Allowance for Loan Losses - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in the allowance for loan losses
Balance at the beginning of period	$ 35,606	$ 34,852	$ 35,907
Provision charged to operations	15,512	16,330	15,085
Loans charged off	(20,317)	(19,846)	(20,070)
Recoveries of loans previously charged off	4,768	4,270	3,930
Balance at the end of period	35,569	35,606	34,852
Real estate - residential mortgage
Changes in the allowance for loan losses
Balance at the beginning of period	2,313	2,355
Provision charged to operations	45	60
Loans charged off	(144)	(161)
Recoveries of loans previously charged off	257	59
Balance at the end of period	2,471	2,313	2,355
Real estate - construction
Changes in the allowance for loan losses
Balance at the beginning of period	434	434
Provision charged to operations	(340)
Balance at the end of period	94	434	434
Commercial, financial and agricultural
Changes in the allowance for loan losses
Balance at the beginning of period	7,744	7,805
Provision charged to operations	1
Loans charged off	(21)	(271)
Recoveries of loans previously charged off	31	210
Balance at the end of period	7,755	7,744	7,805
Equity lines
Changes in the allowance for loan losses
Balance at the beginning of period	812	892
Provision charged to operations	258
Loans charged off	(19)	(80)
Recoveries of loans previously charged off	1
Balance at the end of period	1,052	812	892
Consumer Loan
Changes in the allowance for loan losses
Balance at the beginning of period	211	273
Provision charged to operations	81
Loans charged off	(317)	(312)
Recoveries of loans previously charged off	268	250
Balance at the end of period	243	211	273
Consumer Finance
Changes in the allowance for loan losses
Balance at the beginning of period	24,092	23,093
Provision charged to operations	15,467	16,270
Loans charged off	(19,816)	(19,022)
Recoveries of loans previously charged off	4,211	3,751
Balance at the end of period	$ 23,954	$ 24,092	$ 23,093