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Investment Securities - Schedule of Unrealized Loss on Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | $ 860,016 | $ 711,142
12 Months or Longer | 47,163 | 309,633
Total | 907,179 | 1,020,775
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 11,778 | 4,893
12 Months or Longer | 531 | 5,921
Total | 12,309 | 10,814
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 134,909 |
12 Months or Longer | 7,564 |
Total | 142,473 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 5,148 |
12 Months or Longer | 87 |
Total | 5,235 |
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 247,695 | 326,973
12 Months or Longer | 19,838 | 195,090
Total | 267,533 | 522,063
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 2,305 | 2,117
12 Months or Longer | 162 | 3,425
Total | 2,467 | 5,542
U.S. Government sponsored entity asset-backed securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 612,321 | 384,169
12 Months or Longer | 27,325 | 114,543
Total | 639,646 | 498,712
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 9,473 | 2,776
12 Months or Longer | 369 | 2,496
Total | 9,842 | 5,272
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months |  | 5,656
12 Months or Longer | 7,564 | 7,792
Total | 7,564 | 13,448
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months |  | 10
12 Months or Longer | 87 | 124
Total | 87 | $ 134
Obligations of States and Political Subdivisions |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 134,909 |
Total | 134,909 |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 5,148 |
Total | $ 5,148 |

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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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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: 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 Reference 2: 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 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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)(1) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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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 less than twelve months. + 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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