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Investments (Unrealized Gross Losses and Estimated Fair values of Investment Securities by Length of Time that Individual Securities in Each Category in Continuous Loss Position) (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security 204 205
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 74,749 $ 35,439
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 500 74
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 427,491 488,825
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 79,609 78,848
Debt Securities, Available-for-sale, Unrealized Loss Position 502,240 524,264
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 80,109 $ 78,922
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security 11 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 1,377 $ 2,345
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,597 1,437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 127 38
Debt Securities, Available-for-sale, Unrealized Loss Position 4,974 3,782
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 134 $ 44
MBS issued or guaranteed by U.S. government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security 136 145
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 36,732 $ 13,474
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 260 23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 352,823 407,200
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 68,903 65,955
Debt Securities, Available-for-sale, Unrealized Loss Position 389,555 420,674
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 69,163 $ 65,978
CMO issued or guaranteed by U.S. government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security 47 43
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 36,146 $ 19,620
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 227 45
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 55,540 62,869
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 8,927 9,492
Debt Securities, Available-for-sale, Unrealized Loss Position 91,686 82,489
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 9,154 $ 9,537
Subordinated corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security 10 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 494 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 6 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 15,531 17,319
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,652 3,363
Debt Securities, Available-for-sale, Unrealized Loss Position 16,025 17,319
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 1,658 $ 3,363