Loans and Allowance for Loan Losses (Changes in Carrying Amount of Acquired-Impaired Loans and Accretable Yield) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Carrying Amount of Loans, Balance at end of period	$ 221,893
FDIC Acquired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Carrying Amount of Loans, Balance at beginning of period	203,297	$ 252,409
Carrying Amount of Loans, Payments received, net	(7,290)	(62,579)
Carrying Amount of Loans, Accretion	3,209	13,467
Carrying Amount of Loans, Balance at end of period	199,216	203,297
Accretable Yield, Balance at beginning of period	91,564	112,788
Accretable Yield, Payments received, net	(28)	(422)
Accretable Yield, Accretion	(3,209)	(13,467)
Accretable Yield, Increase (decrease) in expected cash flows based on actual cash flows and changes in cash flow assumptions	4,207	(3,537)
Accretable Yield, Net transfers to (from) nonaccretable difference to accretable yield	3,776	(3,798)
Accretable Yield, Balance at end of period	96,310	91,564
Acquired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Carrying Amount of Loans, Balance at beginning of period	22,541	61,276
Carrying Amount of Loans, Payments received, net	(2,145)	(53,268)
Carrying Amount of Loans, Accretion	2,281	14,533
Carrying Amount of Loans, Balance at end of period	22,677	22,541
Accretable Yield, Balance at beginning of period	37,924	74,668
Accretable Yield, Payments received, net	(2,598)	(21,556)
Accretable Yield, Accretion	(2,281)	(14,533)
Accretable Yield, Increase (decrease) in expected cash flows based on actual cash flows and changes in cash flow assumptions	56	(701)
Accretable Yield, Net transfers to (from) nonaccretable difference to accretable yield	947	46
Accretable Yield, Balance at end of period	$ 34,048	$ 37,924

Certain loans acquired in transfer not accounted for as debt securities accretable yield payment received net.

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- Definition

Certain loans acquired in transfer not accounted for as debt securities, carrying amount, accretion.

+ References

No definition available.

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- Definition

Certain loans acquired in transfer not accounted for as debt securities, payments received, net.

+ References

No definition available.

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- Definition

Net Accretable Discount Decrease Increase In Expected Cash Flows Based On Actual Cash Flow And Changes In Cash Flow

+ References

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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=6379141&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=27045933&loc=d3e13503-111538

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- Definition

Amount of decrease from accretion 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 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27045933&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=6379141&loc=d3e15032-111544

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- Definition

Amount of reclassification (to) from nonaccretable difference (from) to 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=6379141&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=27045933&loc=d3e13503-111538

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