12	)	$	255,457	$	(3,074	)

			Less than 12 months					12 months or longer					Total
	No. of		Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
December 31, 2020	securities		value		losses			value		losses			value		losses
U.S. Government agency		19	$	37,754	$	(246	)	$	—	$	—		$	37,754	$	(246	)
State and municipal		11		6,821		(45	)		—		—			6,821		(45	)
U.S. Government agencies and sponsored enterprises (GSEs):
Mortgage-backed		4		8,626		(24	)		—		—			8,626		(24	)
Collateralized mortgage obligations (CMOs)		3		3,262		(5	)		—		—			3,262		(5	)
Pooled trust preferred		1		—		—			70		(14	)		70		(14	)
Corporate debt		1		2,971		(29	)		—		—			2,971		(29	)
Total		39	$	59,434	$	(349	)	$	70	$	(14	)	$	59,504	$	(363	)

Summary of Unrealized and Realized Gains and Losses Recognized in Net Income on Equity Securities

The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three and six months ended June 30, 2021 and 2020:

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2021		2020		2021		2020
Net gains (loss) recognized during the period on equity securities	$	871	$	1,334	$	2,306	$	(1,606	)
Less:  Net gains recognized during the period on equity securities sold during the period		292		168		631		168
Net unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date	$	579	$	1,166	$	1,675	$	(1,774	)