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Investment Securities - Other Than Temporarily Impaired Debt Securities (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) security | Dec. 31, 2015 USD ($) security | Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |  |
Number of securities considered other than temporarily impaired | security | 0 |  |
Other-than-temporary impairment on securities available-for-sale | $ 0 | $ 0 | $ 13
Number of investment securities in unrealized loss positions | security | 134 | 54 |
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Held-to-maturity, Less than 12 continuous months, Fair value | $ 9,130 | $ 14,152 |
Held-to-maturity, Less than 12 continuous months, Unrealized loss | (161) | (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 | 9,130 | 16,151 |
Held-to-maturity, Total securities in a loss position, Unrealized loss | (161) | (42) |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale, Less than 12 continuous months, Fair value | 284,314 | 221,857 |
Available-for-sale, Less than 12 continuous months, Unrealized loss | (6,197) | (1,273) |
Available-for-sale, Greater than 12 continuous months, Fair value | 9,946 | 17,987 |
Available-for-sale, Greater than 12 continuous months, Unrealized loss | (52) | (233) |
Available-for-sale, Total securities in a loss position, Fair value | 294,260 | 239,844 |
Available-for-sale, Total securities in a loss position, Unrealized loss | (6,249) | (1,506) |
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract] |  |  |
Total temporarily impaired securities, Less than 12 continuous months, Fair value | 293,444 | 236,009 |
Total temporarily impaired securities, Less than 12 continuous months, Unrealized loss | (6,358) | (1,314) |
Total temporarily impaired securities, Greater than 12 continuous months, Fair value | 9,946 | 19,986 |
Total temporarily impaired securities, Greater than 12 continuous months, Unrealized loss | (52) | (234) |
Total temporarily impaired securities, Total securities in a loss position, Fair value | 303,390 | 255,995 |
Total temporarily impaired securities, Total securities in a loss position, Unrealized loss | $ (6,410) | (1,548) |
Number of securities in continuous loss position for more than 12 months | security | 1 |  |
Number of securities in continuous loss position for less than 12 months | security | 133 |  |
Net loss on sale of available for sale securities sold | $ 64 | 1 | $ 28
MBS pass-through securities |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale, Less than 12 continuous months, Fair value | 162,016 | 68,809 |
Available-for-sale, Less than 12 continuous months, Unrealized loss | (3,577) | (454) |
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 | 162,016 | 68,809 |
Available-for-sale, Total securities in a loss position, Unrealized loss | $ (3,577) | (454) |
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract] |  |  |
Number of securities in continuous loss position for less than 12 months | security | 31 |  |
Collateralized Mortgage Obligations |  |  |
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract] |  |  |
Number of securities in continuous loss position for less than 12 months | security | 13 |  |
CMOs issued by FNMA |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale, Less than 12 continuous months, Fair value | $ 9,498 | 9,277 |
Available-for-sale, Less than 12 continuous months, Unrealized loss | (109) | (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 | 9,498 | 12,435 |
Available-for-sale, Total securities in a loss position, Unrealized loss | (109) | (144) |
CMOs issued by FHLMC |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale, Less than 12 continuous months, Fair value | 31,545 | 0 |
Available-for-sale, Less than 12 continuous months, Unrealized loss | (731) | 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 | 31,545 | 1,989 |
Available-for-sale, Total securities in a loss position, Unrealized loss | (731) | (39) |
CMOs issued by GNMA |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale, Less than 12 continuous months, Fair value | 1,583 | 164 |
Available-for-sale, Less than 12 continuous months, Unrealized loss | (1) | 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 | 1,583 | 2,538 |
Available-for-sale, Total securities in a loss position, Unrealized loss | (1) | (15) |
Debentures of government-sponsored agencies |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale, Less than 12 continuous months, Fair value | 19,951 | 136,064 |
Available-for-sale, Less than 12 continuous months, Unrealized loss | (38) | (713) |
Available-for-sale, Greater than 12 continuous months, Fair value | 9,946 | 9,887 |
Available-for-sale, Greater than 12 continuous months, Unrealized loss | (52) | (113) |
Available-for-sale, Total securities in a loss position, Fair value | 29,897 | 145,951 |
Available-for-sale, Total securities in a loss position, Unrealized loss | $ (90) | (826) |
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract] |  |  |
Number of securities in continuous loss position for less than 12 months | security | 1 |  |
Obligations of state and political subdivisions |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale, Less than 12 continuous months, Fair value | $ 59,567 | 4,557 |
Available-for-sale, Less than 12 continuous months, Unrealized loss | (1,740) | (15) |
Available-for-sale, Greater than 12 continuous months, Fair value |  | 579 |
Available-for-sale, Greater than 12 continuous months, Unrealized loss |  | (2) |
Available-for-sale, Total securities in a loss position, Fair value | 59,567 | 5,136 |
Available-for-sale, Total securities in a loss position, Unrealized loss | $ (1,740) | (17) |
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract] |  |  |
Number of securities in continuous loss position for less than 12 months | security | 86 |  |
Corporate bonds |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
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) |
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract] |  |  |
Number of securities in continuous loss position for less than 12 months | security | 1 |  |
Privately-issued CMOs |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale, Less than 12 continuous months, Fair value | $ 154 |  |
Available-for-sale, Less than 12 continuous months, Unrealized loss | (1) |  |
Available-for-sale, Greater than 12 continuous months, Fair value |  |  |
Available-for-sale, Greater than 12 continuous months, Unrealized loss |  |  |
Available-for-sale, Total securities in a loss position, Fair value | 154 |  |
Available-for-sale, Total securities in a loss position, Unrealized loss | $ (1) |  |
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract] |  |  |
Number of securities in continuous loss position for less than 12 months | security | 1 |  |
MBS pass-through securities |  |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Held-to-maturity, Less than 12 continuous months, Fair value | $ 2,250 | 2,332 |
Held-to-maturity, Less than 12 continuous months, Unrealized loss | (154) | (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 | 2,250 | 2,332 |
Held-to-maturity, Total securities in a loss position, Unrealized loss | (154) | (7) |
Obligations of state and political subdivisions |  |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Held-to-maturity, Less than 12 continuous months, Fair value | 3,362 | 8,297 |
Held-to-maturity, Less than 12 continuous months, Unrealized loss | (6) | (19) |
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 | 3,362 | 8,297 |
Held-to-maturity, Total securities in a loss position, Unrealized loss | (6) | (19) |
Corporate bonds |  |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Held-to-maturity, Less than 12 continuous months, Fair value | 3,518 | 3,523 |
Held-to-maturity, Less than 12 continuous months, Unrealized loss | (1) | (15) |
Held-to-maturity, Greater than 12 continuous months, Fair value |  | 1,999 |
Held-to-maturity, Greater than 12 continuous months, Unrealized loss |  | (1) |
Held-to-maturity, Total securities in a loss position, Fair value | 3,518 | 5,522 |
Held-to-maturity, Total securities in a loss position, Unrealized loss | $ (1) | $ (16) |

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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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