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AFS Securities (Tables)

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Amortized cost and fair value of available-for-sale securities

The amortized cost and fair value of AFS securities, with gross unrealized gains and losses, are as follows at:

			September 30, 2021
			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
U.S. Treasury			$	192,556					$	36					$	523					$	192,069
States and political subdivisions			124,122						4,665						98						128,689
Auction rate money market preferred			3,200						46						—						3,246
Mortgage-backed securities			59,966						2,064						—						62,030
Collateralized mortgage obligations			97,875						2,892						—						100,767
Corporate			7,650						14						81						7,583
Total			$	485,369					$	9,717					$	702					$	494,384

			December 31, 2020
			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
States and political subdivisions			$	137,710					$	5,946					$	—					$	143,656
Auction rate money market preferred			3,200						37						—						3,237
Mortgage-backed securities			85,926						2,726						—						88,652
Collateralized mortgage obligations			97,430						4,553						—						101,983
Corporate			1,700						—						—						1,700
Total			$	325,966					$	13,262					$	—					$	339,228

Amortized cost and fair value of available-for-sale securities by contractual maturity

The amortized cost and fair value of AFS securities by contractual maturity at September 30, 2021 are as follows:

			Maturing																								Securities with Variable Monthly Payments or Noncontractual Maturities
			Due in One Year or Less						After One Year But Within Five Years						After Five Years But Within Ten Years						After Ten Years												Total
U.S. Treasury			$	—					$	162,175					$	30,381					$	—					$	—					$	192,556
States and political subdivisions			15,042						60,038						21,498						27,544						—						124,122
Auction rate money market preferred			—						—						—						—						3,200						3,200
Mortgage-backed securities			—						—						—						—						59,966						59,966
Collateralized mortgage obligations			—						—						—						—						97,875						97,875
Corporate			—						—						6,150						1,500						—						7,650
Total amortized cost			$	15,042					$	222,213					$	58,029					$	29,044					$	161,041					$	485,369
Fair value			$	15,154					$	224,172					$	58,858					$	30,157					$	166,043					$	494,384

Schedule of Realized Gain (Loss) [Table Text Block]

A summary of the sales activity of AFS securities was as follows for the:

			Three Months Ended September 30												Nine Months Ended September 30
			2021						2020						2021						2020
Proceeds from sales of AFS securities			$	—					$	—					$	—					$	26,855
Realized gains (losses)			$	—					$	—					$	—					$	71
Applicable income tax expense (benefit)			$	—					$	—					$	—					$	15

Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value

The following information pertains to AFS securities with gross unrealized losses at September 30, 2021, aggregated by investment category and length of time that individual securities have been in a continuous loss position. There were no AFS securities with gross unrealized losses in a continuous loss position at December 31, 2020.

			September 30, 2021
			Less Than Twelve Months												Twelve Months or More
			Gross Unrealized Losses						Fair Value						Gross Unrealized Losses						Fair Value						Total Unrealized Losses
U.S. Treasury			$	523					$	161,652					$	—					$	—					$	523
States and political subdivisions			98						14,939						—						—						98
Corporate			81						4,369						—						—						81
Total			$	702					$	180,960					$	—					$	—					$	702
Number of securities in an unrealized loss position:									37												—						37

X

- Definition

Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 55
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Publisher FASB
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Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

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Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales.

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