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Investment Securities - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months $ 20,764 $ 62,124
Greater than or equal to 12 continuous months 757,652 738,690
Total securities in a loss position 778,416 800,814
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (1,240) (676)
Greater than or equal to 12 continuous months (88,167) (109,767)
Held-to-maturity, gross unrealized losses (89,407) (110,443)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 76,278 1,901
Available-for-sale, greater than 12 continuous months, fair value 234,867 549,289
Available-for-sale, total securities in a loss position, fair value 311,145 551,190
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss (92) (8)
Available-for-sale, greater than 12 continuous months, unrealized loss (25,213) (61,446)
Available-for-sale, total securities in a loss position, unrealized loss (25,305) (61,454)
Marketable Securities, Fair Value    
Marketable securities, less than 12 continuous months, fair value 97,042 64,025
Marketable securities, greater than 12 continuous months, fair value 992,519 1,287,979
Marketable securities, total securities in a loss position, fair value 1,089,561 1,352,004
Marketable Securities, Continuous Unrealized Loss    
Marketable securities, less than 12 continuous months, unrealized loss (1,332) (684)
Marketable securities, greater than 12 continuous months, unrealized loss (113,380) (171,213)
Marketable securities, total securities in a loss position, unrealized loss (114,712) (171,897)
CMBS issued by FHLMC, FNMA and GNMA    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 8,888 10,988
Greater than or equal to 12 continuous months 206,503 201,383
Total securities in a loss position 215,391 212,371
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (35) (244)
Greater than or equal to 12 continuous months (28,196) (34,826)
Held-to-maturity, gross unrealized losses (28,231) (35,070)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 76,278 1,235
Available-for-sale, greater than 12 continuous months, fair value 60,550 146,454
Available-for-sale, total securities in a loss position, fair value 136,828 147,689
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss (92) (7)
Available-for-sale, greater than 12 continuous months, unrealized loss (3,850) (13,272)
Available-for-sale, total securities in a loss position, unrealized loss (3,942) (13,279)
CMOs issued by FHLMC, FNMA and GNMA    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 7,819 51,136
Greater than or equal to 12 continuous months 182,278 156,515
Total securities in a loss position 190,097 207,651
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (1,204) (432)
Greater than or equal to 12 continuous months (11,528) (16,451)
Held-to-maturity, gross unrealized losses (12,732) (16,883)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 36,052 136,269
Available-for-sale, total securities in a loss position, fair value 36,052 136,269
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss (5,248) (17,420)
Available-for-sale, total securities in a loss position, unrealized loss (5,248) (17,420)
MBS pass-through securities issued by FHLMC, FNMA and GNMA    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months 169,133 181,656
Total securities in a loss position 169,133 181,656
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (23,301) (27,326)
Held-to-maturity, gross unrealized losses (23,301) (27,326)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 27,535 68,237
Available-for-sale, total securities in a loss position, fair value 27,535 68,237
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss (3,823) (9,168)
Available-for-sale, total securities in a loss position, unrealized loss (3,823) (9,168)
SBA-backed securities    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months 1,471 1,763
Total securities in a loss position 1,471 1,763
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (43) (90)
Held-to-maturity, gross unrealized losses (43) (90)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 314 19,471
Available-for-sale, total securities in a loss position, fair value 314 19,471
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss (18) (1,655)
Available-for-sale, total securities in a loss position, unrealized loss (18) (1,655)
Debentures of government- sponsored agencies    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months 123,582 124,132
Total securities in a loss position 123,582 124,132
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (17,775) (21,994)
Held-to-maturity, gross unrealized losses (17,775) (21,994)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 7,508 66,862
Available-for-sale, total securities in a loss position, fair value 7,508 66,862
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss (1,463) (7,037)
Available-for-sale, total securities in a loss position, unrealized loss (1,463) (7,037)
U.S. Treasury securities    
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 10,975 10,623
Available-for-sale, total securities in a loss position, fair value 10,975 10,623
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss (962) (1,300)
Available-for-sale, total securities in a loss position, unrealized loss (962) (1,300)
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 4,057 0
Greater than or equal to 12 continuous months 45,312 44,437
Total securities in a loss position 49,369 44,437
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (1) 0
Greater than or equal to 12 continuous months (6,697) (7,884)
Held-to-maturity, gross unrealized losses (6,698) (7,884)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 666
Available-for-sale, greater than 12 continuous months, fair value 86,355 90,655
Available-for-sale, total securities in a loss position, fair value 86,355 91,321
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 (1)
Available-for-sale, greater than 12 continuous months, unrealized loss (9,427) (10,320)
Available-for-sale, total securities in a loss position, unrealized loss (9,427) (10,321)
Corporate bonds    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 0
Greater than or equal to 12 continuous months 29,373 28,804
Total securities in a loss position 29,373 28,804
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0
Greater than or equal to 12 continuous months (627) (1,196)
Held-to-maturity, gross unrealized losses (627) (1,196)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 0 0
Available-for-sale, greater than 12 continuous months, fair value 5,578 10,718
Available-for-sale, total securities in a loss position, fair value 5,578 10,718
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss 0 0
Available-for-sale, greater than 12 continuous months, unrealized loss (422) (1,274)
Available-for-sale, total securities in a loss position, unrealized loss $ (422) $ (1,274)