Acquired Credit Impaired Loans, Major Classifications of Acquired Credit Impaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	$ 1,207,134	$ 1,198,623
Loans, gross	1,203,008	1,194,577
Financial Asset Acquired with Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	10,361	10,802
Loans, gross	10,354	10,802
Financial Asset Acquired with Credit Deterioration [Member] | Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	605	922
Financial Asset Acquired with Credit Deterioration [Member] | Commercial, secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	6,219	6,315
Financial Asset Acquired with Credit Deterioration [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	3,193	3,229
Financial Asset Acquired with Credit Deterioration [Member] | Other loans, including deposit overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	344	336
First Capital Bancshares, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	1,720	1,742
Loans, gross	1,720	1,742
First Capital Bancshares, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	11	13
First Capital Bancshares, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial, secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	809	818
First Capital Bancshares, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	900	911
First Capital Bancshares, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Other loans, including deposit overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	0	0
Eaton National Bank & Trust Co. [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	2,851	3,170
Loans, gross	2,851	3,170
Eaton National Bank & Trust Co. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	229	503
Eaton National Bank & Trust Co. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial, secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	1,513	1,547
Eaton National Bank & Trust Co. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	765	784
Eaton National Bank & Trust Co. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Other loans, including deposit overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	344	336
BNB Bancorp, Inc [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	1,527	1,554
Loans, gross	1,527	1,554
BNB Bancorp, Inc [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	0	0
BNB Bancorp, Inc [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial, secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	1,375	1,396
BNB Bancorp, Inc [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	152	158
BNB Bancorp, Inc [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Other loans, including deposit overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	0	0
Columbus First Bancorp, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	4,263	4,336
Loans, gross	4,256	4,336
Columbus First Bancorp, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	365	406
Columbus First Bancorp, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Commercial, secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	2,522	2,554
Columbus First Bancorp, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	1,376	1,376
Columbus First Bancorp, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Other loans, including deposit overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	$ 0	$ 0