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Investment Securities - Investment Securities in Unrealized Loss Positions (Details) $ in Thousands | Sep. 30, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
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Investments, Debt and Equity Securities [Abstract] |  |
Number of investment securities other-than-temporarily impaired | security | 0 |
Number of investment securities in unrealized loss position | security | 67 | 134
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 continuous months | $ 17,764 | $ 9,130
Greater than or equal to 12 continuous months | 33,006 | 0
Total Securities in a loss position | 50,770 | 9,130
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 continuous months | (115) | (161)
Greater than or equal to 12 continuous months | (33) | 0
Held-to-maturity, Gross Unrealized Losses | (148) | (161)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Available-for-sale, less than 12 continuous months, Fair value | 75,503 | 284,314
Available-for-sale, greater than 12 continuous months, Fair value | 30,284 | 9,946
Available-for-sale, Total Securities in a loss position, Fair Value | 105,787 | 294,260
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Available-for-sale, less than 12 continuous months, Unrealized loss | (438) | (6,197)
Available-for-sale, greater than 12 continuous months, Unrealized loss | (415) | (52)
Available-for-sale, Total Securities in a loss position, Unrealized loss | (853) | (6,249)
Marketable Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Marketable securities, less than 12 continuous months, Fair value | 93,267 | 293,444
Marketable securities, greater than 12 continuous months, Fair value | 63,290 | 9,946
Marketable securities, Total Securities in a loss position, Fair value | 156,557 | 303,390
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Marketable securities, less than 12 continuous months, Unrealized loss | (553) | (6,358)
Marketable securities, greater than 12 continuous months, Unrealized loss | (448) | (52)
Marketable securities, Total Securities in a loss position, Unrealized loss | $ (1,001) | (6,410)
Number of investment securities in unrealized loss position less than 12 months | security | 30 |
MBS pass-through securities issued by FHLMC and FNMA |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Available-for-sale, less than 12 continuous months, Fair value | $ 21,619 | 162,016
Available-for-sale, greater than 12 continuous months, Fair value | 2,321 | 0
Available-for-sale, Total Securities in a loss position, Fair Value | 23,940 | 162,016
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Available-for-sale, less than 12 continuous months, Unrealized loss | (229) | (3,577)
Available-for-sale, greater than 12 continuous months, Unrealized loss | (10) | 0
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (239) | (3,577)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Number of investment securities in unrealized loss position longer than 12 months | security | 5 |
Number of investment securities in unrealized loss position less than 12 months | security | 12 |
CMOs issued by FNMA |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Available-for-sale, less than 12 continuous months, Fair value | $ 8,005 | 9,498
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 0
Available-for-sale, Total Securities in a loss position, Fair Value | 8,005 | 9,498
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Available-for-sale, less than 12 continuous months, Unrealized loss | (43) | (109)
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | 0
Available-for-sale, Total Securities in a loss position, Unrealized loss | (43) | (109)
CMOs issued by FHLMC |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Available-for-sale, less than 12 continuous months, Fair value | 15,014 | 31,545
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 0
Available-for-sale, Total Securities in a loss position, Fair Value | 15,014 | 31,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Available-for-sale, less than 12 continuous months, Unrealized loss | (13) | (731)
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | 0
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (13) | (731)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Number of investment securities in unrealized loss position longer than 12 months | security | 1 |
CMOs issued by GNMA |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Available-for-sale, less than 12 continuous months, Fair value | $ 4,807 | 1,583
Available-for-sale, greater than 12 continuous months, Fair value | 0 | 0
Available-for-sale, Total Securities in a loss position, Fair Value | 4,807 | 1,583
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Available-for-sale, less than 12 continuous months, Unrealized loss | (51) | (1)
Available-for-sale, greater than 12 continuous months, Unrealized loss | 0 | 0
Available-for-sale, Total Securities in a loss position, Unrealized loss | (51) | (1)
Debentures of government- sponsored agencies |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Available-for-sale, less than 12 continuous months, Fair value | 19,929 | 19,951
Available-for-sale, greater than 12 continuous months, Fair value | 9,953 | 9,946
Available-for-sale, Total Securities in a loss position, Fair Value | 29,882 | 29,897
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Available-for-sale, less than 12 continuous months, Unrealized loss | (64) | (38)
Available-for-sale, greater than 12 continuous months, Unrealized loss | (46) | (52)
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (110) | (90)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Number of investment securities in unrealized loss position longer than 12 months | security | 1 |
Number of investment securities in unrealized loss position less than 12 months | security | 1 |
Obligations of state and political subdivisions |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Available-for-sale, less than 12 continuous months, Fair value | $ 6,129 | 59,567
Available-for-sale, greater than 12 continuous months, Fair value | 18,010 | 0
Available-for-sale, Total Securities in a loss position, Fair Value | 24,139 | 59,567
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Available-for-sale, less than 12 continuous months, Unrealized loss | (38) | (1,740)
Available-for-sale, greater than 12 continuous months, Unrealized loss | (359) | 0
Available-for-sale, Total Securities in a loss position, Unrealized loss | $ (397) | (1,740)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Number of investment securities in unrealized loss position longer than 12 months | security | 30 |
Number of investment securities in unrealized loss position less than 12 months | security | 8 |
Corporate bonds |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Available-for-sale, less than 12 continuous months, Fair value |  | 154
Available-for-sale, greater than 12 continuous months, Fair value |  | 0
Available-for-sale, Total Securities in a loss position, Fair Value |  | 154
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Available-for-sale, less than 12 continuous months, Unrealized loss |  | (1)
Available-for-sale, greater than 12 continuous months, Unrealized loss |  | 0
Available-for-sale, Total Securities in a loss position, Unrealized loss |  | (1)
Privately-issued collateralized mortgage obligations |  |
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Number of investment securities in unrealized loss position less than 12 months | security | 9 |
Obligations of state and political subdivisions |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 continuous months |  | 2,250
Greater than or equal to 12 continuous months |  | 0
Total Securities in a loss position |  | 2,250
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 continuous months |  | (154)
Greater than or equal to 12 continuous months |  | 0
Held-to-maturity, Gross Unrealized Losses |  | (154)
Corporate bonds |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 continuous months |  | 3,362
Greater than or equal to 12 continuous months |  | 0
Total Securities in a loss position |  | 3,362
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 continuous months |  | (6)
Greater than or equal to 12 continuous months |  | 0
Held-to-maturity, Gross Unrealized Losses |  | (6)
MBS pass-through securities issued by FHLMC and FNMA |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 continuous months | $ 17,764 | 3,518
Greater than or equal to 12 continuous months | 31,501 | 0
Total Securities in a loss position | 49,265 | 3,518
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 continuous months | (115) | (1)
Greater than or equal to 12 continuous months | (30) | 0
Held-to-maturity, Gross Unrealized Losses | (145) | $ (1)
CMOs issued by FHLMC |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 continuous months | 0 |
Greater than or equal to 12 continuous months | 1,505 |
Total Securities in a loss position | 1,505 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 continuous months | 0 |
Greater than or equal to 12 continuous months | $ (3) |

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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=82897076&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=82897076&loc=d3e27337-111563 + Details
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