Securities Available for Sale (Tables)

12 Months Ended

Dec. 31, 2021

Investments Debt And Equity Securities [Abstract]

Summary of the Amortized Cost and Fair Value of Available-for-Sale Investment Securities Corresponding Amounts of Unrealized Gains and Losses

The following table summarizes the amortized cost and fair value of the available-for-sale securities portfolio at December 31, 2021 and 2020 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss):

				Gross		Gross
		Amortized		Unrealized		Unrealized
	2021	Cost		Gains		Losses			Fair Value
U.S. Treasury and U.S. government sponsored entities		$	93,137	$	32	$	(2,338	)	$	90,831
State and political subdivisions			636,724		23,296		(1,205	)		658,815
Corporate bonds			4,009		50		(29	)		4,030
Mortgage-backed securities - residential			663,405		1,875		(10,094	)		655,186
Collateralized mortgage obligations			13,303		153		(71	)		13,385
Small Business Administration			5,381		49		0			5,430
Totals		$	1,415,959	$	25,455	$	(13,737	)	$	1,427,677

				Gross		Gross
		Amortized		Unrealized		Unrealized
	2020	Cost		Gains		Losses			Fair Value
U.S. Treasury and U.S. government sponsored entities		$	11,798	$	101	$	(54	)	$	11,845
State and political subdivisions			344,160		22,350		(204	)		366,306
Corporate bonds			3,582		132		(2	)		3,712
Mortgage-backed securities - residential			157,106		4,919		(243	)		161,782
Collateralized mortgage obligations			25,654		742		(3	)		26,393
Small Business Administration			5,411		151		0			5,562
Totals		$	547,711	$	28,395	$	(506	)	$	575,600

Proceeds from Sales of Available-for-Sale Securities and the Associated Gains and Losses

The proceeds from sales of available-for-sale securities and the associated gains and losses were as follows:

		2021			2020			2019
Proceeds	$	35,175		$	60,341		$	33,424
Gross gains		863			394			211
Gross losses		(25	)		(824	)		(222	)

Amortized Cost and Fair Value of the Debt Securities Maturity

The amortized cost and fair value of the debt securities portfolio are shown by expected maturity. Expected maturities may differ from contractual maturities if issuers have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.

Available for sale	December 31, 2021
	Amortized
Maturity	Cost		Fair Value
Within one year	$	1,539	$	1,550
One to five years		14,132		14,897
Five to ten years		133,000		132,717
Beyond ten years		585,199		604,512
Mortgage-backed securities, collateralized mortgage obligations and Small Business Administration		682,089		674,001
Totals	$	1,415,959	$	1,427,677

Investment Securities with Unrealized Losses

The following table summarizes the investment securities with unrealized losses at December 31, 2021 and 2020 aggregated by major security type and length of time in a continuous unrealized loss position.

2021
	Less than 12 Months					12 Months or More					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
Description of Securities	Value		Loss			Value		Loss			Value		Loss
U.S. Treasury and U.S. government
sponsored entities	$	81,236	$	(1,960	)	$	8,271	$	(378	)	$	89,507	$	(2,338	)
State and political subdivisions		103,651		(1,020	)		10,020		(185	)		113,671		(1,205	)
Corporate bonds		418		(2	)		715		(27	)		1,133		(29	)
Mortgage-backed securities - residential		525,792		(7,872	)		55,569		(2,222	)		581,361		(10,094	)
Collateralized mortgage obligations		7,270		(71	)		0		0			7,270		(71	)
Total temporarily impaired	$	718,367	$	(10,925	)	$	74,575	$	(2,812	)	$	792,942	$	(13,737	)

2020
	Less than 12 Months					12 Months or More				Total
	Fair		Unrealized			Fair		Unrealized		Fair		Unrealized
Description of Securities	Value		Loss			Value		Loss		Value		Loss
U.S. Treasury and U.S. government
sponsored entities	$	8,153	$	(54	)	$	0	$	0	$	8,153	$	(54	)
State and political subdivisions		19,205		(204	)		0		0		19,205		(204	)
Corporate bonds		198		(2	)		0		0		198		(2	)
Mortgage-backed securities - residential		63,401		(243	)		0		0		63,401		(243	)
Collateralized mortgage obligations		294		(3	)		0		0		294		(3	)
Total temporarily impaired	$	91,251	$	(506	)	$	0	$	0	$	91,251	$	(506	)