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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 152,859 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (2,845) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 240,871 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (10,271) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 393,730 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (13,116) |
Less than 12 months, Fair Value |  | $ 148,611
Less than 12 months, Unrealized Losses |  | (2,100)
12 months or more, Fair Value |  | 144,394
12 months or more, Unrealized Losses |  | (3,843)
Fair Value |  | 293,005
Unrealized Losses |  | (5,943)
U.S. Government-sponsored agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 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 | 10,683 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (472) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 10,683 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (472) |
Less than 12 months, Fair Value |  | 7,161
Less than 12 months, Unrealized Losses |  | (94)
12 months or more, Fair Value |  | 3,814
12 months or more, Unrealized Losses |  | (86)
Fair Value |  | 10,975
Unrealized Losses |  | (180)
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 76,050 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,061) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 185,136 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5,926) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 261,186 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (6,987) |
Less than 12 months, Fair Value |  | 132,025
Less than 12 months, Unrealized Losses |  | (1,857)
12 months or more, Fair Value |  | 101,707
12 months or more, Unrealized Losses |  | (2,693)
Fair Value |  | 233,732
Unrealized Losses |  | (4,550)
State and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 76,809 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,784) |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 45,052 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,873) |
Debt Securities, Available-for-sale, Unrealized Loss Position | 121,861 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ (5,657) |
Less than 12 months, Fair Value |  | 9,425
Less than 12 months, Unrealized Losses |  | (149)
12 months or more, Fair Value |  | 38,864
12 months or more, Unrealized Losses |  | (1,061)
Fair Value |  | 48,289
Unrealized Losses |  | (1,210)
Other equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair Value |  | 0
Less than 12 months, Unrealized Losses |  | 0
12 months or more, Fair Value |  | 9
12 months or more, Unrealized Losses |  | (3)
Fair Value |  | 9
Unrealized Losses |  | $ (3)

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