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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 5,148 | $ 152,859 | $ 280,229
Unrealized Losses (Less than 12 months) | (9) | (2,845) | (7,761)
Fair Value (Estimated) (12 months or more) | 79,595 | 240,871 | 132,575
Unrealized Losses (12 months or more) | (1,277) | (10,271) | (6,993)
Fair Value (Estimated) | 84,743 | 393,730 | 412,804
Unrealized Losses | (1,286) | (13,116) | (14,754)
U.S. Government-sponsored agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) |  | 0 | 6,882
Unrealized Losses (Less than 12 months) |  | 0 | (373)
Fair Value (Estimated) (12 months or more) |  | 10,683 | 3,689
Unrealized Losses (12 months or more) |  | (472) | (211)
Fair Value (Estimated) |  | 10,683 | 10,571
Unrealized Losses |  | (472) | (584)
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 4,150 | 76,050 | 202,673
Unrealized Losses (Less than 12 months) | 0 | (1,061) | (5,660)
Fair Value (Estimated) (12 months or more) | 49,270 | 185,136 | 91,977
Unrealized Losses (12 months or more) | (790) | (5,926) | (3,757)
Fair Value (Estimated) | 53,420 | 261,186 | 294,650
Unrealized Losses | (790) | (6,987) | (9,417)
State and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 998 | 76,809 | 70,674
Unrealized Losses (Less than 12 months) | (9) | (1,784) | (1,728)
Fair Value (Estimated) (12 months or more) | 30,325 | 45,052 | 36,909
Unrealized Losses (12 months or more) | (487) | (3,873) | (3,025)
Fair Value (Estimated) | 31,323 | 121,861 | 107,583
Unrealized Losses | $ (496) | $ (5,657) | $ (4,753)

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