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Securities Securities (Available for sale securities in continuous unrealized loss position) (Details) $ in Thousands | Mar. 31, 2024 USD ($) holding | Dec. 31, 2023 USD ($) 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 | 172 | 163
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 2,123 | $ 1,620
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (23) | (18)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,268,945 | 1,328,959
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (129,560) | (125,618)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,271,068 | 1,330,579
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 129,583 | $ 125,636
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 | 125 | 115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 857 | $ 1,091
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (8) | (11)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 267,985 | 273,447
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (38,972) | (37,235)
Debt Securities, Available-for-sale, Unrealized Loss Position | 268,842 | 274,538
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 38,980 | $ 37,246
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 | 12 | 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,075 | $ 339
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (11) | (2)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 31,013 | 31,682
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,545) | (2,528)
Debt Securities, Available-for-sale, Unrealized Loss Position | 32,088 | 32,021
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2,556 | $ 2,530
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 | $ 191 | $ 190
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (4) | (5)
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 | 191 | 190
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 4 | $ 5
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 | 1,036 | 1,018
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (144) | (170)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,036 | 1,018
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 144 | $ 170
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 | $ 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 | 44,397 | 46,572
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (7,686) | (7,130)
Debt Securities, Available-for-sale, Unrealized Loss Position | 44,397 | 46,572
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 7,686 | $ 7,130
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 | $ 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 | 205,676 | 207,138
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (24,337) | (23,060)
Debt Securities, Available-for-sale, Unrealized Loss Position | 205,676 | 207,138
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 24,337 | $ 23,060
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 | 16 | 17
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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 718,838 | 769,102
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (55,876) | (55,495)
Debt Securities, Available-for-sale, Unrealized Loss Position | 718,838 | 769,102
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 55,876 | $ 55,495

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