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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details) $ in Thousands | Sep. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 55 | 36
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 387,477 | $ 271,852
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ (8,463) | $ (1,373)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 22 | 15
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 162,251 | $ 113,210
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (7,110) | $ (2,594)
Temporarily Impaired Debt Securities, Number of Securities | security | 77 | 51
Temporarily Impaired Debt Securities, Fair Value, Total | $ 549,728 | $ 385,062
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (15,573) | $ (3,967)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security | 0 | 3
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 0 | $ 19,789
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ 0 | $ (154)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 1 | 0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 9,556 | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (400) | $ 0
Temporarily Impaired Debt Securities, Number of Securities | security | 1 | 3
Temporarily Impaired Debt Securities, Fair Value, Total | $ 9,556 | $ 19,789
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (400) | $ (154)
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 | 17 | 9
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 135,988 | $ 63,635
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ (2,280) | $ (144)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 1 | 1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 995 | $ 10,017
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (8) | $ (49)
Temporarily Impaired Debt Securities, Number of Securities | security | 18 | 10
Temporarily Impaired Debt Securities, Fair Value, Total | $ 136,983 | $ 73,652
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (2,288) | $ (193)
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 | 10 | 7
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 64,732 | $ 47,465
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ (1,365) | $ (248)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 8 | 7
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 48,308 | $ 45,809
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (2,258) | $ (1,073)
Temporarily Impaired Debt Securities, Number of Securities | security | 18 | 14
Temporarily Impaired Debt Securities, Fair Value, Total | $ 113,040 | $ 93,274
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (3,623) | $ (1,321)
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 | 4 | 1
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 9,361 | $ 2,333
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ (182) | $ (10)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 2 | 2
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 7,194 | $ 8,638
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (424) | $ (203)
Temporarily Impaired Debt Securities, Number of Securities | security | 6 | 3
Temporarily Impaired Debt Securities, Fair Value, Total | $ 16,555 | $ 10,971
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (606) | $ (213)
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 | 17 | 14
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 148,398 | $ 128,300
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ (4,474) | $ (775)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 10 | 5
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 96,198 | $ 48,746
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ (4,020) | $ (1,269)
Temporarily Impaired Debt Securities, Number of Securities | security | 27 | 19
Temporarily Impaired Debt Securities, Fair Value, Total | $ 244,596 | $ 177,046
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (8,494) | $ (2,044)
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 | 7 | 2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value | $ 28,998 | $ 10,330
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses | $ (162) | $ (42)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security | 0 | 0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value | $ 0 | $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses | $ 0 | $ 0
Temporarily Impaired Debt Securities, Number of Securities | security | 7 | 2
Temporarily Impaired Debt Securities, Fair Value, Total | $ 28,998 | $ 10,330
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (162) | $ (42)

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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