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Loans and Allowance for Loan Losses - Troubled Debt Restructuring Modifications (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) contract	Sep. 30, 2014 USD ($) contract	Sep. 30, 2015 USD ($) loans contract	Sep. 30, 2014 USD ($) loans contract
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract	1	5	6	17
Pre-Modification Outstanding Recorded Investment	$ 700	$ 5,628	$ 1,704	$ 6,882
Post-Modification Outstanding Recorded Investment	700	5,700	1,803	6,992
Post-Modification Outstanding Recorded Investment at period end	$ 700	$ 5,690	$ 1,680	6,943
Pre-modification contract amount that subsequently paid off				905
Post-modification contract amount that subsequently paid off				$ 905
Number of modified TDR loans that defaulted | loans			0	0
Commercial loans | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract	1	2	5	7
Pre-Modification Outstanding Recorded Investment	$ 700	$ 513	$ 1,482	$ 1,336
Post-Modification Outstanding Recorded Investment	700	596	1,582	1,460
Post-Modification Outstanding Recorded Investment at period end	$ 700	$ 596	$ 1,463	$ 1,431
Commercial loans | Commercial real estate, owner-occupied
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract				1
Pre-Modification Outstanding Recorded Investment				$ 4,226
Post-Modification Outstanding Recorded Investment				4,216
Post-Modification Outstanding Recorded Investment at period end				$ 4,206
Commercial real estate loans | Commercial real estate, owner-occupied
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract		1
Pre-Modification Outstanding Recorded Investment		$ 4,226
Post-Modification Outstanding Recorded Investment		4,216
Post-Modification Outstanding Recorded Investment at period end		$ 4,206
Commercial real estate loans | Commercial real estate, investor
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract		1	1
Pre-Modification Outstanding Recorded Investment		$ 74	$ 222
Post-Modification Outstanding Recorded Investment		74	221
Post-Modification Outstanding Recorded Investment at period end		$ 74	$ 217
Commercial real estate loans | Construction
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract		1
Pre-Modification Outstanding Recorded Investment		$ 815
Post-Modification Outstanding Recorded Investment		814
Post-Modification Outstanding Recorded Investment at period end		$ 814
Residential loans | Other residential
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract				1
Pre-Modification Outstanding Recorded Investment				$ 815
Post-Modification Outstanding Recorded Investment				814
Post-Modification Outstanding Recorded Investment at period end				$ 814
Residential loans | Home equity
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract				2
Pre-Modification Outstanding Recorded Investment				$ 224
Post-Modification Outstanding Recorded Investment				224
Post-Modification Outstanding Recorded Investment at period end				$ 222
Consumer loans | Installment and other consumer
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified | contract				6
Pre-Modification Outstanding Recorded Investment				$ 281
Post-Modification Outstanding Recorded Investment				278
Post-Modification Outstanding Recorded Investment at period end				$ 270

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