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Accumulated Other Comprehensive Loss Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains on sale of investment securities |  |  |  |  |  |  |  |  | $ 4,476 | $ 3,513 | $ 2,130
Income tax expense | $ 14,972 | $ 7,003 | $ 6,812 | $ 7,647 | $ 6,338 | $ 6,577 | $ 6,303 | $ 5,866 | 36,435 | 25,083 | 28,414
Net Income Available to Common Shareholders | $ 9,669 | $ 13,932 | $ 14,685 | $ 16,026 | $ 14,656 | $ 13,232 | $ 12,541 | $ 11,702 | 54,310 | 52,128 | 54,097
Unrealized Gains (Losses) on Securities Available-for-Sale | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains on sale of investment securities |  |  |  |  |  |  |  |  | 4,476 | 3,513 | 2,130
Income tax expense |  |  |  |  |  |  |  |  | 1,657 | 1,297 | 786
Net Income Available to Common Shareholders |  |  |  |  |  |  |  |  | $ 2,819 | $ 2,216 | $ 1,344

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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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