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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, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Number of Holdings, AFS Investments in Unrealized Loss Positions | security | 105 | 300
AFS Fair Value - Less Than 12 Months Loss Position | $ 259,972 | $ 100,011
AFS Unrealized Losses - Less Than 12 Months Loss Position | (2,911) | (599)
AFS Fair Value - 12 Months or More Loss Position | 132,247 | 621,294
AFS Unrealized Losses - 12 Months or More Loss Position | (2,500) | (23,937)
AFS Fair Value - Loss Position | 392,219 | 721,305
AFS Unrealized Losses | $ (5,411) | $ (24,536)
Number of Holdings, HTM Investments in Unrealized Loss Positions | security |  | 2
HTM Fair Value - Less Than 12 Months Loss Position |  | $ 509
HTM Unrealized Losses - Less Than 12 Months Loss Position |  | (5)
HTM Fair Value - 12 Months or More Loss Position |  | 411
HTM Fair Value - 12 Months or More Loss Position |  | (19)
HTM Fair Value - Loss Position |  | 920
HTM Unrealized Losses |  | $ (24)
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Holdings, AFS Investments in Unrealized Loss Positions | security | 11 | 114
AFS Fair Value - Less Than 12 Months Loss Position | $ 30,459 | $ 36,218
AFS Unrealized Losses - Less Than 12 Months Loss Position | (328) | (281)
AFS Fair Value - 12 Months or More Loss Position | 0 | 28,437
AFS Unrealized Losses - 12 Months or More Loss Position | 0 | (613)
AFS Fair Value - Loss Position | 30,459 | 64,655
AFS Unrealized Losses | $ (328) | $ (894)
Number of Holdings, HTM Investments in Unrealized Loss Positions | security |  | 2
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Holdings, AFS Investments in Unrealized Loss Positions | security | 59 | 117
AFS Fair Value - Less Than 12 Months Loss Position | $ 162,964 | $ 46,459
AFS Unrealized Losses - Less Than 12 Months Loss Position | (1,850) | (252)
AFS Fair Value - 12 Months or More Loss Position | 63,633 | 364,430
AFS Unrealized Losses - 12 Months or More Loss Position | (755) | (13,272)
AFS Fair Value - Loss Position | 226,597 | 410,889
AFS Unrealized Losses | $ (2,605) | $ (13,524)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Holdings, AFS Investments in Unrealized Loss Positions | security | 35 | 63
AFS Fair Value - Less Than 12 Months Loss Position | $ 66,549 | $ 5,956
AFS Unrealized Losses - Less Than 12 Months Loss Position | (733) | (40)
AFS Fair Value - 12 Months or More Loss Position | 68,614 | 227,461
AFS Unrealized Losses - 12 Months or More Loss Position | (1,745) | (10,031)
AFS Fair Value - Loss Position | 135,163 | 233,417
AFS Unrealized Losses | $ (2,478) | (10,071)
HTM Fair Value - Less Than 12 Months Loss Position |  | 509
HTM Unrealized Losses - Less Than 12 Months Loss Position |  | (5)
HTM Fair Value - 12 Months or More Loss Position |  | 411
HTM Fair Value - 12 Months or More Loss Position |  | (19)
HTM Fair Value - Loss Position |  | 920
HTM Unrealized Losses |  | $ (24)
Subordinated corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of Holdings, AFS Investments in Unrealized Loss Positions | security |  | 6
AFS Fair Value - Less Than 12 Months Loss Position |  | $ 11,378
AFS Unrealized Losses - Less Than 12 Months Loss Position |  | (26)
AFS Fair Value - 12 Months or More Loss Position |  | 966
AFS Unrealized Losses - 12 Months or More Loss Position |  | (21)
AFS Fair Value - Loss Position |  | 12,344
AFS Unrealized Losses |  | $ (47)

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