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Loans and Allowance for Credit Losses (Details 2) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Recorded investment in loans: |  |
Loans individually evaluated for impairment | $ 39,376 | $ 30,191
Loans collectively evaluated for impairment | 6,563,150 | 6,381,337
Net loans | 6,602,526 | 6,411,528
Commercial [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 15,468 | 8,726
Loans collectively evaluated for impairment | 1,410,574 | 1,367,213
Net loans | 1,426,042 | 1,375,939
Income Producing - Commercial Real Estate [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 9,394 | 10,192
Loans collectively evaluated for impairment | 3,128,104 | 3,036,902
Net loans | 3,137,498 | 3,047,094
Owner Occupied - Commercial Real Estate - [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 7,771 | 5,501
Loans collectively evaluated for impairment | 792,976 | 749,943
Net loans | 800,747 | 755,444
Real Estate Mortgage - Residential [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 1,451 | 478
Loans collectively evaluated for impairment | 102,481 | 103,879
Net loans | 103,932 | 104,357
Construction - Commercial And Residencial [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 4,707 | 4,709
Loans collectively evaluated for impairment | 1,036,106 | 1,027,123
Net loans | 1,040,813 | 1,031,832
Home Equity [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 494 | 494
Loans collectively evaluated for impairment | 89,777 | 92,770
Net loans | 90,271 | 93,264
Other Consumer [Member] |  |
Recorded investment in loans: |  |
Loans individually evaluated for impairment | 91 | 91
Loans collectively evaluated for impairment | 3,132 | 3,507
Net loans | $ 3,223 | $ 3,598

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