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Securities - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 4 4
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 63,800 $ 65,755
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss (9,746) (8,255)
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 63,800 65,755
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (9,746) $ (8,255)
Securities have been in a continuous unrealized loss position, number of positions 164 166
Securities have been in a continuous unrealized loss position, fair value $ 759,398 $ 702,778
Securities have been in a continuous unrealized loss position, unrealized losses (86,733) (83,020)
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 205,408 33,856
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses (440) (1,360)
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 553,990 668,922
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (86,293) $ (81,660)
Total Other Securities [Member]    
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 3 3
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 56,856 $ 58,697
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss (8,840) (7,458)
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 56,856 58,697
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (8,840) $ (7,458)
Securities have been in a continuous unrealized loss position, number of positions 46 51
Securities have been in a continuous unrealized loss position, fair value $ 323,078 $ 350,575
Securities have been in a continuous unrealized loss position, unrealized losses (18,544) (19,358)
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 105,125 27,945
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses (285) (1,325)
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 217,953 322,630
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (18,259) $ (18,033)
US States and Political Subdivisions Debt Securities [Member]    
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 3 3
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 56,856 $ 58,697
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss (8,840) (7,458)
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 56,856 58,697
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (8,840) $ (7,458)
US Government Agencies Debt Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 5 8
Securities have been in a continuous unrealized loss position, fair value $ 24,308 $ 74,517
Securities have been in a continuous unrealized loss position, unrealized losses (629) (937)
Securities have been in a continuous unrealized loss position, less than 12 months, fair value   2,517
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses   (7)
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 24,308 72,000
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (629) $ (930)
Corporate Debt Securities [Member]    
Securities have been in a continuous unrealized loss position, number of positions 23 26
Securities have been in a continuous unrealized loss position, fair value $ 144,206 $ 155,449
Securities have been in a continuous unrealized loss position, unrealized losses (17,569) (17,735)
Securities have been in a continuous unrealized loss position, less than 12 months, fair value   25,428
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses   (1,318)
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 144,206 130,021
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (17,569) $ (16,417)
Collateralized Debt Obligations [Member]    
Securities have been in a continuous unrealized loss position, number of positions 18 17
Securities have been in a continuous unrealized loss position, fair value $ 154,564 $ 120,609
Securities have been in a continuous unrealized loss position, unrealized losses (346) (686)
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 105,125  
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses (285)  
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 49,439 120,609
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (61) $ (686)
Collateralized Mortgage Backed Securities    
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 1 1
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 6,944 $ 7,058
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss (906) (797)
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 6,944 7,058
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (906) $ (797)
Securities have been in a continuous unrealized loss position, number of positions 118 115
Securities have been in a continuous unrealized loss position, fair value $ 436,320 $ 352,203
Securities have been in a continuous unrealized loss position, unrealized losses (68,189) (63,662)
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 100,283 5,911
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses (155) (35)
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 336,037 346,292
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (68,034) $ (63,627)
REMIC and CMO [Member]    
Securities have been in a continuous unrealized loss position, number of positions 50 46
Securities have been in a continuous unrealized loss position, fair value $ 212,565 $ 133,312
Securities have been in a continuous unrealized loss position, unrealized losses (27,465) (26,591)
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 83,511  
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses (120)  
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 129,054 133,312
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (27,345) $ (26,591)
GNMA [Member]    
Securities have been in a continuous unrealized loss position, number of positions 7 7
Securities have been in a continuous unrealized loss position, fair value $ 23,079 $ 10,466
Securities have been in a continuous unrealized loss position, unrealized losses (1,907) (1,740)
Securities have been in a continuous unrealized loss position, less than 12 months, fair value 16,772 3,867
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses (35) (34)
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 6,307 6,599
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (1,872) $ (1,706)
FNMA [Member]    
Held-to-maturity securities have been in a continuous unrealized loss position, number of positions 1 1
Held-to-maturity securities have been in a continuous unrealized loss position, fair value $ 6,944 $ 7,058
Held-to-maturity securities have been in a continuous unrealized loss position, unrealized loss (906) (797)
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, fair value 6,944 7,058
Held-to-maturity securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (906) $ (797)
Securities have been in a continuous unrealized loss position, number of positions 43 44
Securities have been in a continuous unrealized loss position, fair value $ 128,678 $ 133,394
Securities have been in a continuous unrealized loss position, unrealized losses (22,981) (20,935)
Securities have been in a continuous unrealized loss position, less than 12 months, fair value   2,044
Securities have been in a continuous unrealized loss position, less than 12 months, unrealized losses   (1)
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 128,678 131,350
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (22,981) $ (20,934)
FHLMC [Member]    
Securities have been in a continuous unrealized loss position, number of positions 18 18
Securities have been in a continuous unrealized loss position, fair value $ 71,998 $ 75,031
Securities have been in a continuous unrealized loss position, unrealized losses (15,836) (14,396)
Securities have been in a continuous unrealized loss position, 12 months or more, fair value 71,998 75,031
Securities have been in a continuous unrealized loss position, 12 months or more, unrealized losses $ (15,836) $ (14,396)