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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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	$ 4,965		$ 4,965		$ 7,678
Carrying value	3,674		3,674		5,192
Accretable Yield [Roll Forward]
Balance at beginning of period	3,711	$ 4,514	4,027	$ 3,649
Removals	(837)	0	(914)	(273)
Accretion	(128)	(126)	(367)	(494)
Reclassifications from nonaccretable difference	0	(242)	0	1,264
Balance at end of period	2,746	$ 4,146	2,746	$ 4,146
Commercial loans | Commercial and industrial
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	258		258		479
Carrying value	184		184		324
Commercial real estate loans
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	4,355		4,355		6,831
Carrying value	3,420		3,420		4,790
Commercial real estate loans | Construction
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	125		125		136
Carrying value	2		2		11
Residential loans | Home equity
PCI Loans, Carrying Value [Abstract]
Unpaid principal balance	227		227		232
Carrying value	$ 68		$ 68		$ 67

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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.

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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.

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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.

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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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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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