Cash and Cash Equivalents Concentrations - Schedule of Amounts Due from Correspondent Institutions having Concentration of Credit Risk (Details) - Credit Concentration Risk - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Cash due from Correspondent institutions	$ 106,828	$ 64,329
First Tennessee Bank, N.A.
Concentration Risk [Line Items]
Cash due from Correspondent institutions	26,381	32,497
Federal Reserve Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	61,623	20,460
JP Morgan Chase
Concentration Risk [Line Items]
Cash due from Correspondent institutions	2,272	4,596
Fifth Third Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	1,598	879
Compass Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	987	684
Zions Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	501	500
Columbus Bank and Trust
Concentration Risk [Line Items]
Cash due from Correspondent institutions	1,062	444
Servis First Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	350	250
Sun Trust bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	232	232
PNC Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	213	219
First National Bankers Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	200	200
Federal Home Loan Bank of Cincinnati
Concentration Risk [Line Items]
Cash due from Correspondent institutions	$ 11,409	$ 3,368