Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Shareholder
Related Party Transaction
Ownership percentage threshhold for related party	5.00%
Executive Officers, Directors, Shareholders Greater than Five Percent, and Related Entities and Individuals to Such Persons [Member]
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Loans and leases receivable, related parties	$ 36,067	$ 44,430
Loans and leases receivable, related parties, additions	15,751
Loans and leases receivable, related parties, collections	24,556
Loans and leases receivable, related parties, increase due to change in related parties	442
Director, Controlling Ownership Interest in Entity | Insurance Premiums
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Related party transaction, selling, general and administrative expenses from transactions with related party	839	1,328	879
Board of Directors Chairman, Wholly-Owned Entity | Aircraft Usage and Related Activities
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Related party transaction, expenses from transactions with related party	262	311	305
Related party transactions, other revenues	47	70	63
4 Shareholders Greater than 5% and 6 Directors
Related Party Transaction
Ownership percentage threshhold for related party	5.00%
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Ownership Percentage, Related Party	25.00%
Entity Majority Owned by Shareholders and Directors
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Related party relationship, number of significant shareholders	4
Related party relationship, number of directors	6
Entity Majority Owned by Shareholders and Directors | Education, Communication, Strategic Enterprise Planning and Corporate Governance Consultation
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Related party transaction, expenses from transactions with related party	243	250	337
Entity Majority Owned by Shareholders and Directors | Reimbursable Costs, Office Costs
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Related party transaction, expenses from transactions with related party	0		88
Director, Wholly-Owned Entity | Construction Management and Adivsory Services
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Related party transaction, expenses from transactions with related party	60
Related party transaction, contractual agreement, amount	180
Related party transaction, contractual agreement, percentage of contract price	4.00%
Related party transaction, contractual agreement, initial payment	60
Director | Deferred Compensation Agreement
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Related party transaction, expenses from transactions with related party	424	38	38,000
Related party transaction, liability from acquisition	424	577
Related party transaction, liability from acquisition, payout period	4 years
Director | Interest Guaranty Agreement, Interest Payments on Loans
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Revenue from related parties	815	954	487
Director | Interest Guaranty Agreement, Proceeds From Liquidated Collateral
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Related party transactions, other revenues	7,998
Director | Sale of Real Property, Proceeds
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Revenue from related parties	$ 2,695