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Securities Securities (Available for sale securities in continuous unrealized loss position) (Details) $ in Thousands | Mar. 31, 2022 USD ($) holding | Dec. 31, 2021 USD ($) 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 | 117 | 37
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,350,989 | $ 1,210,544
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (82,115) | (21,197)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 112,467 | 1,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (12,901) | (199)
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,463,456 | 1,211,544
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 95,016 | $ 21,396
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 | 73 | 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 242,172 | $ 214,678
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (13,870) | (5,534)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 88,670 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (10,566) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 330,842 | 214,678
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 24,436 | $ 5,534
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 | 10 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 45,455 | $ 22,960
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (796) | (571)
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 | 45,455 | 22,960
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 796 | $ 571
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 | 999 | 1,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (200) | (199)
Debt Securities, Available-for-sale, Unrealized Loss Position | 999 | 1,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 200 | $ 199
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 | 7 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 60,416 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2,715) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | 60,416 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2,715 |
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 | 8 | 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 180,613 | $ 160,913
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (13,459) | (2,901)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 22,798 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,135) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 203,411 | 160,913
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 15,594 | $ 2,901
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 | 17
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 822,333 | $ 811,993
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (51,275) | (12,191)
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 | 822,333 | 811,993
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 51,275 | $ 12,191

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