Securities Available for Sale (Tables)

12 Months Ended

Dec. 31, 2022

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, 2022 and 2021 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss):

				Gross		Gross
		Amortized		Unrealized		Unrealized
	2022	Cost		Gains		Losses			Fair Value
U.S. Treasury and U.S. government sponsored    entities		$	149,712	$	0	$	(21,616	)	$	128,096
State and political subdivisions			651,705		266		(121,891	)		530,080
Corporate bonds			4,181		0		(302	)		3,879
Mortgage-backed securities - residential			672,784		12		(117,654	)		555,142
Collateralized mortgage obligations			52,291		0		(4,937	)		47,354
Small Business Administration			3,839		0		(365	)		3,474
Totals		$	1,534,512	$	278	$	(266,765	)	$	1,268,025

				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

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:

		2022			2021			2020
Proceeds	$	37,190		$	35,175		$	60,341
Gross gains		6			863			394
Gross losses		(421	)		(25	)		(824	)

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, 2022
	Amortized
Maturity	Cost		Fair Value
Within one year	$	325	$	321
One to five years		27,624		25,346
Five to ten years		156,929		135,626
Beyond ten years		620,720		500,762
Mortgage-backed Securities, Collateralized Mortgage    Obligations and Small Business Administration		728,914		605,970
Totals	$	1,534,512	$	1,268,025

Investment Securities with Unrealized Losses

The following table summarizes the investment securities with unrealized losses at December 31, 2022 and 2021 aggregated by major security type and length of time in a continuous unrealized loss position.

2022
	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	$	52,311	$	(5,835	)	$	75,685	$	(15,781	)	$	127,996	$	(21,616	)
State and political subdivisions		306,709		(56,650	)		191,584		(65,241	)		498,293		(121,891	)
Corporate bonds		2,893		(122	)		986		(180	)		3,879		(302	)
Mortgage-backed securities - residential		101,476		(13,545	)		453,233		(104,109	)		554,709		(117,654	)
Collateralized mortgage obligations		42,140		(4,137	)		5,214		(800	)		47,354		(4,937	)
Small Business Administration		1,295		(122	)		2,179		(243	)		3,474		(365	)
Total temporarily impaired	$	506,824	$	(80,411	)	$	728,881	$	(186,354	)	$	1,235,705	$	(266,765	)

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	)