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Investment Securities (Details 2) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Schedule Of Available For Sale Debt Securities [Line Items] |  |  |  |  |
Amortized cost of Investment Securities available-for-sale | $ 1,555,564 |  | $ 1,555,564 |  | $ 1,650,684
Gross Unrealized Gains | 6,284 |  | 6,284 |  | 249
Gross Unrealized Losses | (66,731) |  | (66,731) |  | (114,634)
Investment securities available-for-sale | 1,495,117 |  | 1,495,117 |  | 1,536,299
Fair Value |  |  |  |  |
Less than 12 Months | 154,330 |  | 154,330 |  | 332,417
12 months or Longer | 897,436 |  | 897,436 |  | 1,150,098
Total fair value | 1,051,766 |  | 1,051,766 |  | 1,482,515
Unrealized Losses |  |  |  |  |
Less than 12 Months | (792) |  | (792) |  | (5,349)
12 months or Longer | (65,939) |  | (65,939) |  | (109,285)
Total unrealized losses | (66,731) |  | (66,731) |  | (114,634)
Proceeds from sales and gross realized gains and losses |  |  |  |  |
Proceeds from sales | 73,537 | $ 0 | 99,246 | $ 0 |
Gross realized gains | 0 | 0 | 0 | 0 |
Gross realized losses | 1,877 | $ 0 | 2,874 | $ 0 |
Investment securities pledged as collateral | $ 246,180 |  | $ 246,180 |  | 359,100
Number of available-for-sale debt securities | 632 |  | 632 |  |
Number of available-for-sale debt securities in an unrealized loss position | 467 |  | 467 |  |
U.S. Treasury and Federal agencies securities |  |  |  |  |
Schedule Of Available For Sale Debt Securities [Line Items] |  |  |  |  |
Amortized cost of Investment Securities available-for-sale | $ 706,387 |  | $ 706,387 |  | 786,417
Gross Unrealized Gains | 2,644 |  | 2,644 |  | 24
Gross Unrealized Losses | (9,174) |  | (9,174) |  | (28,692)
Investment securities available-for-sale | 699,857 |  | 699,857 |  | 757,749
Fair Value |  |  |  |  |
Less than 12 Months | 108,618 |  | 108,618 |  | 103,621
12 months or Longer | 392,971 |  | 392,971 |  | 644,614
Total fair value | 501,589 |  | 501,589 |  | 748,235
Unrealized Losses |  |  |  |  |
Less than 12 Months | (500) |  | (500) |  | (1,324)
12 months or Longer | (8,674) |  | (8,674) |  | (27,368)
Total unrealized losses | (9,174) |  | (9,174) |  | (28,692)
U.S. States and political subdivisions securities |  |  |  |  |
Schedule Of Available For Sale Debt Securities [Line Items] |  |  |  |  |
Amortized cost of Investment Securities available-for-sale | 106,537 |  | 106,537 |  | 86,305
Gross Unrealized Gains | 1,048 |  | 1,048 |  | 33
Gross Unrealized Losses | (1,905) |  | (1,905) |  | (3,706)
Investment securities available-for-sale | 105,680 |  | 105,680 |  | 82,632
Fair Value |  |  |  |  |
Less than 12 Months | 12,156 |  | 12,156 |  | 37,017
12 months or Longer | 33,728 |  | 33,728 |  | 39,280
Total fair value | 45,884 |  | 45,884 |  | 76,297
Unrealized Losses |  |  |  |  |
Less than 12 Months | (121) |  | (121) |  | (670)
12 months or Longer | (1,784) |  | (1,784) |  | (3,036)
Total unrealized losses | (1,905) |  | (1,905) |  | (3,706)
Mortgage-backed securities - Federal agencies |  |  |  |  |
Schedule Of Available For Sale Debt Securities [Line Items] |  |  |  |  |
Amortized cost of Investment Securities available-for-sale | 742,140 |  | 742,140 |  | 777,962
Gross Unrealized Gains | 2,590 |  | 2,590 |  | 192
Gross Unrealized Losses | (55,652) |  | (55,652) |  | (82,236)
Investment securities available-for-sale | 689,078 |  | 689,078 |  | 695,918
Fair Value |  |  |  |  |
Less than 12 Months | 33,556 |  | 33,556 |  | 191,779
12 months or Longer | 470,737 |  | 470,737 |  | 466,204
Total fair value | 504,293 |  | 504,293 |  | 657,983
Unrealized Losses |  |  |  |  |
Less than 12 Months | (171) |  | (171) |  | (3,355)
12 months or Longer | (55,481) |  | (55,481) |  | (78,881)
Total unrealized losses | (55,652) |  | (55,652) |  | $ (82,236)
Corporate debt securities |  |  |  |  |
Schedule Of Available For Sale Debt Securities [Line Items] |  |  |  |  |
Amortized cost of Investment Securities available-for-sale | 500 |  | 500 |  |
Gross Unrealized Gains | 2 |  | 2 |  |
Gross Unrealized Losses | 0 |  | 0 |  |
Investment securities available-for-sale | $ 502 |  | $ 502 |  |

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