Business Combinations (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	0 Months Ended	3 Months Ended	9 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Bancorporation	Sep. 30, 2014 Bancorporation	Jan. 02, 2014 1st Financial	Sep. 30, 2014 1st Financial	Sep. 30, 2014 1st Financial	Jan. 02, 2014 1st Financial As recorded by 1st Financial	Jan. 02, 2014 1st Financial Fair value adjustments	Sep. 30, 2014 Shares and Cash	Sep. 30, 2014 Shares and Cash Class A Common Stock	Sep. 30, 2014 Shares Only Class A Common Stock	Sep. 30, 2014 Shares Only Class B Common Stock
Business Acquisition [Line Items]
Consideration transferred							$ 10,000,000
Cash and cash equivalents							28,194,000			28,194,000	0
Investment securities available for sale							237,438,000			246,890,000	(9,452,000)
Loans held for sale							1,183,000			1,183,000	0
Restricted equity securities							3,776,000			3,105,000	671,000
Loans							316,327,000			338,170,000	(21,843,000)
Less: allowance for loan losses							0			(7,796,000)	7,796,000
Premises and equipment							2,686,000			3,871,000	(1,185,000)
Other real estate owned							11,591,000			12,896,000	(1,305,000)
Intangible asset							3,780,000			0	3,780,000
Other assets							16,346,000			16,811,000	(465,000)
Total assets acquired							621,321,000			643,324,000	(22,003,000)
Noninterest-bearing							152,444,000			152,444,000	0
Interest-bearing							479,427,000			477,881,000	1,546,000
Total deposits							631,871,000			630,325,000	1,546,000
Short-term borrowings							406,000			406,000	0
Other liabilities							3,559,000			3,392,000	167,000
Total liabilities assumed							635,836,000			634,123,000	1,713,000
Net assets acquired							14,515,000
Cash paid to shareholders							(2,000,000)
Cash paid to acquire TARP securities							(8,000,000)
Goodwill recorded for 1st Financial							24,515,000
Merger-related expenses	1,505,000	0	7,352,000	0	1,200,000	2,400,000		300,000	5,000,000
Revenue generated								4,100,000	12,700,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares													4.00	3.58	0.42
Business Acquisition Equity Interests Issued or Issuable Cash Per Share												$ 50.00