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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, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 180 | 30
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 871,583 | $ 107,635
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14,074 | 916
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 101,074 | 980
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,656 | 6
Debt Securities, Available-for-sale, Unrealized Loss Position | 972,657 | 108,615
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 17,730 | $ 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 | 0 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 0 | $ 2,404
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 115
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 | 0 | 2,404
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 0 | $ 115
Mortgage-backed securities 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 | 113 | 15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 659,851 | $ 61,222
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8,999 | 568
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 61,978 | 980
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,469 | 6
Debt Securities, Available-for-sale, Unrealized Loss Position | 721,829 | 62,202
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 11,468 | $ 574
Collateralized mortgage obligations 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 | 56 | 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 191,456 | $ 39,107
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4,602 | 135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 38,117 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,165 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 229,573 | 39,107
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 5,767 | $ 135
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 7 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 11,932 | $ 4,902
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 232 | 98
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 979 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 22 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 12,911 | 4,902
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 254 | $ 98
US Government-sponsored Enterprises Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security | 4 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 8,344 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 241 |
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 | 8,344 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 241 |

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