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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands | Mar. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 1 | 21
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 2,367 | $ 167,839
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ (5) | $ (1,757)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 53 | 44
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 380,443 | $ 307,481
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (3,673) | $ (6,871)
Temporarily Impaired Debt Securities, Number of Securities | security | 54 | 65
Temporarily Impaired Debt Securities, Fair Value, Total | $ 382,810 | $ 475,320
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (3,678) | $ (8,628)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 0
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 0
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 1 | 1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 9,837 | $ 9,736
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (124) | $ (222)
Temporarily Impaired Debt Securities, Number of Securities | security | 1 | 1
Temporarily Impaired Debt Securities, Fair Value, Total | $ 9,837 | $ 9,736
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (124) | $ (222)
Obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 7
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 67,649
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (613)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 8 | 6
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 65,828 | $ 35,760
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (267) | $ (461)
Temporarily Impaired Debt Securities, Number of Securities | security | 8 | 13
Temporarily Impaired Debt Securities, Fair Value, Total | $ 65,828 | $ 103,409
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (267) | $ (1,074)
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 1 | 2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 2,367 | $ 12,495
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ (5) | $ (44)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 14 | 14
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 72,936 | $ 76,179
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (1,161) | $ (1,941)
Temporarily Impaired Debt Securities, Number of Securities | security | 15 | 16
Temporarily Impaired Debt Securities, Fair Value, Total | $ 75,303 | $ 88,674
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1,166) | $ (1,985)
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 2,327
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (45)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 5 | 3
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 11,297 | $ 9,241
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (196) | $ (372)
Temporarily Impaired Debt Securities, Number of Securities | security | 5 | 5
Temporarily Impaired Debt Securities, Fair Value, Total | $ 11,297 | $ 11,568
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (196) | $ (417)
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 8
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 75,466
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (1,032)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 24 | 19
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 215,320 | $ 171,318
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (1,914) | $ (3,844)
Temporarily Impaired Debt Securities, Number of Securities | security | 24 | 27
Temporarily Impaired Debt Securities, Fair Value, Total | $ 215,320 | $ 246,784
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1,914) | $ (4,876)
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 9,902
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (23)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 1 | 1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 5,225 | $ 5,247
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (11) | $ (31)
Temporarily Impaired Debt Securities, Number of Securities | security | 1 | 3
Temporarily Impaired Debt Securities, Fair Value, Total | $ 5,225 | $ 15,149
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (11) | $ (54)

X
- 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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