Related Party Transactions (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Director | Deferred Compensation Agreement
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Related party transaction, expenses from transactions with related party		$ 424
Related party transaction, liability from acquisition		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
Director | Interest Guaranty Agreement, Proceeds From Liquidated Collateral
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Related party transactions, other revenues			7,998
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	25,794	24,669
Loans and leases receivable, related parties, additions	9,519
Loans and leases receivable, related parties, collections	9,342
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		764	839
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	306	309	262
Related party transactions, other revenues	77	61	47
1 Shareholder 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	18.00%
Entity Majority Owned by Shareholders and Directors
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Related party relationship, number of significant shareholders	1
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	255	224	243
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	60	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
Class A Common Stock
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Stock Repurchased and Retired During Period, Shares	362,121
Stock Repurchased and Retired During Period, Weighted Average Price	$ 25.07
Class A Common Stock | Director
Loans and Leases Receivable, Related Parties Disclosure [Abstract]
Stock Repurchased and Retired During Period, Shares	37,615
Stock Repurchased and Retired During Period, Weighted Average Price	$ 24.96