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Investment Securities - Investment Securities in Unrealized Loss Positions (Details) $ in Thousands | Sep. 30, 2016 USD ($) security | Dec. 31, 2015 USD ($) security
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Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Number of investment securities other-than-temporarily impaired | security | 0 |
Number of investment securities in unrealized loss position | security | 37 | 54
Held-to-maturity, less than 12 continuous months, Fair value | $ 4,070 | $ 14,152
Held-to-maturity, less than 12 continuous months, Unrealized loss | (4) | (41)
Held-to-maturity, greater than 12 continuous months, Fair value | 0 | 1,999
Held-to-maturity, greater than 12 continuous months, Unrealized loss | 0 | (1)
Held-to-maturity, Total Securities in a loss position, Fair value | 4,070 | 16,151
Held-to-maturity, Gross Unrealized Losses | (4) | (42)
Available-for-sale, less than 12 continuous months, Fair value | 98,619 | 221,857
Available-for-sale, less than 12 continuous months, Unrealized loss | (329) | (1,273)
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 17,987
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | (233)
Available-for-sale, Total Securities in a loss position, Fair Value | 98,619 | 239,844
Available-for-sale, Total Securities in a loss position, Unrealized loss | (329) | (1,506)
Marketable securities, less than 12 continuous months, Fair value | 102,689 | 236,009
Marketable securities, less than 12 continuous months, Unrealized loss | (333) | (1,314)
Marketable securities, greater than 12 continuous months, Fair value | 0 | 19,986
Marketable securities, greater than 12 continuous months, Unrealized loss | 0 | (234)
Marketable securities, Total Securities in a loss position, Fair value | 102,689 | 255,995
Marketable securities, Total Securities in a loss position, Unrealized loss | $ (333) | (1,548)
Number of investment securities in unrealized loss position less than 12 months | security | 37 |
MBS pass-through securities issued by FHLMC and FNMA |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value | $ 69,229 | 68,809
Available-for-sale, less than 12 continuous months, Unrealized loss | (227) | (454)
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 0
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | 0
Available-for-sale, Total Securities in a loss position, Fair Value | 69,229 | 68,809
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (227) | (454)
Number of investment securities in unrealized loss position less than 12 months | security | 10 |
CMOs issued by FNMA |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value |  | 9,277
Available-for-sale, less than 12 continuous months, Unrealized loss |  | (80)
Available-for-sale, greater than 12 continuous months, Fair value |  | 3,158
Available-for-sale, greater than 12 continuous months, Unrealized loss |  | (64)
Available-for-sale, Total Securities in a loss position, Fair Value |  | 12,435
Available-for-sale, Total Securities in a loss position, Unrealized loss |  | (144)
CMOs issued by FHLMC |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value |  | 0
Available-for-sale, less than 12 continuous months, Unrealized loss |  | 0
Available-for-sale, greater than 12 continuous months, Fair value |  | 1,989
Available-for-sale, greater than 12 continuous months, Unrealized loss |  | (39)
Available-for-sale, Total Securities in a loss position, Fair Value |  | 1,989
Available-for-sale, Total Securities in a loss position, Unrealized loss |  | (39)
CMOs issued by GNMA |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value |  | 164
Available-for-sale, less than 12 continuous months, Unrealized loss |  | 0
Available-for-sale, greater than 12 continuous months, Fair value |  | 2,374
Available-for-sale, greater than 12 continuous months, Unrealized loss |  | (15)
Available-for-sale, Total Securities in a loss position, Fair Value |  | 2,538
Available-for-sale, Total Securities in a loss position, Unrealized loss |  | (15)
Debentures of government- sponsored agencies |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value | $ 14,992 | 136,064
Available-for-sale, less than 12 continuous months, Unrealized loss | (8) | (713)
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 9,887
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | (113)
Available-for-sale, Total Securities in a loss position, Fair Value | 14,992 | 145,951
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (8) | (826)
Number of investment securities in unrealized loss position less than 12 months | security | 2 |
Privately issued CMOs |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value | $ 162 |
Available-for-sale, less than 12 continuous months, Unrealized loss | (1) |
Available-for-sale, greater than 12 continuous months, Fair value | 0 |
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 |
Available-for-sale, Total Securities in a loss position, Fair Value | 162 |
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (1) |
Number of investment securities in unrealized loss position less than 12 months | security | 1 |
Obligations of state and political subdivisions |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value | $ 14,236 | 4,557
Available-for-sale, less than 12 continuous months, Unrealized loss | (93) | (15)
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 579
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | (2)
Available-for-sale, Total Securities in a loss position, Fair Value | 14,236 | 5,136
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (93) | (17)
Number of investment securities in unrealized loss position less than 12 months | security | 23 |
Corporate bonds |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available-for-sale, less than 12 continuous months, Fair value |  | 2,986
Available-for-sale, less than 12 continuous months, Unrealized loss |  | (11)
Available-for-sale, greater than 12 continuous months, Fair value |  | 0
Available-for-sale, greater than 12 continuous months, Unrealized loss |  | 0
Available-for-sale, Total Securities in a loss position, Fair Value |  | 2,986
Available-for-sale, Total Securities in a loss position, Unrealized loss |  | (11)
Number of investment securities in unrealized loss position less than 12 months | security | 1 |
Obligations of state and political subdivisions |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 continuous months, Fair value | $ 547 | 8,297
Held-to-maturity, less than 12 continuous months, Unrealized loss | (3) | (19)
Held-to-maturity, greater than 12 continuous months, Fair value | 0 | 0
Held-to-maturity, greater than 12 continuous months, Unrealized loss | 0 | 0
Held-to-maturity, Total Securities in a loss position, Fair value | 547 | 8,297
Held-to-maturity, Gross Unrealized Losses | (3) | (19)
Corporate bonds |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 continuous months, Fair value | 3,523 | 3,523
Held-to-maturity, less than 12 continuous months, Unrealized loss | (1) | (15)
Held-to-maturity, greater than 12 continuous months, Fair value | 0 | 1,999
Held-to-maturity, greater than 12 continuous months, Unrealized loss | 0 | (1)
Held-to-maturity, Total Securities in a loss position, Fair value | 3,523 | 5,522
Held-to-maturity, Gross Unrealized Losses | $ (1) | (16)
MBS pass-through securities issued by FHLMC and FNMA |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity, less than 12 continuous months, Fair value |  | 2,332
Held-to-maturity, less than 12 continuous months, Unrealized loss |  | (7)
Held-to-maturity, greater than 12 continuous months, Fair value |  | 0
Held-to-maturity, greater than 12 continuous months, Unrealized loss |  | 0
Held-to-maturity, Total Securities in a loss position, Fair value |  | 2,332
Held-to-maturity, Gross Unrealized Losses |  | $ (7)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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