Contingencies and Commitments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Outstanding Commitments
Outstanding commitments	$ 881,550	$ 815,195
Commitments to Extend Credit
Outstanding Commitments
Outstanding commitments	866,885	802,595
Letters of Credit
Outstanding Commitments
Outstanding commitments	$ 14,665	$ 12,600

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant