Loans and Allowance for Credit Losses - Changes in Allowance for Credit Losses (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	$ 9,208	$ 10,133	$ 11,396
Provision charged to operations	7,985	0	700
Losses charged to allowance	(9,834)	(1,446)	(2,850)
Recoveries	949	521	887
Allowance for credit losses, ending balance	8,308	9,208	10,133
Ending balance: individually evaluated for impairment	612	1,007
Ending balance: collectively evaluated for impairment	7,696	8,201
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	2,444	2,676
Provision charged to operations	9,660	166
Losses charged to allowance	(9,145)	(713)
Recoveries	171	315
Allowance for credit losses, ending balance	3,130	2,444
Ending balance: individually evaluated for impairment	230	469
Ending balance: collectively evaluated for impairment	2,900	1,975
Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	5,174	5,877
Provision charged to operations	(1,447)	(434)
Losses charged to allowance	(183)	(285)
Recoveries	514	16
Allowance for credit losses, ending balance	4,058	5,174
Ending balance: individually evaluated for impairment	162	465
Ending balance: collectively evaluated for impairment	3,896	4,709
Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	1,168	1,541
Provision charged to operations	152	(115)
Losses charged to allowance	(506)	(448)
Recoveries	264	190
Allowance for credit losses, ending balance	1,078	1,168
Ending balance: individually evaluated for impairment	220	73
Ending balance: collectively evaluated for impairment	858	1,095
Unallocated
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses, beginning balance	422	39
Provision charged to operations	(380)	383
Losses charged to allowance	0	0
Recoveries	0	0
Allowance for credit losses, ending balance	42	422
Ending balance: individually evaluated for impairment	0	0
Ending balance: collectively evaluated for impairment	$ 42	$ 422

A valuation allowance for financing receivables that are expected to be uncollectible.

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-Name Accounting Standards Codification

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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