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Securities (Tables)
3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Amortized cost and estimated fair value of investment and mortgage-backed securities
The amortized cost, gross unrealized gains and losses and estimated fair value of investment and mortgage-backed AFS and HTM securities as of March 31, 2022 and December 31, 2021 are reflected in the tables below (in thousands):
 March 31, 2022
Amortized
Gross
Unrealized
Gross UnrealizedEstimated
AVAILABLE FOR SALECostGainsLossesFair Value
Investment securities:
State and political subdivisions$1,614,421 $10,637 $58,873 $1,566,185 
Corporate bonds and other 144,264 253 3,191 141,326 
MBS: (1)
   
Residential280,804 2,581 2,694 280,691 
Commercial78,108 262 588 77,782 
Total$2,117,597 $13,733 $65,346 $2,065,984 
HELD TO MATURITY
Investment securities:   
State and political subdivisions$386,573 $944 $12,767 $374,750 
MBS: (1)
Residential37,986 387 64 38,309 
Commercial49,760 62 260 49,562 
Total $474,319 $1,393 $13,091 $462,621 

 December 31, 2021
Amortized
Gross
Unrealized
Gross UnrealizedEstimated
AVAILABLE FOR SALECostGainsLossesFair Value
Investment securities: 
U.S. Treasury
$58,084 $843 $50 $58,877 
State and political subdivisions1,962,257 93,893 4,214 2,051,936 
Corporate bonds and other 133,333 2,408 209 135,532 
MBS: (1)
 
Residential
411,727 14,895 272 426,350 
Commercial
90,193 1,642 205 91,630 
Total$2,655,594 $113,681 $4,950 $2,764,325 
HELD TO MATURITY
Investment securities:
State and political subdivisions$788 $$— $791 
MBS: (1)
 
Residential38,644 2,103 — 40,747 
Commercial51,348 2,349 — 53,697 
Total$90,780 $4,455 $— $95,235 
(1) All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.
Unrealized loss on securities
The following tables present the fair value and unrealized losses on AFS and HTM investment securities and MBS, if applicable, for which an allowance for credit losses has not been recorded as of March 31, 2022 and December 31, 2021, segregated by major security type and length of time in a continuous loss position (in thousands):
March 31, 2022
 Less Than 12 MonthsMore Than 12 MonthsTotal
Fair Value
Unrealized
Loss
Fair Value
Unrealized
Loss
Fair Value
Unrealized
Loss
AVAILABLE FOR SALE      
Investment securities:
State and political subdivisions$1,030,604 $58,873 $— $— $1,030,604 $58,873 
Corporate bonds and other108,153 3,191 — — 108,153 3,191 
MBS:
Residential106,742 2,113 4,572 581 111,314 2,694 
Commercial9,939 32 3,709 556 13,648 588 
Total$1,255,438 $64,209 $8,281 $1,137 $1,263,719 $65,346 
HELD TO MATURITY
Investment securities:
State and political subdivisions$223,589 $12,576 $17,255 $191 $240,844 $12,767 
MBS:
Residential3,617 64 — — 3,617 64 
Commercial22,857 260 — — 22,857 260 
Total$250,063 $12,900 $17,255 $191 $267,318 $13,091 
December 31, 2021
Less Than 12 Months
More Than 12 Months
Total
Fair Value
Unrealized
Loss
Fair Value
Unrealized
Loss
Fair Value
Unrealized
Loss
AVAILABLE FOR SALE      
Investment securities:
U.S. Treasury$9,947 $50 $— $— $9,947 $50 
State and political subdivisions260,509 3,622 7,608 592 268,117 4,214 
Corporate bonds and other35,597 209 — — 35,597 209 
MBS:
Residential1,225 5,168 269 6,393 272 
Commercial4,274 4,674 198 8,948 205 
Total$311,552 $3,891 $17,450 $1,059 $329,002 $4,950 
Interest income recognized on securities
The following table reflects interest income recognized on securities for the periods presented (in thousands):
 Three Months Ended
March 31,
 20222021
U.S. Treasury$168 $37 
State and political subdivisions13,332 10,406 
Corporate bonds and other1,327 845 
MBS4,017 6,088 
Total interest income on securities$18,844 $17,376 
Amortized cost, carrying value and fair value of securities presented by contractual maturity
The amortized cost and estimated fair value of AFS and HTM securities at March 31, 2022, are presented below by contractual maturity (in thousands):
 March 31, 2022
 Amortized CostFair Value
AVAILABLE FOR SALE
Investment securities:  
Due in one year or less$2,247 $2,265 
Due after one year through five years24,972 25,187 
Due after five years through ten years157,846 155,194 
Due after ten years1,573,620 1,524,865 
 1,758,685 1,707,511 
MBS:358,912 358,473 
Total$2,117,597 $2,065,984 

 March 31, 2022
 Amortized Cost
Fair Value
HELD TO MATURITY
Investment securities:  
Due in one year or less$120 $120 
Due after one year through five years529 530 
Due after five years through ten years139 140 
Due after ten years385,785 373,960 
 386,573 374,750 
MBS:87,746 87,871 
Total$474,319 $462,621 
Unrealized and realized gains (losses) recognized in net income on equity investments
The following is a summary of unrealized and realized gains and losses on equity investments recognized in other noninterest income in the consolidated statements of income during the periods presented (in thousands):
 Three Months Ended
March 31,
 20222021
Net gains (losses) recognized during the period on equity investments$(275)$(107)
Less: Net gains recognized during the period on equity investments sold during the period— — 
Unrealized gains (losses) recognized during the reporting period on equity investments held at the reporting date$(275)$(107)