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Intangible Assets - Summary Of Intangible Assets and Accumulated Amortization Included In The Consolidated Statements of Condition (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 240,637 | $ 240,637
Accumulated Amortization | (91,819) | (85,603)
Net Carrying Value | 148,818 | 155,034
Core deposit intangibles |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 157,150 | 157,150
Accumulated Amortization | (32,955) | (28,150)
Net Carrying Value | 124,195 | 129,000
Customer relationships |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 77,865 | 77,865
Accumulated Amortization | (56,744) | (55,597)
Net Carrying Value | 21,121 | 22,268
Other |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,622 | 5,622
Accumulated Amortization | (2,120) | (1,856)
Net Carrying Value | 3,502 | 3,766
State banking licenses |  |
Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets, excluding goodwill | $ 300 | $ 300

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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