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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
Security
Dec. 31, 2023
USD ($)
Security
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 60 56
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 613,117 $ 146,416
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (3,268) $ (3,240)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 620 671
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 1,840,523 $ 2,145,336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (318,367) (298,236)
Debt Securities, Available-for-sale, Unrealized Loss Position 2,453,640 2,291,752
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (321,635) $ (301,476)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 0 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 180 180
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 1,033,439 $ 1,072,207
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (210,994) (195,715)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 1,033,439 1,072,207
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (210,994) $ (195,715)
US Government Debt Securities    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months   $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security   1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer   $ 42,161
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (314)
Debt Securities, Available-for-sale, Unrealized Loss Position   42,161
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss   $ (314)
US Government Agencies Debt Securities    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months   $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security   1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer   $ 1,010
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   (28)
Debt Securities, Available-for-sale, Unrealized Loss Position   1,010
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss   $ (28)
State and Municipal Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 19 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 48,682 $ 76,155
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (1,552) $ (858)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 276 314
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 766,484 $ 917,274
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (143,781) (128,789)
Debt Securities, Available-for-sale, Unrealized Loss Position 815,166 993,429
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (145,333) $ (129,647)
Corporate Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 0 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 0 $ 42,945
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ (1,326)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 52 60
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 286,277 $ 370,523
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (32,013) (39,310)
Debt Securities, Available-for-sale, Unrealized Loss Position 286,277 413,468
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (32,013) $ (40,636)
Collateralized Mortgage Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 9 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 195,411 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (601) $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 82 93
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 93,219 $ 111,434
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (11,765) (11,390)
Debt Securities, Available-for-sale, Unrealized Loss Position 288,630 111,434
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (12,366) $ (11,390)
Residential Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 32 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 369,024 $ 409
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ (1,115) $ (3)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 75 69
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 183,416 $ 195,453
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (30,975) (26,482)
Debt Securities, Available-for-sale, Unrealized Loss Position 552,440 195,862
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (32,090) $ (26,485)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 0 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 120 120
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 326,363 $ 355,270
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (58,593) (51,805)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 326,363 355,270
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (58,593) $ (51,805)
Commercial Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 0 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 0 $ 26,907
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ (1,053)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 135 133
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 511,127 $ 507,481
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (99,833) (91,923)
Debt Securities, Available-for-sale, Unrealized Loss Position 511,127 534,388
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (99,833) $ (92,976)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security 0 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 0 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security 60 60
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value $ 707,076 $ 716,937
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer (152,401) (143,910)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value 707,076 716,937
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss $ (152,401) $ (143,910)