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Investment Securities Available-For-Sale (Tables)
12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of investment securities available-for-sale
The following table shows investment securities available-for-sale.
(Dollars in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
December 31, 2021    
U.S. Treasury and Federal agencies securities$1,093,780 $3,244 $(13,018)$1,084,006 
U.S. States and political subdivisions securities95,700 1,130 (1,129)95,701 
Mortgage-backed securities - Federal agencies663,441 4,745 (8,459)659,727 
Corporate debt securities22,510 499  23,009 
Foreign government securities600  (2)598 
Total investment securities available-for-sale$1,876,031 $9,618 $(22,608)$1,863,041 
December 31, 2020    
U.S. Treasury and Federal agencies securities$610,195 $9,521 $(234)$619,482 
U.S. States and political subdivisions securities78,812 2,346 (31)81,127 
Mortgage-backed securities - Federal agencies442,748 11,237 (196)453,789 
Corporate debt securities40,813 1,556 — 42,369 
Foreign government securities700 — — 700 
Total investment securities available-for-sale$1,173,268 $24,660 $(461)$1,197,467 
Schedule of contractual maturities of investments in debt securities available-for-sale
The following table shows the contractual maturities of investments in debt securities available-for-sale at December 31, 2021. Expected maturities will differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
(Dollars in thousands)Amortized CostFair Value
Due in one year or less$105,859 $106,732 
Due after one year through five years948,501 940,267 
Due after five years through ten years157,760 155,850 
Due after ten years470 465 
Mortgage-backed securities663,441 659,727 
Total debt securities available-for-sale$1,876,031 $1,863,041 
Schedule of gross unrealized losses and fair value by investment category and age
The following table summarizes gross unrealized losses and fair value by investment category and age. At December 31, 2021, the Company’s available-for-sale securities portfolio consisted of 706 securities, 282 of which were in an unrealized loss position.
 Less than 12 Months12 months or LongerTotal
(Dollars in thousands) Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
December 31, 2021      
U.S. Treasury and Federal agencies securities$789,536 $(10,728)$84,191 $(2,290)$873,727 $(13,018)
U.S. States and political subdivisions securities39,585 (980)4,875 (149)44,460 (1,129)
Mortgage-backed securities - Federal agencies454,413 (7,312)35,232 (1,147)489,645 (8,459)
Corporate debt securities      
Foreign government securities598 (2)  598 (2)
Total debt securities available-for-sale$1,284,132 $(19,022)$124,298 $(3,586)$1,408,430 $(22,608)
December 31, 2020      
U.S. Treasury and Federal agencies securities$136,534 $(234)$— $— $136,534 $(234)
U.S. States and political subdivisions securities6,391 (30)199 (1)6,590 (31)
Mortgage-backed securities - Federal agencies67,736 (187)3,274 (9)71,010 (196)
Corporate debt securities— — — — — — 
Foreign government securities200 — — — 200 — 
Total debt securities available-for-sale$210,861 $(451)$3,473 $(10)$214,334 $(461)
Schedule of gross realized gains and losses from securities available-for-sale portfolio
The following table shows the gross realized gains and losses from the available-for-sale debt securities portfolio. Realized gains and losses of all securities are computed using the specific identification cost basis.
(Dollars in thousands)202120202019
Gross realized gains$221 $285 $— 
Gross realized losses(901)(6)— 
Net realized (losses) gains$(680)$279 $—