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AFS Securities (Tables)
 9 Months Ended
Sep. 30, 2022
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, 2022
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. Treasury$231,723 $— $24,932 $206,791 
States and political subdivisions121,414 111 7,525 114,000 
Auction rate money market preferred3,200 — 721 2,479 
Mortgage-backed securities45,087 — 4,045 41,042 
Collateralized mortgage obligations223,181 — 13,461 209,720 
Corporate8,150 — 949 7,201 
Total$632,755 $111 $51,633 $581,233 
 December 31, 2021
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
U.S. Treasury$212,379 $— $2,676 $209,703 
States and political subdivisions116,836 4,457 88 121,205 
Auction rate money market preferred3,200 42 — 3,242 
Mortgage-backed securities54,710 1,438 — 56,148 
Collateralized mortgage obligations90,435 1,876 10 92,301 
Corporate8,150 19 167 8,002 
Total$485,710 $7,832 $2,941 $490,601 
Amortized cost and fair value of available-for-sale securities by contractual maturity The amortized cost and fair value of AFS securities by contractual maturity at September 30, 2022 are as follows:
MaturingSecurities with Variable Monthly Payments or Noncontractual Maturities
Due in
One Year
or Less		After One
Year But
Within
Five Years		After Five
Years But
Within
Ten Years		After
Ten Years		Total
U.S. Treasury$— $231,723 $— $— $— $231,723 
States and political subdivisions15,459 45,580 21,500 38,875 — 121,414 
Auction rate money market preferred— — — — 3,200 3,200 
Mortgage-backed securities— — — — 45,087 45,087 
Collateralized mortgage obligations— — — — 223,181 223,181 
Corporate— — 8,150 — — 8,150 
Total amortized cost$15,459 $277,303 $29,650 $38,875 $271,468 $632,755 
Fair value$15,394 $251,517 $27,523 $33,558 $253,241 $581,233 
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value The following information pertains to AFS securities with gross unrealized losses at September 30, 2022 and December 31, 2021, aggregated by investment category and length of time that individual securities have been in a continuous loss position.
 September 30, 2022
 Less Than Twelve MonthsTwelve Months or More 
Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Total
Unrealized
Losses
U.S. Treasury$6,996 $62,985 $17,936 $143,806 $24,932 
States and political subdivisions4,192 57,140 3,333 42,925 7,525 
Auction rate money market preferred— — 721 2,479 721 
Mortgage-backed securities4,045 41,042 — — 4,045 
Collateralized mortgage obligations13,461 209,720 — — 13,461 
Corporate232 1,768 717 5,433 949 
Total$28,926 $372,655 $22,707 $194,643 $51,633 
Number of securities in an unrealized loss position:249 305 554 
 December 31, 2021
 Less Than Twelve MonthsTwelve Months or More
Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Total
Unrealized
Losses
U.S. Treasury$2,676 $209,703 $— $— $2,676 
States and political subdivisions88 9,674 — — 88 
Collateralized mortgage obligations10 11,165 — — 10 
Corporate167 6,283 — — 167 
Total$2,941 $236,825 $— $— $2,941 
Number of securities in an unrealized loss position:40 — 40