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Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 28,783 | $ 152,859 | $ 254,875
Unrealized Losses (Less than 12 months) | (147) | (2,845) | (6,174)
Fair Value (Estimated) (12 months or more) | 267,315 | 240,871 | 141,888
Unrealized Losses (12 months or more) | (5,448) | (10,271) | (6,686)
Fair Value (Estimated) | 296,098 | 393,730 | 396,763
Unrealized Losses | (5,595) | (13,116) | (12,860)
U.S. Government-sponsored agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 0 | 0 | 6,946
Unrealized Losses (Less than 12 months) | 0 | 0 | (309)
Fair Value (Estimated) (12 months or more) | 10,875 | 10,683 | 3,694
Unrealized Losses (12 months or more) | (280) | (472) | (206)
Fair Value (Estimated) | 10,875 | 10,683 | 10,640
Unrealized Losses | (280) | (472) | (515)
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 24,525 | 76,050 | 183,335
Unrealized Losses (Less than 12 months) | (138) | (1,061) | (4,332)
Fair Value (Estimated) (12 months or more) | 198,272 | 185,136 | 101,012
Unrealized Losses (12 months or more) | (3,248) | (5,926) | (3,755)
Fair Value (Estimated) | 222,797 | 261,186 | 284,347
Unrealized Losses | (3,386) | (6,987) | (8,087)
State and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 1,264 | 76,809 | 64,594
Unrealized Losses (Less than 12 months) | (3) | (1,784) | (1,533)
Fair Value (Estimated) (12 months or more) | 58,168 | 45,052 | 37,182
Unrealized Losses (12 months or more) | (1,920) | (3,873) | (2,725)
Fair Value (Estimated) | 59,432 | 121,861 | 101,776
Unrealized Losses | (1,923) | $ (5,657) | $ (4,258)
Corporate securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 2,994 |  |
Unrealized Losses (Less than 12 months) | (6) |  |
Fair Value (Estimated) (12 months or more) | 0 |  |
Unrealized Losses (12 months or more) | 0 |  |
Fair Value (Estimated) | 2,994 |  |
Unrealized Losses | $ (6) |  |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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