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Investment Securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value, Less than 12 months | $ 410,397 | $ 444,968
Unrealized Loss, Less than 12 months | 6,294 | 9,409
Fair Value, 12 months or more | 20,779 | 22,199
Unrealized Loss, 12 months or more | 721 | 810
Fair Value, Total | 431,176 | 467,167
Unrealized Losses, Total | 7,015 | 10,219
Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value, Less than 12 months | 410,397 | 444,968
Unrealized Loss, Less than 12 months | 6,294 | 9,409
Fair Value, 12 months or more | 17,746 | 19,073
Unrealized Loss, 12 months or more | 591 | 675
Fair Value, Total | 428,143 | 464,041
Unrealized Losses, Total | 6,885 | 10,084
Debt Securities | U.S. Government Agency Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value, Less than 12 months | 990 | 985
Unrealized Loss, Less than 12 months | 9 | 13
Fair Value, Total | 990 | 985
Unrealized Losses, Total | 9 | 13
Debt Securities | Mortgage-backed Securities - Residential |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value, Less than 12 months | 366,265 | 390,595
Unrealized Loss, Less than 12 months | 5,402 | 7,230
Fair Value, 12 months or more | 17,527 | 19,073
Unrealized Loss, 12 months or more | 580 | 675
Fair Value, Total | 383,792 | 409,668
Unrealized Losses, Total | 5,982 | 7,905
Debt Securities | Municipals, Tax Exempt |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value, Less than 12 months | 32,832 | 43,132
Unrealized Loss, Less than 12 months | 868 | 2,114
Fair Value, 12 months or more | 219 |
Unrealized Loss, 12 months or more | 11 |
Fair Value, Total | 33,051 | 43,132
Unrealized Losses, Total | 879 | 2,114
Debt Securities | Treasury Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value, Less than 12 months | 10,310 | 10,256
Unrealized Loss, Less than 12 months | 15 | 52
Fair Value, Total | 10,310 | 10,256
Unrealized Losses, Total | 15 | 52
Equity Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value, 12 months or more | 3,033 | 3,126
Unrealized Loss, 12 months or more | 130 | 135
Fair Value, Total | 3,033 | 3,126
Unrealized Losses, Total | $ 130 | $ 135

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a 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 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + 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 + Details
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