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Securities Securities (Available for sale securities in continuous unrealized loss position) (Details) $ in Thousands | Jun. 30, 2023 USD ($) holding | Dec. 31, 2022 USD ($) holding
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding | 185 | 173
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 17,144 | $ 333,099
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (783) | (35,411)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,354,317 | 1,062,964
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (159,673) | (132,268)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,371,461 | 1,396,063
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 160,456 | $ 167,679
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding | 135 | 123
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 10,660 | $ 155,944
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (464) | (15,186)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 275,316 | 154,653
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (44,227) | (30,248)
Debt Securities, Available-for-sale, Unrealized Loss Position | 285,976 | 310,597
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 44,691 | $ 45,434
Collateralized Debt Obligations [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding | 13 | 13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 2,701 | $ 38,843
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (41) | (3,031)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 33,085 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,075) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 35,786 | 38,843
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 3,116 | $ 3,031
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding | 1 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 190 | $ 191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (4) | (2)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 190 | 191
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 4 | $ 2
Pooled trust preferred securities issued by banks and insurers |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding | 1 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,025 | 1,034
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (180) | (169)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,025 | 1,034
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 180 | $ 169
Small Business Administration Pooled Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding | 8 | 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 3,593 | $ 34,511
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (274) | (3,550)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 44,539 | 17,246
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (7,654) | (4,163)
Debt Securities, Available-for-sale, Unrealized Loss Position | 48,132 | 51,757
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 7,928 | $ 7,713
U.S. government agency securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding | 9 | 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 | $ 60,575
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (7,292)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 202,491 | 141,725
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (28,079) | (21,344)
Debt Securities, Available-for-sale, Unrealized Loss Position | 202,491 | 202,300
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 28,079 | $ 28,636
US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | holding | 18 | 18
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 | $ 43,035
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (6,350)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 797,861 | 748,306
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (76,458) | (76,344)
Debt Securities, Available-for-sale, Unrealized Loss Position | 797,861 | 791,341
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 76,458 | $ 82,694

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