Loans - Components of Purchased Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	$ 332,458	$ 333,880
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	332,321	333,816
Construction and land development [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	11,159	21,140
Commercial and Financial [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	40,503	36,633
Commercial Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	232,503	226,284
Residential Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	45,654	47,469
Other loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	0	0
Consumer Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	2,639	2,354
Purchased Credit Impaired [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	12,109	7,814
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	12,109	7,750
Purchased Credit Impaired [Member] | Construction and land development [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	114	1,557
Purchased Credit Impaired [Member] | Commercial and Financial [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,083	1,312
Purchased Credit Impaired [Member] | Commercial Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	9,990	4,092
Purchased Credit Impaired [Member] | Residential Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	922	851
Purchased Credit Impaired [Member] | Other loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	0	0
Purchased Credit Impaired [Member] | Consumer Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	0	2
Purchased Unimpaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	320,349	326,066
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	320,212	326,066
Purchased Unimpaired Loans [Member] | Construction and land development [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	11,045	19,583
Purchased Unimpaired Loans [Member] | Commercial and Financial [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	39,420	35,321
Purchased Unimpaired Loans [Member] | Commercial Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	222,513	222,192
Purchased Unimpaired Loans [Member] | Residential Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	44,732	46,618
Purchased Unimpaired Loans [Member] | Other loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	0	0
Purchased Unimpaired Loans [Member] | Consumer Loan [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	$ 2,639	$ 2,352