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Investment Securities - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months $ 70,814 $ 62,124
Greater than or equal to 12 continuous months 722,027 738,690
Total securities in a loss position 792,841 800,814
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (1,518) (676)
Greater than or equal to 12 continuous months (117,645) (109,767)
Held-to-maturity, gross unrealized losses (119,163) (110,443)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 1,518 1,901
Available-for-sale, greater than 12 continuous months, fair value 534,613 549,289
Available-for-sale, total securities in a loss position, fair value 536,131 551,190
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss (6) (8)
Available-for-sale, greater than 12 continuous months, unrealized loss (66,015) (61,446)
Available-for-sale, total securities in a loss position, unrealized loss (66,021) (61,454)
Marketable Securities, Fair Value    
Marketable securities, less than 12 continuous months, fair value 72,332 64,025
Marketable securities, greater than 12 continuous months, fair value 1,256,640 1,287,979
Marketable securities, total securities in a loss position, fair value 1,328,972 1,352,004
Marketable Securities, Continuous Unrealized Loss    
Marketable securities, less than 12 continuous months, unrealized loss (1,524) (684)
Marketable securities, greater than 12 continuous months, unrealized loss (183,660) (171,213)
Marketable securities, total securities in a loss position, unrealized loss (185,184) (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 252,501 261,865
Total securities in a loss position 252,501 261,865
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (48,474) (44,396)
Held-to-maturity, gross unrealized losses (48,474) (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 69,152 72,146
Available-for-sale, total securities in a loss position, fair value 69,155 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 (10,073) (9,516)
Available-for-sale, total securities in a loss position, unrealized loss (10,073) (9,516)
CMOs issued by FHLMC    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 12,455 8,662
Greater than or equal to 12 continuous months 185,319 188,657
Total securities in a loss position 197,774 197,319
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (68) (21)
Greater than or equal to 12 continuous months (26,834) (24,848)
Held-to-maturity, gross unrealized losses (26,902) (24,869)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 958 1,235
Available-for-sale, greater than 12 continuous months, fair value 234,002 240,414
Available-for-sale, total securities in a loss position, fair value 234,960 241,649
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss (4) (7)
Available-for-sale, greater than 12 continuous months, unrealized loss (26,833) (24,751)
Available-for-sale, total securities in a loss position, unrealized loss (26,837) (24,758)
CMOs issued by FNMA    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 40,962 42,474
Greater than or equal to 12 continuous months 51,980 54,249
Total securities in a loss position 92,942 96,723
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (1,054) (411)
Greater than or equal to 12 continuous months (4,955) (4,368)
Held-to-maturity, gross unrealized losses (6,009) (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 20,264 21,272
Available-for-sale, total securities in a loss position, fair value 20,264 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 (2,835) (2,715)
Available-for-sale, total securities in a loss position, unrealized loss (2,835) (2,715)
CMOs issued by GNMA    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 10,808 10,988
Greater than or equal to 12 continuous months 34,452 34,783
Total securities in a loss position 45,260 45,771
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (350) (244)
Greater than or equal to 12 continuous months (5,086) (4,991)
Held-to-maturity, gross unrealized losses (5,436) (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 16,295 17,128
Available-for-sale, total securities in a loss position, fair value 16,295 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 (3,191) (2,878)
Available-for-sale, total securities in a loss position, unrealized loss (3,191) (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 1,556 1,763
Total securities in a loss position 1,556 1,763
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (95) (90)
Held-to-maturity, gross unrealized losses (95) (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 17,148 19,471
Available-for-sale, total securities in a loss position, fair value 17,148 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 (1,657) (1,655)
Available-for-sale, total securities in a loss position, unrealized loss (1,657) (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 123,260 124,132
Total securities in a loss position 123,260 124,132
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (22,942) (21,994)
Held-to-maturity, gross unrealized losses (22,942) (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 66,688 66,862
Available-for-sale, total securities in a loss position, fair value 66,688 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 (7,218) (7,037)
Available-for-sale, total securities in a loss position, unrealized loss (7,218) (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 10,534 10,623
Available-for-sale, total securities in a loss position, fair value 10,534 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 (1,394) (1,300)
Available-for-sale, total securities in a loss position, unrealized loss (1,394) (1,300)
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Fair Value    
Less than 12 continuous months 6,589 0
Greater than or equal to 12 continuous months 44,242 44,437
Total securities in a loss position 50,831 44,437
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months (46) 0
Greater than or equal to 12 continuous months (7,976) (7,884)
Held-to-maturity, gross unrealized losses (8,022) (7,884)
Debt Securities, Available-For-Sale, Fair Value    
Available-for-sale, less than 12 continuous months, fair value 557 666
Available-for-sale, greater than 12 continuous months, fair value 89,786 90,655
Available-for-sale, total securities in a loss position, fair value 90,343 91,321
Debt Securities, Available-for-sale, Unrealized Loss    
Available-for-sale, less than 12 continuous months, unrealized loss (2) (1)
Available-for-sale, greater than 12 continuous months, unrealized loss (11,566) (10,320)
Available-for-sale, total securities in a loss position, unrealized loss (11,568) (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 28,717 28,804
Total securities in a loss position 28,717 28,804
Debt Securities, Held-to-maturity, Unrealized Loss    
Less than 12 continuous months 0 0
Greater than or equal to 12 continuous months (1,283) (1,196)
Held-to-maturity, gross unrealized losses (1,283) (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 10,744 10,718
Available-for-sale, total securities in a loss position, fair value 10,744 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 (1,248) (1,274)
Available-for-sale, total securities in a loss position, unrealized loss $ (1,248) $ (1,274)