Acquired Credit Impaired Loans, Major Classifications of Acquired Credit Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	$ 1,225,892	$ 1,198,623
Loans, gross	1,221,725	1,194,577
Financial Asset Acquired with Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	9,038	10,802
Loans, gross	9,038	10,802
Financial Asset Acquired with Credit Deterioration [Member] | Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	817	922
Financial Asset Acquired with Credit Deterioration [Member] | Commercial, secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	5,032	6,315
Financial Asset Acquired with Credit Deterioration [Member] | Residential real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	2,881	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	308	336
First Capital Bancshares, Inc. [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	1,483	1,742
Loans, gross	1,483	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	7	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	800	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	676	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	2,371	3,170
Loans, gross	2,371	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	501	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	841	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	721	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	308	336
BNB Bancorp, Inc [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	1,346	1,554
Loans, gross	1,346	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	1,241	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	105	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	3,838	4,336
Loans, gross	3,838	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	309	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	2,150	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	1,379	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