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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | $ 999,877 |
Ending Balance | 1,021,192 | $ 946,849
Accumulated Other Comprehensive Income (Loss) [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (10,963) | (2,949)
Transfer of securities held-to-maturity to available-for-sale | (12,041) |
Other Comprehensive Income Loss Before Reclassifications Net Of Tax | 14,757 | (9,550)
Reclassification Out Of Accumulated Other Comprehensive Income | 200 | 314
Other Comprehensive Income (Loss) Other Net Of Tax | 2,916 | (9,236)
Ending Balance | (8,047) | (12,185)
Net unrealized gains on securities available for sale |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | (10,972) | (2,638)
Transfer of securities held-to-maturity to available-for-sale | (12,041) |
Other Comprehensive Income Loss Before Reclassifications Net Of Tax | 15,189 | (9,576)
Reclassification Out Of Accumulated Other Comprehensive Income | (17) | (60)
Other Comprehensive Income (Loss) Other Net Of Tax | 3,131 | (9,636)
Ending Balance | (7,841) | (12,274)
Net unrealized loss on cash flow hedges |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Beginning Balance | 9 | (311)
Transfer of securities held-to-maturity to available-for-sale | 0 |
Other Comprehensive Income Loss Before Reclassifications Net Of Tax | (432) | 26
Reclassification Out Of Accumulated Other Comprehensive Income | 217 | 374
Other Comprehensive Income (Loss) Other Net Of Tax | (215) | 400
Ending Balance | $ (206) | $ 89

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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- Definition Amount before tax and reclassification adjustments of unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e709-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=115930623&loc=d3e24883-111560 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 10 -Subparagraph (c),(d) -URI http://asc.fasb.org/extlink&oid=115930623&loc=d3e24820-111560 + Details
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