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Goodwill and Other Intangible Assets (Aggregate Amortization Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |
Aggregate amortization expense | $ 19,781 | $ 24,184 | $ 26,797
Core Deposit Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Aggregate amortization expense | 16,411 | 18,031 | 19,897
Credit Card and Trust Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Aggregate amortization expense | 2,172 | 2,369 | 2,566
Value of Insurance Business Acquired [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Aggregate amortization expense |  |  | 34
Non-Compete Agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Aggregate amortization expense |  |  | 100
Trade Name [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Aggregate amortization expense |  | 2,388 | 2,605
Merchant Processing Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Aggregate amortization expense | $ 1,198 | $ 1,396 | $ 1,595

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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