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Premises and Equipment, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment before accumulated depreciation | $ 178,851 | $ 177,280 |
Accumulated depreciation | 97,546 | 93,093 |
Total premises and equipment | 81,305 | 84,187 |
Rental expense | 8,500 | 7,800 | $ 7,900
Future Minimum Rental Payments [Abstract] |  |  |
2018 | 7,910 |  |
2019 | 7,227 |  |
2020 | 6,547 |  |
2021 | 5,352 |  |
2022 | 4,646 |  |
Thereafter | 16,660 |  |
Total | 48,342 |  |
Land, Buildings and Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment before accumulated depreciation | 121,771 | 121,037 |
Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment before accumulated depreciation | $ 57,080 | $ 56,243 |
Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 10 years |  |
Building and Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 15 years |  |
Building and Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 40 years |  |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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