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SECURITIES (Tables)
3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Estimated Fair Value of Securities Available for Sale
Amortized cost and estimated fair value of securities available for sale are as follows (in thousands):
 March 31, 2022
 Amortized CostUnrealized GainsUnrealized LossesEstimated Fair Value
U.S. Treasury notes and bonds$60,898 $— $3,675 $57,223 
Mortgage-backed securities, residential570,028 193 41,085 529,136 
Obligations of states and political subdivisions40,266 246 91 40,421 
Corporate bonds and notes25,750 56 492 25,314 
SBA loan pools94,899 279 929 94,249 
Total$791,841 $774 $46,272 $746,343 

 December 31, 2021
 Amortized CostUnrealized GainsUnrealized LossesEstimated Fair Value
U.S. Treasury notes and bonds$61,084 $27 $680 $60,431 
Mortgage-backed securities, residential582,060 4,032 8,731 577,361 
Obligations of states and political subdivisions40,299 2,004 — 42,303 
Corporate bonds and notes22,750 180 82 22,848 
SBA loan pools89,216 344 477 89,083 
Total$795,409 $6,587 $9,970 $792,026 
Schedule of Amortized Cost and Estimated Fair Value of Securities Held to Maturity
Amortized cost and estimated fair value of securities held to maturity are as follows (in thousands):
 March 31, 2022
 Amortized CostUnrecognized GainsUnrecognized LossesEstimated Fair Value
Obligations of states and political subdivisions$2,146 $— $— $2,146 
Time deposits with other financial institutions1,430 — — 1,430 
Total$3,576 $— $— $3,576 

 December 31, 2021
 Amortized CostUnrecognized GainsUnrecognized LossesEstimated Fair Value
Obligations of states and political subdivisions$2,157 $— $— $2,157 
Time deposits with other financial institutions1,633 — 1,639 
Total$3,790 $$— $3,796 
Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity Securities not due at a single maturity date are shown separately (in thousands):
March 31, 2022
Available for SaleHeld to Maturity
Amortized
Cost
Fair
Value
Amortized
Cost
Fair
Value
Within one year$1,303 $1,300 $2,457 $2,457 
After one, but within five years100,517 96,884 319 319 
After five, but within ten years24,624 24,304 800 800 
After ten years470 470 — — 
126,914 122,958 3,576 3,576 
Mortgage-backed securities, residential570,028 529,136 — — 
SBA loan pools94,899 94,249 — — 
Total$791,841 $746,343 $3,576 $3,576 
Schedule of Investment Securities Available for Sale in an Unrealized Loss Position
The following tables summarize the investment securities available for sale with unrealized losses at March 31, 2022 and December 31, 2021 by aggregated major security type and length of time in a continuous unrealized loss position (in thousands):
 Less than 12 months12 months or longerTotal
March 31, 2022Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasury notes and bonds$57,222 $3,675 $— $— $57,222 $3,675 
Mortgage-backed securities, residential315,115 19,657 197,549 21,428 512,664 41,085 
Obligations of states and political subdivisions11,259 91 — — 11,259 91 
Corporate bonds and notes11,268 481 1,989 11 13,257 492 
SBA loan pools44,665 686 25,071 243 69,736 929 
Total temporarily impaired securities$439,529 $24,590 $224,609 $21,682 $664,138 $46,272 

 Less than 12 months12 months or longerTotal
December 31, 2021Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. Treasury notes and bonds$49,084 $680 $— $— $49,084 $680 
Mortgage-backed securities, residential293,720 4,502 122,050 4,229 415,770 8,731 
Corporate bonds and notes4,928 72 1,989 10 6,917 82 
SBA loan pools51,235 296 13,769 181 65,004 477 
Total temporarily impaired securities$398,967 $5,550 $137,808 $4,420 $536,775 $9,970