Fair Value Measurements, Assets and Liabilities on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Readily Available Market Prices [Member]
Loans
Agricultural	$ 0	$ 0
Commercial and financial	0	0
Real Estate [Abstract]
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Total financial instrument assets	417,033	370,550
Observable Market Prices [Member]
Loans
Agricultural	0	0
Commercial and financial	0	0
Real Estate [Abstract]
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Total financial instrument assets	259,756	258,625
Company Determined Market Prices [Member]
Loans
Agricultural	94,325	90,118
Commercial and financial	222,339	217,640
Real Estate [Abstract]
Construction, land development and commercial	100,695	107,276
Mortgage, farmland	240,554	239,521
Mortgage, 1 to 4 family first liens	887,278	896,676
Mortgage, 1 to 4 family junior liens	142,083	143,261
Mortgage, multi-family	353,963	349,663
Mortgage, commercial	402,564	395,838
Loans to individuals	32,244	32,722
Total financial instrument assets	2,611,521	2,603,233
Nonrecurring Basis [Member]
Loans
Agricultural	1,371	1,272
Commercial and financial	2,099	1,803
Real Estate [Abstract]
Construction, 1 to 4 family residential	0	0
Construction, land development and commercial	215	215
Mortgage, farmland	3,464	3,576
Mortgage, 1 to 4 family first liens	7,850	7,986
Mortgage, 1 to 4 family junior liens	189	49
Mortgage, multi-family	1,804	1,816
Mortgage, commercial	1,732	1,237
Loans to individuals	0	0
Foreclosed assets	0	0
Total financial instrument assets	18,724	17,954
Total Losses	93	1,038
Nonrecurring Basis [Member] \| Agricultural [Member]
Real Estate [Abstract]
Total Losses	0	36
Nonrecurring Basis [Member] \| Commercial and financial [Member]
Real Estate [Abstract]
Total Losses	0	499
Nonrecurring Basis [Member] \| Real Estate: Construction, 1 to 4 family residential [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] \| Real Estate: Construction, land development and commercial [Member]
Real Estate [Abstract]
Total Losses	0	8
Nonrecurring Basis [Member] \| Real Estate: Mortgage, farmland [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] \| Real Estate: Mortgage, 1 to 4 family first liens [Member]
Real Estate [Abstract]
Total Losses	93	370
Nonrecurring Basis [Member] \| Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] \| Real Estate: Mortgage, multi-family [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] \| Real Estate: Mortgage, commercial [Member]
Real Estate [Abstract]
Total Losses	0	125
Nonrecurring Basis [Member] \| Loans to individuals [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] \| Foreclosed assets [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] \| Readily Available Market Prices [Member]
Loans
Agricultural	0	0
Commercial and financial	0	0
Real Estate [Abstract]
Construction, 1 to 4 family residential	0	0
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Foreclosed assets	0	0
Total financial instrument assets	0	0
Nonrecurring Basis [Member] \| Observable Market Prices [Member]
Loans
Agricultural	0	0
Commercial and financial	0	0
Real Estate [Abstract]
Construction, 1 to 4 family residential	0	0
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Foreclosed assets	0	0
Total financial instrument assets	0	0
Nonrecurring Basis [Member] \| Company Determined Market Prices [Member]
Loans
Agricultural	1,371	1,272
Commercial and financial	2,099	1,803
Real Estate [Abstract]
Construction, 1 to 4 family residential	0	0
Construction, land development and commercial	215	215
Mortgage, farmland	3,464	3,576
Mortgage, 1 to 4 family first liens	7,850	7,986
Mortgage, 1 to 4 family junior liens	189	49
Mortgage, multi-family	1,804	1,816
Mortgage, commercial	1,732	1,237
Loans to individuals	0	0
Foreclosed assets	0	0
Total financial instrument assets	$ 18,724	$ 17,954

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents agricultural loans held as presented on the statement of financial position which are due the Company as of the balance sheet date.

No definition available.