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Investment Securities - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months $ 47,802 $ 62,124
Greater than or equal to 12 continuous months 735,595 738,690
Total securities in a loss position 783,397 800,814
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (1,299) (676)
Greater than or equal to 12 continuous months (119,914) (109,767)
Held-to-maturity, gross unrealized losses (121,213) (110,443)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 953 1,901
Available-for-sale, greater than 12 continuous months, fair value 232,736 549,289
Available-for-sale, total securities in a loss position, fair value 233,689 551,190
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss (5) (8)
Available-for-sale, greater than 12 continuous months, unrealized loss (32,929) (61,446)
Available-for-sale, total securities in a loss position, unrealized loss (32,934) (61,454)
Marketable Securities, Fair Value    
Marketable securities, less than 12 continuous months, fair value 48,755 64,025
Marketable securities, greater than 12 continuous months, fair value 968,331 1,287,979
Marketable securities, total securities in a loss position, fair value 1,017,086 1,352,004
Marketable Securities, Continuous Unrealized Loss    
Marketable securities, less than 12 continuous months, unrealized loss (1,304) (684)
Marketable securities, greater than 12 continuous months, unrealized loss (152,843) (171,213)
Marketable securities, total securities in a loss position, unrealized loss (154,147) (171,897)
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 246,943 261,865
Total securities in a loss position 246,943 261,865
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (48,998) (44,396)
Held-to-maturity, gross unrealized losses (48,998) (44,396)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 3 0
Available-for-sale, greater than 12 continuous months, fair value 31,268 72,146
Available-for-sale, total securities in a loss position, fair value 31,271 72,146
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 (5,584) (9,516)
Available-for-sale, total securities in a loss position, unrealized loss (5,584) (9,516)
CMOs issued by FHLMC    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 11,881 8,662
Greater than or equal to 12 continuous months 183,398 188,657
Total securities in a loss position 195,279 197,319
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (196) (21)
Greater than or equal to 12 continuous months (27,144) (24,848)
Held-to-maturity, gross unrealized losses (27,340) (24,869)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 950 1,235
Available-for-sale, greater than 12 continuous months, fair value 78,117 240,414
Available-for-sale, total securities in a loss position, fair value 79,067 241,649
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss (5) (7)
Available-for-sale, greater than 12 continuous months, unrealized loss (8,546) (24,751)
Available-for-sale, total securities in a loss position, unrealized loss (8,551) (24,758)
CMOs issued by FNMA    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 15,552 42,474
Greater than or equal to 12 continuous months 74,028 54,249
Total securities in a loss position 89,580 96,723
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (669) (411)
Greater than or equal to 12 continuous months (5,638) (4,368)
Held-to-maturity, gross unrealized losses (6,307) (4,779)
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 3,866 21,272
Available-for-sale, total securities in a loss position, fair value 3,866 21,272
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 (654) (2,715)
Available-for-sale, total securities in a loss position, unrealized loss (654) (2,715)
CMOs issued by GNMA    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 10,755 10,988
Greater than or equal to 12 continuous months 34,003 34,783
Total securities in a loss position 44,758 45,771
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (363) (244)
Greater than or equal to 12 continuous months (5,317) (4,991)
Held-to-maturity, gross unrealized losses (5,680) (5,235)
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 11,544 17,128
Available-for-sale, total securities in a loss position, fair value 11,544 17,128
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 (2,756) (2,878)
Available-for-sale, total securities in a loss position, unrealized loss (2,756) (2,878)
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 1,560 1,763
Total securities in a loss position 1,560 1,763
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (91) (90)
Held-to-maturity, gross unrealized losses (91) (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 335 19,471
Available-for-sale, total securities in a loss position, fair value 335 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 (31) (1,655)
Available-for-sale, total securities in a loss position, unrealized loss (31) (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 123,067 124,132
Total securities in a loss position 123,067 124,132
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (23,209) (21,994)
Held-to-maturity, gross unrealized losses (23,209) (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 7,133 66,862
Available-for-sale, total securities in a loss position, fair value 7,133 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 (1,837) (7,037)
Available-for-sale, total securities in a loss position, unrealized loss (1,837) (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 10,570 10,623
Available-for-sale, total securities in a loss position, fair value 10,570 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 (1,362) (1,300)
Available-for-sale, total securities in a loss position, unrealized loss (1,362) (1,300)
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 9,614 0
Greater than or equal to 12 continuous months 43,793 44,437
Total securities in a loss position 53,407 44,437
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (71) 0
Greater than or equal to 12 continuous months (8,320) (7,884)
Held-to-maturity, gross unrealized losses (8,391) (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 84,481 90,655
Available-for-sale, total securities in a loss position, fair value 84,481 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 (11,581) (10,320)
Available-for-sale, total securities in a loss position, unrealized loss (11,581) (10,321)
Corporate bonds    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months 28,803 28,804
Total securities in a loss position 28,803 28,804
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (1,197) (1,196)
Held-to-maturity, gross unrealized losses (1,197) (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 5,422 10,718
Available-for-sale, total securities in a loss position, fair value 5,422 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 (578) (1,274)
Available-for-sale, total securities in a loss position, unrealized loss $ (578) $ (1,274)