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Loans and Allowance for Loan Losses - Purchased Credit-Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	$ 3,347		$ 3,347		$ 4,977
Carrying value	2,874		2,874		3,681
Accretable Yield [Roll Forward]
Balance at beginning of period	1,655	$ 3,711	2,618	$ 4,027
Removals	0	(837)	(778)	(914)
Accretion	(89)	(128)	(274)	(367)
Reclassifications from nonaccretable difference	0	0	0	0
Balance at end of period	1,566	$ 2,746	1,566	$ 2,746
Commercial loans | Commercial and industrial
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	47		47		237
Carrying value	40		40		175
Commercial real estate loans
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	3,080		3,080		4,329
Carrying value	2,763		2,763		3,437
Commercial real estate loans | Construction
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	0		0		187
Carrying value	0		0		1
Residential loans | Home equity
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	220		220		224
Carrying value	$ 71		$ 71		$ 68

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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)
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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

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- Definition

Amount of reduction, resulting from a sale or transfer of a loan, in 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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.

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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.

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The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as 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.

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