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Loans and Allowance for Loan Losses (Changes in Carrying Amount of Purchased Credit Impaired Loans and Related Accretable Yield) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017
Loans and Allowance for Loan Losses [Abstract] |  |
Carrying Amount of Loans, Balance at beginning of period | $ 153,403 | $ 190,915
Carrying Amount of Loans, Payments received, net | (8,288) | (69,591)
Carrying Amount of Loans, Accretion | 4,268 | 17,079
Carrying Amount of Loans, Balance at end of period | 149,383 | 153,403
Accretable Yield, Balance at beginning of period | 62,517 | 113,686
Accretable Yield, Payments received, net | (1,703) | (7,412)
Accretable Yield, Accretion | (4,268) | (17,079)
Accretable Yield, Increase (decrease) in expected cash flows based on actual cash flow and changes in cash flow assumptions | (956) | (30,379)
Accretable Yield, Net transfers from nonaccretable difference to accretable yield |  | 3,701
Accretable Yield, Balance at end of period | $ 55,590 | $ 62,517

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- Definition Certain loans acquired in transfer not accounted for as debt securities accretable yield payment received net. + References No definition available. + Details
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- Definition Certain loans acquired in transfer not accounted for as debt securities, carrying amount, accretion. + References No definition available. + Details
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- Definition Certain loans acquired in transfer not accounted for as debt securities, payments received, net. + References No definition available. + Details
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- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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- Definition Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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